Author: "Krneta Nikolić, Jelena D." - Searchworks@Jio Institute Digital Library Search Results

Your search keyword '"Krneta Nikolić, Jelena D."' showing total 216 results

Start Over Author "Krneta Nikolić, Jelena D."

216 results on '"Krneta Nikolić, Jelena D."'

1. Establishing control points scheme and baseline measurements for environmental radioactivity monitoring: A case study of the nuclear Institute

Author: Sarap, Nataša B., Janković, Marija M., Krneta Nikolić, Jelena D., Vukanac, Ivana S., and Rajačić, Milica M.
Published: 2024
Full Text: View/download PDF

2. Radionuclides’ content in forest ecosystem located in southwestern part of Serbia

Author: Hadrović Sabahudin H., Čeliković Igor T., Krneta-Nikolić Jelena D., Rajačić Milica M., and Todorović Dragana J.
Subjects: forest ecosystem, evergreen and deciduous trees, gamma-ray spectrometry, specific activity of 40k, 137cs and 210pb, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The results of the gamma-spectrometric measurements in a 16500 ha large region of south-western Serbia, are presented. Activity concentrations of 40K, 137Cs, and 210Pb in different deciduous and evergreen trees in the region are investigated. For all the investigated isotopes, there is a tendency that, on average, the lowest activity concentrations were found in tree stems, then in leaves, while the highest ones were in the soil. Statistical analysis did not show any differences between activity concentrations of leaves and needles, showing that both leaves and needles could be equally well used as a biomonitors.
Published: 2021
Full Text: View/download PDF

3. Radon and thoron exhalation rate measurements from building materials used in Serbia

Author: Čeliković Igor T., Pantelić Gordana K., Živanović Miloš Z., Vukanac Ivana S., Krneta Nikolić Jelena D., Kandić Aleksandar B., and Lončar Boris B.
Subjects: air exchange rate, building materials, radon exhalation rate, Science
Abstract: The second most important source of indoor radon, after soil beneath dwelling, is building material. With the increase in environmental awareness and new energy-saving policies, residents tend to replace the existing windows with tighter windows, which leads to a decrease in air exchange rate and consequently an increase in indoor radon concentration. In case of low exchange rates, dose caused by inhalation of radon and its progeny can exceed external dose originating from the radium content in the surrounding building material. In this paper, surface exhalation rates of radon (222Rn) and thoron (220Rn) from typical building materials used for construction and interior decoration of houses in Serbia were investigated. Surface exhalation rate measurements were performed using the closed-chamber method, while concentrations of radon and thoron in the chamber were continuously measured using an active device, RTM1688-2, produced by SARAD® GmbH. Finally, the impact of the replacement of windows on the indoor radon concentration was estimated.
Published: 2020
Full Text: View/download PDF

4. Assessment of radioactivity contribution and transfer characteristics of natural radionuclides in agroecosystem

Author: Sarap, Nataša B., Krneta Nikolić, Jelena D., Trifković, Jelena Đ., and Janković, Marija M.
Published: 2020
Full Text: View/download PDF

5. Assessment of natural radioactivity levels and radon exhalation rate potential from various building materials

Author: Vukanac Ivana S., Janković Marija M., Rajačić Milica M., Todorović Dragana J., Ujić Predrag N., Pantelić Gordana K., Sarap Nataša B., and Krneta-Nikolić Jelena D.
Subjects: natural radioactivity, radon exhalation rate, radiation hazard indice, building material, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Various imported building materials commonly used in construction and industry in Serbia were analyzed using gamma spectrometry. Based on the activity concentrations of 226Ra, 232Th, and 40K in the investigated samples, radium equivalent activity, Raeq, absorbed dose rate, D, annual effective dose, DE, and the external hazard index, Hex, were calculated to assess the radiation hazard for people. The Raeq for most of the analyzed samples (416 in total) was lower than the maximum admissible value of 370 Bqkg-1 set in the UNSCEAR report. The absorbed gamma dose rate in air was found to vary from 0.030 mGyh-1 to 1.328 mGyh-1 which in some cases exceeded indoor dose rates in Europe. The obtained values for annual effective dose exceed the limits of 0.41 mSv given in literature for about 5 % of measured samples, while values of Hex were higher than unity for three samples of cement, eight samples of granite, and one sand sample. As a possible source of elevated effective dose, the radon exhalation from building materials was estimated using the parameters given in literature. The internal dose due to 222Rn exhaled from the building material was found to be up to nine times higher than external dose due to 226Ra content in some cases. [Projects of the Serbian Ministry of Education, Science and Technological Development, Grant no. III43009 and Grant no. OI171018]
Published: 2020
Full Text: View/download PDF

6. Natural and artificial radioactivity in some protected areas of south east Europe

Author: Džoljić Jovana A., Stevović Svetlana M., Todorović Dragana J., Polavder Svetlana M., Rajačić Milica M., and Krneta-Nikolić Jelena D.
Subjects: gamma ray spectrometry, risk assessment, soil, Norway spruce, Kopaonik, Rila, Vlasina, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The primary aim of this research is the investigation of natural and artificial radioactivity in protected areas of Kopaonik, Vlasina, and Rila Mountains. Soil samples (including lake sediment), drinkable spring water and conifers at mentioned locations of Southeast Europe, are chosen as study objects due to their importance for people and the environment in global. Specific activities of 226Ra, 232Th, 40K, 238U, 235U, 137Cs, 210Pb, and 7Be are determined using gamma spectrometry and the obtained values compared with literature and mean world values. Risk assessment parameters and the soil-plant transfer factor were determined for 226Ra, 40K, 137Cs, and 210Pb. This is the first radioactivity study of high mountain areas of Vlasina and Kopaonik in Serbia and Rila in Bulgaria and as such a baseline measurement and foundation for future research. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III43009]
Published: 2017
Full Text: View/download PDF

7. Raspodela koncentracija aktivnosti prirodnih radionukida u uzorcima životne sredine kao posledica rada termoelektrane “Kolubara” u periodu 2010 – 2022. godine

Author: Vukašinović, Ivana, Todorović, Dragana, Krneta-Nikolić, Jelena D., Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Šćekić, Julija, Vukašinović, Ivana, Todorović, Dragana, Krneta-Nikolić, Jelena D., Rajačić, Milica, Janković, Marija M., Sarap, Nataša, and Šćekić, Julija
Abstract: Jedan od značajnih načina kontrole rada termoelektrana (TE) na ugalj je kontinuirano praćenje vrednosti koncentracija aktivnosti radionuklida prirodnog porekla sadržanih prvenstveno u uglju, a potom i uzorcima pepela i šljake kao glavnim produkatima sagorevanja uglja koje je zbog svoje obilne proizvodnje neophodno odlagati na deponije otpada. Koncentracije aktivnosti prirodnih radionuklida 238U, 235U, 226Ra, 210Pb, 232Th i 40K, koje bi u životnoj sredini potencijalno mogle biti preraspodeljene kao posledica rada TE, podležu redovnoj kontroli u uzorcima uglja, šljake, elektrofilterskog pepela, kao i u uzorcima sakupljenim sa deponija pepela, na aktivnoj i pasivnoj kaseti, i zemljištu uzorkovanom na manjoj i većoj udaljenosti od TE. Predmet ovoga rada je analiza rezultata višegodišnjih merenja obavljenih u periodu od 2010. do 2022. godine. Godišnje vrednosti koncentracija aktivnosti izmerene za svaki ispitivani radionuklid i svaku od sedam vrsta uzoraka posmatrane su kao hronološki nizovi podataka koji čine diskretne vremenske serije za koje su rezultati statističke analize ukazivali da se mogu opisati kao procesi tzv. belog šuma., One of the most important means of controlling the operation of coal-fired power plant (CFPP) is the continuous monitoring of naturally occurring activity concentrations of radionuclides contained primarily in coal and, consequently, in ash and slag samples, the main coal combustion products that must be disposed of in landfills due to their high production. The activity concentrations of the naturally occurring radionuclides 238U, 235U, 226Ra, 210Pb, 232Th, and 40K, which could potentially be released into the environment as a result of the CFPP operation, are regularly monitored in the samples of coal, slag, and fly ash, as well as in the samples of ash piles on the active and passive cassettes and in the soil sampled at lesser and greater distances from the CFPP. The aim of this work is to analyse the results of the multi-year activity concentration measurements carried out in the period from 2010 to 2022. The annual activity concentration values measured for each studied radionuclide and each of the seven sample types were observed as a chronological sequence of data forming discrete time series, which, according to the results of statistical analysis, may be described as white noise processes.
Published: 2023

8. Distribution of Natural Radionuclides and 137Cs in Urban Soil Samples from the City of Novi Sad, Serbia-Radiological Risk Assessment

Author: Janković, Marija M., Jelić, Ivana, Rajačić, Milica, Krneta-Nikolić, Jelena D., Vukanac, Ivana, Dimović, Slavko, Sarap, Nataša, Šljivić-Ivanović, Marija Z., Janković, Marija M., Jelić, Ivana, Rajačić, Milica, Krneta-Nikolić, Jelena D., Vukanac, Ivana, Dimović, Slavko, Sarap, Nataša, and Šljivić-Ivanović, Marija Z.
Abstract: This work presents the natural radioactivity distribution of 21 surface soil samples taken in the city of Novi Sad, Serbia. The analysis for radioactivity was performed using a gas low-level proportional counter for gross alpha and gross beta activity, while the specific activities of radionuclides were determined using HPGe detectors. The gross alpha activity of 20 samples was below the minimum detectable concentration (MDC), while in 1 sample it was 243 Bq kg−1; the gross beta activity ranged from the MDC (11 samples) to 566 Bq kg−1. The gamma spectrometry measurements showed naturally occurring radionuclides 226Ra, 232Th, 40K, and 238U in all investigated samples, with average values (Bq kg−1) of 33.9, 36.7, 513.8, and 34.7, respectively. Natural radionuclide 235U was detected in 18 samples with activity concentrations in the range of 1.3–4.1 Bq kg−1, while in the other 3 samples, the values were below the MDC. The artificial 137Cs radionuclide was detected in 90 percent of the samples, with a maximum value of 21 Bq kg−1, while the other artificial radionuclides were not detected. Based on the obtained concentrations of natural radionuclides, hazard indexes were estimated, and radiological health risk was assessed. The results present the absorbed gamma dose rate in the air, annual effective dose, radium equivalent activity, external hazard index, and lifetime cancer risk.
Published: 2023

9. Transfer factors for the „soil-cereals' system in the region of Pcinja, Serbia

Author: Marković Jelena S., Stevović Svetlana M., Rajačić Milica M., Todorović Dragana J., and Krneta-Nikolić Jelena D.
Subjects: transfer factor, natural radionuclide, 137Cs, soil, cereal, environment, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: The aim of the paper was to estimate the values of transfer factors for natural radionuclides (40K, 226Ra, 232Th, 235U, and 238U) and 137Cs from soil to plants (cereals: wheat, corn and barley) as important parameters for the agricultures in the selection of the location and the sort of cereals to be planted on. The results presented in this paper refer to the „soil-cereals” system in the region of Pcinja, Serbia. Total of 9 samples of soil and 7 samples of cereals were measured in the Department of Radiation and Environmental Protection, Vinca Institute of Nuclear Sciences, using three high-purity germanium detectors for gamma spectrometry measurements. In all the samples, transfer factors for 226Ra are significantly lower than for 40K, but they are all in good agreement with the literature data. On the three investigated locations, the calculated values of transfer factors for 40K were in the range of 0.144 to 0.392, while in the case of 226Ra, the transfer factors ranged from 0.008 to 0.074. Only one value (0.051) was obtained for transfer factor of 232Th. Specific activities of 137Cs, as well as uranium isotopes, in all the investigated cereal samples, were below minimal detectable activity concentrations. Also, the absorbed dose rate and the annual absorbed dose from the natural radionuclides in the soil, were calculated. The absorbed dose rate ranged from 49-86 nSv/h, while the annual absorbed dose ranged from 0.061-0.105 mSv. The measurements presented in this manuscript are the first to be conducted in the region of Pcinja, thus providing the results that can be used as a baseline for future measurements and monitoring.
Published: 2016
Full Text: View/download PDF

10. Natural radioactivity level in materials used for medieval vaulting in the territory of the central Balkan region

Author: Bjelić Igor S., Todorović Dragana J., Krneta-Nikolić Jelena D., Lazarević Đorđe R., and Stanković Koviljka Đ.
Subjects: natural radioactivity, building material, medieval vault, Balkan, gamma ray spectrometry, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: This work presents the results of an investigation undertaken to determine the level of natural radioactivity in the traditional building materials used for medieval indoor vaulted constructions in the territory of the central Balkan region. Indoor radiation exposure varies appreciably if it comes from the earth building materials, hence the presence of natural radioisotopes of 226Ra, 232Th, and 40K in masonry vaulted constructions was analyzed using gamma ray spectrometry. In addition, the internal health hazard index, the absorbed dose rates and the effective annual doses were calculated. The results were then compared both with the reported data from the previous studies concerning the territory of the Balkan Peninsula, as well as with the worldwide values for the materials of historic buildings. The results obtained from the materials examined in this paper all showed the radioactivity levels below the maximum permitted values. [Projekat Ministarstva nauke Republike Srbije, br. 171007 i br. 43009]
Published: 2016
Full Text: View/download PDF

11. Radon measurements with charcoal canisters temperature and humidity considerations

Author: Živanović Miloš Z., Pantelić Gordana K., Krneta-Nikolić Jelena D., Rajačić Milica M., and Todorović Dragana J.
Subjects: radon, charcoal canister, mass gain, humidity, calibration factor, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract: Radon testing by using open-faced charcoal canisters is a cheap and fast screening method. Many laboratories perform the sampling and measurements according to the United States Environmental Protection Agency method - EPA 520. According to this method, no corrections for temperature are applied and corrections for humidity are based on canister mass gain. The EPA method is practiced in the Vinča Institute of Nuclear Sciences with recycled canisters. In the course of measurements, it was established that the mass gain of the recycled canisters differs from mass gain measured by Environmental Protection Agency in an active atmosphere. In order to quantify and correct these discrepancies, in the laboratory, canisters were exposed for periods of 3 and 4 days between February 2015 and December 2015. Temperature and humidity were monitored continuously and mass gain measured. No significant correlation between mass gain and temperature was found. Based on Environmental Protection Agency calibration data, functional dependence of mass gain on humidity was determined, yielding Environmental Protection Agency mass gain curves. The results of mass gain measurements of recycled canisters were plotted against these curves and a discrepancy confirmed. After correcting the independent variable in the curve equation and calculating the corrected mass gain for recycled canisters, the agreement between measured mass gain and Environmental Protection Agency mass gain curves was attained. [Projekat Ministarstva nauke Republike Srbije, br. III43009: New Technologies for Monitoring and Protection of Environment from Harmful Chemical Substances and Radiation Impact]
Published: 2016
Full Text: View/download PDF

12. Outdoor Radon as a Tool to Estimate Radon Priority Areas—A Literature Overview

Author: Čeliković, Igor T., Pantelić, Gordana K., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Živanović, Miloš Z., Cinelli, Giorgia, Gruber, Valeria, Baumann, Sebastian, Quindos Poncela, Luis Santiago, Rabago, Daniel, Čeliković, Igor T., Pantelić, Gordana K., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Živanović, Miloš Z., Cinelli, Giorgia, Gruber, Valeria, Baumann, Sebastian, Quindos Poncela, Luis Santiago, and Rabago, Daniel
Abstract: Doses from the exposure to outdoor radon are typically an order of magnitude smaller than those from indoor radon, causing a greater interest on investigation of the latter for radiation protection issues. As a consequence, assessment of radon priority areas (RPA) is mainly based on indoor radon measurements. Outdoor radon measurements might be needed to guarantee a complete estimation of radiological risk and may help to improve the estimation of RPA. Therefore, authors have analysed the available literature on outdoor radon to give an overview of outdoor radon surveys and potential correlation with indoor radon and estimation of RPA. The review has shown that outdoor radon surveys were performed at much smaller scale compared to indoor radon. Only a few outdoor radon maps were produced, with a much smaller density, covering a larger area, and therefore putting doubt on the representativeness of this data. Due to a large variety of techniques used for outdoor radon measurements and requirement to have detectors with a high sensitivity and resistance to harsh environmental conditions, a standardised measurement protocol should be derived. This is no simple endeavour since there are more applications in different scientific disciplines for outdoor radon measurements compared to indoor radon.
Published: 2022

13. Radioactivity of fungi in schist-type soil in the Stara Planina mountain ecosystem

Author: Radenković, Mirjana, Božić, Gavrilo, Krneta-Nikolić, Jelena D., Topalović, Dušan, Radmanović, Svjetlana, Radenković, Mirjana, Božić, Gavrilo, Krneta-Nikolić, Jelena D., Topalović, Dušan, and Radmanović, Svjetlana
Abstract: Mountain ecosystems are going through changes due to numerous physical-chemical processes in the environment rather than the anthropogenic activities. Primordial radioactivity of rock and soil material migrates and fractionates in other environmental sections like waters, air and biota. Having a feature to accumulate different minerals and trace element present in soil and three substrates, fungi indicates their composition and related processes. The aim of this study is uptake of radionuclides by fungi in the schist soil of the Stara Planina, mountain famous for biodiversity as well as for enhanced natural radioactivity areas. Samples of various fungi species (stipes and cups) and their soil substrates have been collected in summer season 2019. Collected soil samples are pedologically characterized and analysed by gamma-spectrometry (HP Ge) after the secular radioactive equilibrium had been reached. Soil characterization has shown the share of coarse fragments, sand, silt and clay in the schist (shale) structure while pH value was 4.80-5.33 and organic carbon content 3.10%. The content of significant natural radionuclides 40K, 226Ra, 232Th, 238U and manmade 137Cs was (in Bq/kg) was 500±30, 27±2, 26±2, 32±4, 1.6±0.2 respectively. Dried fungi samples were analysed by gamma spectrometry showing the natural radionuclide content in wide range of values. Obtained results indicate dependence of the radionuclides uptake from the substrate on their abundance in schist soil type as well as the fungus specie physiology. Slight difference was observed in results between content in species with different types of nutrient uptake (mycorrhizal and saprobic). The 137Cs content varied from 2-20 Bq/kg. Further knowledge on the local population habits in use of edible fungi species would enable dose assessment for the representatives of the public and contribute to a further research on the Stara Planina mountain ecosystem.
Published: 2022

14. Determination of indoor radon concentration and radon concentration in soil: Regional Interlaboratory Comparison – RADON2021

Author: Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš, Krneta-Nikolić, Jelena D., Zekić, Ranko, Svrkota, Nikola, Forkapić, Sofija, Predojević, Branko, Pavičar, Bojan, Arsić, Vesna, Vukanac, Ivana, Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš, Krneta-Nikolić, Jelena D., Zekić, Ranko, Svrkota, Nikola, Forkapić, Sofija, Predojević, Branko, Pavičar, Bojan, Arsić, Vesna, and Vukanac, Ivana
Abstract: In accordance with ISO/IC 17025:2017 testing laboratory shall have a procedure for monitoring the validity of results that includes regular participation in interlaboratory comparisons. Interlaboratory comparison RADON2021 was organized in the frame of the bilateral project between Serbia and Montenegro: “Measurement of the radon equilibrium factor in typical residential buildings in Serbia and Montenegro and harmonization of radon measurement techniques” in order to assess congruence of different measurement techniques, and then harmonize methods in case of inconsistencies. Harmonization is of particular importance to neighboring countries, in order to avoid inconsistencies in the classification of radon risk zones along border areas. Thus, six regional laboratories took part in the intercomparison – three from Belgrade and one from Novi Sad, Serbia; one from Podgorica, Montenegro; one from Banja Luka, Bosnia and Herzegovina. All laboratories participated in the indoor radon measurements, while 4 laboratories measured radon in the soil also. The measurement methods and detectors used by the laboratories were: • for air - EPA 402-R-92-004 – Indoor Radon and Radon Decay Product Measurement Devices Protocols, ch. 3.1. with RAD 7, RTM1688-2 and RadonEye; EPA 520/5-87-005 – 1987 EERF Standard Operating Procedures for Rn-222 Measurement Using Charcoal Canisters, ch. 3.4 using adsorption on charcoal canisters; ISO 11665- 4: Measurement of radioactivity in the environment – Air Radon 222: Part 4: Integrated measurement method for determining average activity concentration using passive sampling and delayed analysis with Electretes, and • for soil gas - ISO 11665-11:2016 Measurement of radioactivity in the environment — Air: radon-222 — Part 11: Test method for soil gas with sampling at depth by using active devices RTM1688-2 and RAD 7. The measurements were performed in real conditions where the radon concentration varied following a typical daily variation. Indoor radon c
Published: 2022

15. Overview of Radon Flux Characteristics, Measurements, Models and Its Potential Use for the Estimation of Radon Priority Areas

Author: Čeliković, Igor T., Pantelić, Gordana K., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Živanović, Miloš Z., Cinelli, Giorgia, Gruber, Valeria, Baumann, Sebastian, Ciotoli, Giancarlo, Poncela, Luis Santiago Quindos, Rabago, Daniel, Čeliković, Igor T., Pantelić, Gordana K., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Živanović, Miloš Z., Cinelli, Giorgia, Gruber, Valeria, Baumann, Sebastian, Ciotoli, Giancarlo, Poncela, Luis Santiago Quindos, and Rabago, Daniel
Abstract: Radon flux measurements provide information about how much radon rises from the ground toward the atmosphere, thus, they could serve as good predictors of indoor radon concentrations. Although there are many different mapping methods with many different input data, radon flux data are generally missing and are not included for the delineation of radon priority areas (RPA). The aim of this literature review is to investigate to what extent radon flux was used, or could be used, for the delineation of RPAs. Numerous factors influencing radon flux were identified, but quantifying their contribution to radon flux measurement still remains a challenge. Different methods and measuring devices were used for the determination of radon flux, thus it is necessary to identify possible inconsistencies in order to harmonise different radon flux measurements. Due to the complexity of radon flux measurements, only two countries were identified to have performed national surveys on outdoor radon, which were of much smaller scale compared to those on indoor radon. A positive correlation between radon flux and radon quantities, such as radon in soil gas and indoor radon, indicates that radon flux could be used as an input parameter for the estimation of RPA. By reviewing radon flux models, it was concluded that up-to-date modelled radon flux maps have reached excellent spatial resolution and will be further improved, hence, they could serve as an input for the estimation and delineation of RPA.
Published: 2022

16. Efekti svojstava tla različitih poljoprivrednih koncepata na migraciju antropogenih radionuklida

Author: Sarap, Nataša, Janković, Marija M., Rajačić, Milica, Krneta-Nikolić, Jelena D., Todorović, Dragana, Vukanac, Ivana, and Pantelić, Gordana K.
Abstract: Istraživanja obuhvaćena ovom studijom predstavljaju prikaz efekata svojstava tla različitih poljoprivrednih koncepata na migraciju antropogenih radionuklida, 90Sr i 137Cs. Za potrebe ovog rada, izvršeno je uzorkovanje obradivog zemljišta na dve dubine na teritoriji grada Beograda tokom 2014. godine. U uzorcima zemljišta su određene fizičko−hemijske osobine i specifične aktivnosti ispitanih radionuklida. Radiohemijska analitička metoda je primenjena za određivanje sadržaja 90Sr, dok je specifična aktivnost 137Cs određena primenom gamaspektrometrijske metode. Ispitivanje efekata svojstava analiziranih uzoraka obradivog zemljišta na migraciju 90Sr i 137Cs, izvršeno je statističkim metodama analize. Primenom linearne korelacione analize utvrđeni su dominantni fizičko−hemijski parametri koji utiču na migraciju 90Sr i 137Cs u poljoprivrednom zemljištu. The research included by this study presents the effects of soil properties of different agricultural concepts to the migration of anthropogenic radionuclides, 90Sr and 137Cs. For the purposes of this paper, sampling of agricultural soil at two depths on the territory of the city of Belgrade during 2014 was performed. The physico−chemical properties of investigated soil, as well as the specific activities of the mentioned radionuclides were determined. The radiochemical analytical method was used to determine the 90Sr content, while the specific activity of 137Cs was determined using the gamma spectrometric method. Examination of the effects of soil properties on the migration of anthropogenic radionuclides 90Sr and 137Cs, based on the analyzed soil samples, was performed by statistical methods of analysis. By applying linear correlation analysis, the dominant physico−chemical parameters that affect the migration of 90Sr and 137Cs in agricultural soil were determined. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

17. Sistematsko ispitivanje koncentracije radona na teritoriji Beograda

Author: Rajačić, Milica, Todorović, Dragana, Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Vukanac, Ivana, Janković, Marija M., and Sarap, Nataša
Abstract: Programom sistematskog ispitivanja nivoa radioaktivnosti u životnoj sredini na teritoriji Beograda predviđeno je merenje koncentracije radona (222Rn) u stambenim objektima, školskim i predškolskim ustanovama. Laboratorija "Zaštita", Instituta za nuklearne nauke "Vinča" je u periodu 2016-2020. izvršila ispitivanja u 547 prostorija (99 u stambenim objektima, 341 u školskim ustanovama i 107 u predškolskim jedinicama). Prosečna koncentracija 222Rn je iznosila 105 Bq/m3, a koncentarcija ispod 100 Bq/m3 je izmerena u 76,60 % prostorija. Vrednost od 400 Bq/m3 je prekoračena u 4,94 % prostorija. Od 15 beogradskih opština, koliko je pokriveno ovim istraživanjem, u 8 je detektovana koncentracija iznad 400 Bq/m3. Maksimalna izmerena vrednost u stambenim objektima je iznosila 3550 Bq/m3, dok je u vaspitno-obrazovnim ustanovama najveća detektovana koncentracija bila 1910 Bq/m3. The program of the level of radioactivity in the environment monitoring on the territory of Belgrade envisages measuring the concentration of radon in residential buildings, schools and kindergartens. The Department of Radiation and Environmental Protection of the Institute of Nuclear Sciences "Vinca" conducted examination in 547 rooms (99 in residential buildings, 341 in schools and 107 in kindergartens) in the period 2016-2020. The average concentration of 222Rn is 105 Bq/m3, and the concentration below 100 Bq/m3 was measured in 76.60 % of the rooms. The value of 400 Bq/m3 was exceeded in 4.94 % of the rooms. Out of 15 Belgrade municipalities covered by this research, a concentration above 400 Bq/m3 was detected in 8 municipalities. The maximum measured value in residential buildings was 3550 Bq/m3, while in educational institutions the highest detected concentration was 1910 Bq/m3. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

18. TraceRADON - метрологија радона у области изучавања климатских промена и у заштити од зрачења у животној средини

Author: Pantelić, Gordana K., Čeliković, Igor T., Vukanac, Ivana, Krneta-Nikolić, Jelena D., and Živanović, Miloš Z.
Abstract: Пројекат TraceRADON у оквиру програма EMPIR је фокусиран на метрологију радонa у области изучавања климатских промена и у заштити од зрачења у животној средини. Циљеви пројекта TraceRADON су: повећање тачности мере- ња у заштити од зрачења и оних која се користе за моделовање код климатских промена, следљивост до СИ јединица за ексхалације радона из земљишта, његову концентрацију у атмосфери и валидацију модела за његову дисперзију; развој след- љивих метода за мерење ниских концентрација радона у спољашњој средини у опсегу од 1 Bq/m3 дo 100 Bq/m3 са мерном несигурношћу реда 10 % (k=1) које се користе у мониторингу климатских промена и у заштити од зрачења; развој следљивих мерења флукса радона на терену, на основу развоја референтног система за ексхалацију радона „exhalation bed“ и стандард трансфера; хармонизација постојећих инструмената/метода за мерење флукса радона користећи интеркомпарацију; валидација постојећих модела и прикупљених података флукса радона, користећи следљива мерења флукса радона и концен- трације радона подржане дозиметријским и спектрометријским подацима из мрежа за рану најаву нуклеарне опасности у Европи. У овом раду ће бити дат преглед циљева и досадашњих резултата пројекта. TraceRADON, a three year project based in the EMPIR program, is focused on radon metrology for use in climate change observation and radiation protection at the environmental level. The aims of project TraceRADON are: to increase the accuracy of both radiation protection measurements and those used for GHG modeling, traceability to SI units for radon release rates from soil, its concentration in the atmosphere and validated models for its dispersal; to develop traceable methods for the measurement of outdoor low-level radon activity concentrations in the range of 1 Bq/m3 to 100 Bq/m3 with uncertainties of 10 % (k=1) to be used in climate and radiation protection networks; to develop the capability for traceable radon flux measurements in the field, based on the development of a radon exhalation reference system “exhalation bed” and a transfer standard; to use this capability to harmonize existing radon flux instruments/methods using intercomparisons and to validate current radon flux models and inventories using traceable measurements of radon flux and radon activity concentration supported by dosimetric and spectrometric data from the radiological early warning networks in Europe. This paper presents the overview of these objectives and the results achieved in the present time. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

19. Merna nesigurnost gama indeksa za građevinski materijal – zakonska regulativa u praksi

Author: Krneta-Nikolić, Jelena D., Rajačić, Milica, Vukanac, Ivana, Todorović, Dragana, Pantelić, Gordana K., Sarap, Nataša, and Janković, Marija M.
Abstract: Na osnovu člana 15 Pravilnika o granicama sadržaja radionuklida u vodi za piće, životnim namirnicama, stočnoj hrani, lekovima, predmetima opšte upotrebe, građevinskom materijalu i drugoj robi koja se stavlja u promet (Sl. glasnik 36/18), da bi se obezbedilo da izlaganje stanovništva zračenju koje potiče od građevinskog materijala ne pređe referentni nivo od 1 mSv godišnje, propisano je određivanje gama indeksa I. Ovaj gama indeks se računa tako što se izmerene koncentracije prirodnih radionuklida 226Ra, 232Th i 40K podele odgovarajućim izvedenim koncentracijama. Zbir ovih količnika ne sme da bude veći od 1. S obzirom na to da se izmerene koncentracije radionuklida definišu sa pripadajućom mernom nesigurnošću, i gama indeks treba da bude iskazan sa svojom pripadajućom mernom nesigurnosti. U ovom radu biće definisana merna nesigurnost gama indeksa I i diskutovano pravilo odlučivanja koje bi trebalo primeniti kako bi se ustanovilo da li ovako određen gama indeks zadovoljava zahteve pomenutog Pravilnika. Based on the Article 15 of the Roolebook on the limits of the radionuclide content in drinking water, foodstuffs, feedstuffs, medicines, objects of general use, building materials and other goods that are put on market (Official Gazette RS. 36/18), to ensure that the exposure of the general population, originating from the building material do not exceed 1 mSv per year, the calculation of the gamma index I is required. This index is obtained by dividing measured activity concentrations of naturally occurring radionuclides 226Ra, 232Th and 40K with the appropriate derived concentrations. The sum of these quotents should not exceed 1. Taking into account that the activity concentrations are defined with the appropriate measurement uncertainty, gamma index I should also be stated with its appropriate measurement uncertainty. In this paper, the measurement uncertaitny of the gamma index I will be defined and the decission rule for compliance of thus obtained gamma index with the Rulebook 36/18 discussed. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

20. Sadržaj radionuklida u izvorskim vodama u okolini Smederevske Palanke

Author: Janković, Marija M., Rajačić, Milica, Krneta-Nikolić, Jelena D., Vukanac, Ivana, Todorović, Dragana, Pantelić, Gordana K., and Sarap, Nataša
Abstract: U radu su prikazani rezultati merenja radioaktivnosti u izvorskim vodama u okolini Smederevske Palanke. Određivanje sadržaja radionuklida urađeno je gamaspektrometrijskom metodom sa HPGe detektorom, dok je za merenje ukupne alfa i ukupne beta aktivnosti u uzorcima korišćen gasni proporcionalni alfa beta brojač THERMO-EBERLINE FHT 770T. Uzorci su sakupljani tokom proleća 2021. godine. Dobijeni rezultati upoređeni su sa dozvoljenim vrednostima sadržaja radionuklida u vodi za piće propisanim Zakonskom regulativom. The results of gamma spectrometric analysis and determination of gross alpha and gross beta activity in spring waters in the vicinity of Smederevska Palanka are presented in this paper. Determination of radionuclide content was performed with HPGe gamma spectrometry, while determination of gross alpha and gross beta activity was performed using gas proportional alpha/beta counter THERMO-EBERLINE FHT 770T. Samples were collected in spring of 2021. The obtained results were compared with the permitted values of radionuclide content in drinking water prescribed by the Legislation. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

21. Radioaktivnost okoline u procesu iskopavanja bunara - selo Poganovo

Author: Todorović, Dragana, Rajačić, Milica, Krneta-Nikolić, Jelena D., Janković, Marija M., Vukanac, Ivana, Pantelić, Gordana K., and Sarap, Nataša
Abstract: Rezultati merenja radioaktivnosti zemljišta, mulja i vode u procesu iskopavanja bunara do maksimalne dubine od 13,5 m u selu Poganovu, u opštini Dimitrovgrad, prikazani su u ovom radu. Uzorci mulja i zemljišta, analizirani su spektrometrijom gama emitera i određivanjem sadržaja 90Sr. U slučaju uzorka vode, određena je ukupna alfa i ukupna beta aktivnost, i koncentracija radionuklida gama emitera. Pored navedenih uzoraka, sa iste lokacije su mereni i uzorci mahovina i lišajeva. Osim u uzorku mahovine i zemljišta sa dubine 0-10 cm u kojima je detektovano prisustvo 137Cs u veoma niskim koncentracijama za ovu vrstu uzoraka, ni u jednom uzorku nije detektovano prisustvo proizvedenih radionuklida, 137Cs i 90Sr. U slučaju prirodnih radionuklida, dobijene vrednosti koncentracija, karakteristične su za ovakve vrste uzoraka i ne razlikuju se u odnosu na druge lokacije na našim prostorima. Svi rezultati merenja ukazuju na to da se ova lokacija može koristiti kao nulta tačka monitoringa radioaktivnosti na našim prostorima. The results of radioactivity measurements in the soil, sludge and water samples in the process of finding water and digging wells to a maximum depth of 13.5 m, in the village of Poganovo, in the municipality of Dimitrovgrad, are presented in this paper. Sludge and soil samples were analyzed by gamma-ray spectrometry and 90Sr measurements. In the case of water samples, gross alpha and gross beta activity, as well as content of radionuclides gamma emitter were determined. In addition, samples of mosses and lichens from the same location were also measured. Presence of the artificial radionuclides 90Sr and 137Cs were not detected in measured samples, with an exception of the sample of moss and soil from a depth of 0-10 cm, where 137Cs was detected in very low concentrations for this type of samples. In the case of natural radionuclides, the obtained values of concentrations are characteristic of these types of samples and do not differ from other locations in our area. All measurement results indicate that this location can be used as a zero point for monitoring radioactivity in our area. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

22. Radonski ravnotežni faktor u izabranim rezidencijalnim i radnim objektima u Srbiji i Crnoj Gori

Author: Čeliković, Igor T., Zekić, Ranko, Svrkota, Nikola, Vukanac, Ivana, Živanović, Miloš Z., Krneta-Nikolić, Jelena D., Vukotić, Perko, and Pantelić, Gordana K.
Abstract: U radu su prikazani rezultati merenja radonskog ravnotežnog faktora aktivnom metodom na 5 lokacija u Crnoj Gori i Srbiji. Dobijeni rezultati su u rasponu od 0.36 do 0.7, što je u proseku veće od preporučene vrednosti od 0.4. Na istim lokacijama su izvršena interkomparativna merenja koncentracije radona (uređajima Alpha Guard Pro, RAD7 i RTM1688-2), ravnotežne ekvivalentne koncentracije radona (uređajima RNWL i RPM2200) i radonskog ravnotežnog faktora. Slaganje rezultata je testirano Z-testom koji ukazuje da ne postoji statistički značajno odstupanje između rezultata dobijenih različitim mernim uređajima, odnosno ne postoji nekonzistentnost između različitih metodologija merenja kao ni potrebe za harmonizacijom različitih procedura merenja. In this contribution, the results of radon equilibrium factor measurement in selected dwelling and workplaces in Montenegro and Serbia are presented. Radon equilibrium factor was derived from measurements of indoor radon concentration and equilibrium equivalent radon concentration. Measurements were performed one day for each of 5 locations by using different active devices. Obtained radon equilibrium factors range from 0.36 to 0.7 which is in average larger than worldwide average of 0.4 Results are not surprising since measuring locations were kept closed during the measuring time, reducing therefore ventilation rate which as a consequence has an increase of equilibrium factor. Individual measuring results of indoor radon concentrations, equilibrium equivalent radon concentrations and radon equilibrium factors obtained with different detectors systems from 2 research teams was tested using Z – test. Obtained Z – score for each measurement vas below critical value, indication that there is no statistical difference between different measuring devices. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

23. Ispitivanje aktivnosti radionuklida u otpadnom materijalu – budžet merne nesigurnosti

Author: Vukanac, Ivana, Rajačić, Milica, Andrić, Velibor, Krneta-Nikolić, Jelena D., Todorović, Dragana, Pantelić, Gordana K., and Janković, Marija M.
Abstract: Prema važećoj zakonskoj regulativi u Republici Srbiji kontrola radiološke ispravnosti otpadnih materijala vrši se na graničnim prelazima, kao i kada postoji namera odlaganja u životnu sredinu. Sadržaj radionuklida u otpadnim materijalima u najvećem broju slučajeva odredjuje se gamaspektrometrijskim ispitivanjem. Ova merenja podrazumevaju adekvatnu pripremu uzorka u cilju postizanja željene geometrije merenja za koju je izvršena kalibracija efikasnosti gama spektrometra. U postupku pripreme uzorka otpadnog materijala često nije moguće postići zadovoljavajuću homogenost. Takodje, matriks merenog materijala u većini slučajeva ne odgovara matriksu standarda pomoću kojeg je izvršena kalibracija spektrometra. Iz ovih razloga je potrebno izvršiti odredjene korekcije rezultata merenja (transfer efikasnosti, na pr.), kao i proširenje budžeta merne nesigurnosti. U radu je detaljno prikazan postupak procene doprinosa nehomogenosti uzorka mernoj nesigurnosti, kao i doprinosa koji u budžet merne nesigurnosti unosi transfer efikasnosti i primena korekcionih faktora za koincidentno sumiranje. According to the current legislation in the Republic of Serbia, the radiological control of waste materials is performed at border crossings, as well as when there is an intention to dispose these materials in the environment. The gamma ray spectrometry is commonly used for determination of radionuclide content in waste materials. These measurements imply adequate sample preparation in order to achieve the desired measurement geometry for which the efficiency of the gamma spectrometer has been calibrated. Satisfactory homogeneity is often not possible to achieve in the sample preparation process. Also, the matrix of the measured material in most cases does not correspond to the matrix of the standard used for efficiency calibration of the spectrometer. For these reasons, it is necessary to make certain corrections to the measurement results (efficiency transfer, for example), as well as to expand the measurement uncertainty budget. The paper presents in detail the procedure for assessing the contribution of inhomogeneity of the sample to the measurement uncertainty, as well as the contribution that the efficiency transfer and coincidence summing corrections introduce to the measurement uncertainty budget. XXXI Симпозијум Друштва за заштиту од зрачења Србије и Црне Горе, 06-08. октобар 2021. Proceedings: [https://vinar.vin.bg.ac.rs/handle/123456789/9668]
Published: 2021

24. Radionuclides’ content in forest ecosystem located in southwestern part of Serbia

Author: Hadrović, Sabahudin H., Čeliković, Igor T., Krneta-Nikolić, Jelena D., Rajačić, Milica, Todorović, Dragana, Hadrović, Sabahudin H., Čeliković, Igor T., Krneta-Nikolić, Jelena D., Rajačić, Milica, and Todorović, Dragana
Abstract: The results of the gamma-spectrometric measurements in a 16500 ha large region of south-western Serbia, are presented. Activity concentrations of 40K, 137Cs, and 210Pb in different deciduous and evergreen trees in the region are investigated. For all the investigated isotopes, there is a tendency that, on average, the lowest activity concentrations were found in tree stems, then in leaves, while the highest ones were in the soil. Statistical analysis did not show any differences between activity concentrations of leaves and needles, showing that both leaves and needles could be equally well used as a biomonitors.
Published: 2021

25. Characteristics of radioactivity in the surface air along the 45°N zonal belt in South-Eastern Europe

Author: Ajtić, Jelena V., Zorko, Benjamin, Nečemer, Marijan, Sarvan, Darko Z., Rajačić, Milica, Krneta-Nikolić, Jelena D., Todorović, Dragana, Đurđević, Vladimir S., Vodenik, Branko, Glavič-Cindro, Denis, Kožar Logar, Jasmina Koar, Ajtić, Jelena V., Zorko, Benjamin, Nečemer, Marijan, Sarvan, Darko Z., Rajačić, Milica, Krneta-Nikolić, Jelena D., Todorović, Dragana, Đurđević, Vladimir S., Vodenik, Branko, Glavič-Cindro, Denis, and Kožar Logar, Jasmina Koar
Abstract: This study investigates the beryllium-7, lead-210 and caesium-137 activity concentrations in aerosol filter samples collected monthly along the 45°N zonal belt over 1991–2019. Sampling was performed in three locations, one in Serbia and two in Slovenia, and the Slovenian data records are published here for the first time. The activity concentrations were determined by standard gamma spectrometry. The obtained results are in general agreement with the literature data for Europe. The data sets at different sites display similarities in measurement ranges, overall means and seasonal cycles. Still, statistical tests show significant differences among the radionuclides’ concentrations across the locations. To investigate underlying processes that affect radioactivity in the surface air in this region, multivariate statistical concepts are applied to the radionuclides’ concentrations and local meteorological parameters. Discriminant analysis shows that all three sites are well separated from each other. Principal component analysis gives common pattern of interconnection between the observables: temperature has a stronger influence on the behaviour of beryllium-7 and lead-210 than that of caesium-137, but a negative correlation of the radionuclides’ concentrations with precipitation seems the strongest for caesium-137. Principal component analysis also shows local differences in the degree of relationship between the meteorological parameters and activity concentrations of the investigated radionuclides. This is an important finding for future atmospheric transport studies.
Published: 2021

26. Technical and radiological characterisation of fly ash and bottom ash from thermal power plant

Author: Fidanchevska, Emilija, Angjusheva, Biljana, Jovanov, Vojo, Murtanovski, Pece, Vladiceska, Ljubica, Stamatovska Aluloska, Nikolina, Krneta-Nikolić, Jelena D., Ipavec, Andrej, Šter, Katarina, Mrak, Maruša, Dolenec, Sabina, Fidanchevska, Emilija, Angjusheva, Biljana, Jovanov, Vojo, Murtanovski, Pece, Vladiceska, Ljubica, Stamatovska Aluloska, Nikolina, Krneta-Nikolić, Jelena D., Ipavec, Andrej, Šter, Katarina, Mrak, Maruša, and Dolenec, Sabina
Abstract: Huge quantities of fly ash and bottom ash are generated from thermal power plants and it presents great concern for country, mainly due to the environmental effects. In this study, fly ashes and bottom ash were characterized from technical and radiological aspects. Health effect due to the activity of radionuclides 226Ra, 232Th and 40K was estimated via radium equivalent activity (Raeq), external hazards index (Hex), the external absorbed dose rate (D) and annual effective dose rate (EDR). The specific surface area (40.25 m2 g−1), particle density (1.88 g cm−3) and LOI (23.49%) were typical for bottom ash. Siliceous fly ash contained 32% reactive silica. The annual effective dose rate for all ashes is ≤ 0.2 mSv y−1. Both, fly ash and bottom ash present potential secondary raw materials to be used for building purposes as result of their technological and radiological assessment.
Published: 2021

27. Preparation and validation of laboratory radioactive standards for experimental calibration in gamma ray spectrometry

Author: Vukanac, Ivana, Đurašević, Mirjana M., Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, Vukanac, Ivana, Đurašević, Mirjana M., Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Rajačić, Milica, Janković, Marija M., Sarap, Nataša, and Todorović, Dragana
Abstract: The procedure of radioactive standards preparation by spiking selected matrices with a certified mixture of radionuclides and its validation is presented in this paper. The uncertainty budget of standard total activity was elaborated in details. The experimentally obtained efficiency curves, as well as comparison with the curves obtained by the efficiency transfer, are presented. Additionally, in order to confirm claimed homogeneity of prepared standard bulk materials, the efficiency versus density dependence for the individual gamma ray energies was checked for the same geometries and the results are presented. The results of the participation in recent IAEA PT scheme are discussed also. © 2021 Elsevier Ltd
Published: 2021

28. Comparison of indoor radon measurement methods

Author: Vukanac, Ivana, Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš, Krneta-Nikolić, Jelena D., Vukanac, Ivana, Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš, and Krneta-Nikolić, Jelena D.
Abstract: Radon is the radioactive gas originating from the decay chain, mainly uranium and thorium series. The main source of population exposure to ionizing radiation (more than 80 %) is the natural radioactivity. Radon and its short lived progeny contribute with more than 50 % to the radiation dose received by the general population from all sources, and the World Health Organization has recognized radon as the second most important cause of lung cancer. The European Council has laid down a basic safety standards (BSS, Council Directive 2013/59/Euratom) for the protection against the dangers arising from exposure to ionizing radiation, obliging member states, among other, to investigate the exposure of members of the public and workers to indoor radon, to develop a radon action plan and to inform the public about radon levels they are exposed to. As a consequence, this has led to increased number of indoor radon measurements in recent years. There are numerous methods for indoor radon measurement which can be performed either by direct measurement of radon or indirectly by measuring radon progeny, with or without radon presence. The choice of method used depends on the purpose of the measurements, available instrumentation and time. In order to assess the reliability of indoor radon measurement methods available in “Vinca” Institute of Nuclear Sciences, comparative measurement were conducted. Indoor radon concentration was measured in four working rooms in Vinca Institute, two offices and two laboratory premises, in the period of October-November 2020. In all locations continuous radon measurements were performed with tree different active measurement devices: RTM1688-2 and Radon Scout from SARAD GmbH, and RadonEye from RadonFTLAB, while integrated radon measurements were conducted with charcoal canisters. In addition, Equilibrium Equivalent Radon Concentration EERC was measured with radon progeny monitor RPM2200 (SARAD GmbH). Measurement by all active devices was performe
Published: 2021

29. Quantification of radioisotopic pollution of soil from coal fired power plant surrounding

Author: Sarap, Nataša, Krneta-Nikolić, Jelena D., Meseldžija, Slađana, Janković Mandić, Ljiljana, and Janković, Marija M.
Subjects: Radioactivity, Soil pollution, fungi, food and beverages, complex mixtures, Power plant
Abstract: This paper is focused on determination of activity concentration of gamma emitters in surface layer of soil, in surrounding of the coal-fired power plant complex. Also, the impact of coal-fired power plant emissions on certain of physical and chemical properties of the soil was studied. The results of this study indicated that the operation of the power plant has no significant negative impact on the environment in terms of the content of radionuclides. The effect of the coal-fired power plant emissions on soil is a function of the pollutant gradient existing in the area. The increased soil acidity can adversely affect the microbiological and pedogenetic processes in soil which cause cation-anion imbalance and microbe population reduction to affect soil fertility. © 2020, Editura Academiei Romane. All rights reserved.
Published: 2020

30. Calibration of recycled open-faced charcoal canisters for two- and one-day radon concentration measurements

Author: Živanović, Miloš, Pantelić, Gordana K., Čeliković, Igor T., Krneta-Nikolić, Jelena D., Vukanac, Ivana, Zekić, Ranko, Svrkota, Nikola, Kastratović, Dejan, and Vukotić, Perko
Abstract: VIII International Conference on Radiation in Various Fields of Research : RAD 2020 : book of abstracts; Virtual Conference
Published: 2020

31. Determining the probability of locating peaks using computerized peak-location methods in gamma-ray spectra as a function of the relative peak-area uncertainty

Author: Ali Santoro, M. C., Anagnostakis, Marios J., Boshkova, T, Camacho, A, Iljadica, M.C. Fornaciari, Collins, S.M., Perez, R Diaz, Delgado, J.U., Đurašević, Mirjana M., Duch, M.A., Elvira, V.H., Gomes, R.S., Gudelis, A, Gurau, Daniela, Hurtado Bermudez, S, Idoeta, R, Jevremović, Aleksandar M., Kandić, Aleksandar, Korun, M, Karfopoulos, Konstantinos L., Laubenstein, Matthias, Long, S, Margineanu, R.M., Mitsios, I, Mulas, D, Krneta-Nikolić, Jelena D., Pantelica, A, Medina, V Peyres, Pibida, L, Potiriadis, C, Silva, R.L., Siri, S, Šešlak, Bojan Ž., Verheyen, L, Vodenik, B, Vukanac, Ivana, Wiedner, H, Zorko, B, Ali Santoro, M. C., Anagnostakis, Marios J., Boshkova, T, Camacho, A, Iljadica, M.C. Fornaciari, Collins, S.M., Perez, R Diaz, Delgado, J.U., Đurašević, Mirjana M., Duch, M.A., Elvira, V.H., Gomes, R.S., Gudelis, A, Gurau, Daniela, Hurtado Bermudez, S, Idoeta, R, Jevremović, Aleksandar M., Kandić, Aleksandar, Korun, M, Karfopoulos, Konstantinos L., Laubenstein, Matthias, Long, S, Margineanu, R.M., Mitsios, I, Mulas, D, Krneta-Nikolić, Jelena D., Pantelica, A, Medina, V Peyres, Pibida, L, Potiriadis, C, Silva, R.L., Siri, S, Šešlak, Bojan Ž., Verheyen, L, Vodenik, B, Vukanac, Ivana, Wiedner, H, and Zorko, B
Abstract: The probabilities of locating peaks with a high relative peak-area uncertainty were determined empirically with nine types of peak-location software used in laboratories engaged in gamma-ray spectrometry measurements. It was found that it is not possible to locate peaks with a probability of 0.95, when they have a relative peak-area uncertainty in excess of 50%. Locating peaks at these relatively high peak-area uncertainties with a probability greater than 0.95 is only possible in the library-driven mode, where the peak positions are supposed a-priori. The deficiencies of the library-driven mode and the possibilities to improve the probabilities of locating peaks are briefly discussed. © 2019 Elsevier Ltd
Published: 2020

32. Radon and thoron exhalation rate measurements from building materials used in Serbia

Author: Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš Z., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Kandić, Aleksandar, Lončar, Boris B., Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš Z., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Kandić, Aleksandar, and Lončar, Boris B.
Abstract: The second most important source of indoor radon, after soil beneath dwelling, is building material. With the increase in environmental awareness and new energy-saving policies, residents tend to replace the existing windows with tighter windows, which leads to a decrease in air exchange rate and consequently an increase in indoor radon concentration. In case of low exchange rates, dose caused by inhalation of radon and its progeny can exceed external dose originating from the radium content in the surrounding building material. In this paper, surface exhalation rates of radon ( 222 Rn) and thoron ( 220 Rn) from typical building materials used for construction and interior decoration of houses in Serbia were investigated. Surface exhalation rate measurements were performed using the closed-chamber method, while concentrations of radon and thoron in the chamber were continuously measured using an active device, RTM1688-2, produced by SARAD® GmbH. Finally, the impact of the replacement of windows on the indoor radon concentration was estimated.
Published: 2020

33. Radon measurements using open-faced charcoal canisters - Measurement uncertainty and method optimization

Author: Živanović, Miloš Z., Pantelić, Gordana K., Čeliković, Igor T., Krneta-Nikolić, Jelena D., Vukanac, Ivana, Kržanović, Nikola, Živanović, Miloš Z., Pantelić, Gordana K., Čeliković, Igor T., Krneta-Nikolić, Jelena D., Vukanac, Ivana, and Kržanović, Nikola
Abstract: Open-faced charcoal canisters have been used for radon measurements for over 40 years. This method is sensitive to temperature, changing radon concentrations, humidity and other parameters, but a comprehensive study dealing with the influence quantities and measurement uncertainty was not available in literature. In this paper, all the identified influence quantities are discussed in detail, uncertainty budget is developed, good practice and bad practice examples are introduced and new recommendations are proposed to optimize the method and reduce uncertainty.
Published: 2020

34. Assessment of natural radioactivity levels and radon exhalation rate potential from various building materials

Author: Vukanac, Ivana, Janković, Marija M., Rajačić, Milica, Todorović, Dragana, Ujić, Predrag, Pantelić, Gordana K., Sarap, Nataša, Krneta-Nikolić, Jelena D., Vukanac, Ivana, Janković, Marija M., Rajačić, Milica, Todorović, Dragana, Ujić, Predrag, Pantelić, Gordana K., Sarap, Nataša, and Krneta-Nikolić, Jelena D.
Abstract: Various imported building materials commonly used in construction and industry in Serbia were analyzed using gamma spectrometry. Based on the activity concentrations of 226Ra, 232Th, and 40K in the investigated samples, radium equivalent activity, Raeq, absorbed dose rate, D, annual effective dose, DE, and the external hazard index, Hex, were calculated to assess the radiation hazard for people. The Raeq for most of the analyzed samples (416 in total) was lower than the maximum admissible value of 370 Bqkg-1 set in the UNSCEAR report. The absorbed gamma dose rate in air was found to vary from 0.030 mGyh-1 to 1.328 mGyh-1 which in some cases exceeded indoor dose rates in Europe. The obtained values for annual effective dose exceed the limits of 0.41 mSv given in literature for about 5 % of measured samples, while values of Hex were higher than unity for three samples of cement, eight samples of granite, and one sand sample. As a possible source of elevated effective dose, the radon exhalation from building materials was estimated using the parameters given in literature. The internal dose due to 222Rn exhaled from the building material was found to be up to nine times higher than external dose due to 226Ra content in some cases.
Published: 2020

35. Experimental study of low-rank coals using simultaneous thermal analysis (TG–DTA) techniques under air conditions and radiation level characterization

Author: Janković, Marija M., Janković, Bojan Ž., Marinović-Cincović, Milena, Porobić, Slavica, Krneta-Nikolić, Jelena D., Sarap, Nataša, Janković, Marija M., Janković, Bojan Ž., Marinović-Cincović, Milena, Porobić, Slavica, Krneta-Nikolić, Jelena D., and Sarap, Nataša
Abstract: Simultaneous thermal analysis (TG–DTA) of low-rank coals from different annual periods (2015 and 2018) which originate from Kolubara and Nikola Tesla A (TENT A) coal-fired power plants was studied to identify their combustion characteristics and self-ignition risks. In order to investigate kinetics of thermo-oxidative degradation, model-free models including the Friedman and Kissinger–Akahira–Sunose methods were applied. In accordance with obtained kinetic results, numerical optimization of combustion process was implemented. Homogeneous and heterogeneous types of ignition were identified for the tested coals, and factors that affect their occurrence are the used heating rate and volatile matter content. From thermal susceptibility graph, it was found that the tested coals expand in a wide range of self-ignition risk, depending on their coal rank. The youngest coal (TENT A (2018)) has the largest propensity to self-ignite among high-ranking coals. It was found that less tendency of 2018 coals to show true isokinetic temperature in comparison with 2015 coals is a consequence of intraparticle diffusion limitations, and change of char properties, at higher conversion values. Gamma spectrometry analysis of coals showed that higher concentration of 40K radionuclide (which is in mineral composition) may contribute through its deposition on available sites, decreasing surface area for reaction with oxidizing species. © 2020, Akadémiai Kiadó, Budapest, Hungary.
Published: 2020

36. Assessment of radioactivity contribution and transfer characteristics of natural radionuclides in agroecosystem

Author: Sarap, Nataša, Krneta-Nikolić, Jelena D., Trifković, Jelena Đ., Janković, Marija M., Sarap, Nataša, Krneta-Nikolić, Jelena D., Trifković, Jelena Đ., and Janković, Marija M.
Abstract: Taking into account the importance of distribution and transfer of radionuclides in the soil–plant system, especially in agricultural fields, the aim of this research was assessment of radioactivity contribution and transfer characteristics of natural radionuclides in agroecosystem. The measurement of the natural radioactivity distribution was conducted in organic and sustainable farming management systems. Statistical evaluation of the physical and chemical properties of soils subjected to different farming systems, revealed the existence of differences in some parameters. Balanced distribution of natural radionuclides in soil-crop system was observed. Radionuclide 40K was the most accessible to the investigated crops via uptake from the soil, then 232Th and 226Ra. The obtained results are useful for understanding the behavior of the radionuclides and provide an insight into the cumulative deposition of radioactivity in the agroecosystem.
Published: 2020

37. Consistency test of coincidence-summing calculation methods for extended sources

Author: Sima, Octavian, De Vismes-Ott, Anne, Dias, M. S., Dryak, Pavel, Ferreux, Laurent, Gurau, Daniela, Hurtado, S., Jodlowski, Pawel, Karfopoulos, Konstantinos L., Koskinas, Marina Fallone, Laubenstein, Matthias, Lee, Y. K., Lepy, Marie Christine, Luca, Aurelian, Menezes, M. O., Moreira, Denise S., Krneta-Nikolić, Jelena D., Peyres, Virginia, Saganowski, Pawel, Savva, Marilia I., Semmler, Renato, Solc, Jaroslav, Thanh, T. T., Tyminska, Katarzyna, Tyminski, Zbigniew, Vidmar, Tim, Vukanac, Ivana, Yucel, Haluk, Sima, Octavian, De Vismes-Ott, Anne, Dias, M. S., Dryak, Pavel, Ferreux, Laurent, Gurau, Daniela, Hurtado, S., Jodlowski, Pawel, Karfopoulos, Konstantinos L., Koskinas, Marina Fallone, Laubenstein, Matthias, Lee, Y. K., Lepy, Marie Christine, Luca, Aurelian, Menezes, M. O., Moreira, Denise S., Krneta-Nikolić, Jelena D., Peyres, Virginia, Saganowski, Pawel, Savva, Marilia I., Semmler, Renato, Solc, Jaroslav, Thanh, T. T., Tyminska, Katarzyna, Tyminski, Zbigniew, Vidmar, Tim, Vukanac, Ivana, and Yucel, Haluk
Abstract: An internal consistency test of the calculation of coincidence-summing correction factors FC for volume sources is presented. The test is based on exact equations relating the values of FC calculated for three ideal measurement configurations. The test is applied to a number of 33 sets of FC values sent by 21 teams. Most sets passed the test, but not the results obtained using the quasi-point source approximation; in the latter case the test qualitatively indicated the magnitude of the bias of FC. © 2019 Elsevier Ltd
Published: 2020

38. Content of radioactive isotopes of hydrogen in the precipitation from different meteorological stations in Serbia

Author: Janković, Marija M., Sarap, Nataša, Rajačić, Milica, Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Todorović, Dragana, Vukanac, Ivana, and Radenković, Mirjana
Abstract: Tricijum, radioaktivni izotop vodonika ima i prirodno i antropogeno poreklo. Pri svom raspadu emituje niskoenergetsko beta zračenje i pri tom da bi bio detektovan mora se uvesti u aktivnu zapreminu detektora. Za detekcijuje korišćen tečni scintilacioni spektrometar Ultra Low Level Liquid Scintillation Spectrometer Quantulus 1220. U ovom radu prikazani su rezultati sadrţaja tricijuma u padavinama sakupljenim na referentnim meteorološkim stanicama u Srbiji (Beograd, Subotica, Niš, Zlatibor, Zaječar iVranje). Sadrţaj tricijuma je određenu kompozitnim mesečnim uzorcima, a period ispitivanja pokriva 2018. godinu. Rezultati ispitivanja pokazuju da su dobijene vrednosti u padavinama ispod granica predviđenih zakonskom regulativom. Tritium, the radioactive isotope of hydrogen, has a natural and anthropogenic origin. It emits low-energy beta radiation and, in order to be detected, it must be introduced into the active volume of the detector. For detection,Ultra Low Level Liquid Scintillation Spectrometer Quantulus 1220was used.This paper presents the results of the tritium content in precipitation collected at reference meteorological stations in Serbia (Belgrade, Subotica, Niš, Zlatibor, Zajeţar and Vranje). The content of tritium is determined in composite monthly samples, andthe test period covers 2018. The results show that the obtained values in precipitation at investigated locations are below the limits prescribed by the Serbian legislation. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ [Друштва за заштиту од зрачења Србије и Црне Горе], 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

39. Measurement of radon in water - REM 2018 radon-in-water PT

Author: Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Vukanac, Ivana, Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, and Radenković, Mirjana
Abstract: Godine 2018. Laboratorija za zaštitu od zračenja i zaštitu životne sredine je učestvovala u interkomparaciji "REM 2018 radon-in-water proficiency test". Zadatak je bio izmeriti koncentraciju radona u dostavljenom uzorku vode. Ovaj uzorak je meren gama spektrometrijski na HPGe detektoru. Najpre je merenje izvršeno na uzorku u nativnom obliku, bez otvaranja boce u kojoj je dostavljen. Zatim je sadržaj boce prebačen u Marineli geometriju i ponovo izmerenna istomdetektoru.Pri proračunu aktivnosti korišćen je transfer efikasnosti programom EFFTRANi kalibracija QA/QC uzorkom vode,dostavljenim u okviru interkomparacije IAEA-TEL-2018-03.Poređenjem dobijenih rezultata i referentnevrednosti dateu preliminarnom izveštaju organizatora interkomparacije, utvrđeno je da postoji značajna zavisnost rezultata odpristupa merenju i proračunu aktivnosti. U ovom radu su predstavljeni rezultati oba pristupa i analiza i komentar tačnosti i preciznosti rezultata. In 2018, Laboratory for Environment and Radiation Protection took part in the proficiency test "REM 2018 radon-in-water proficiency test". The task of this proficiency test was to determine the concentration of radon in the water sample. This sample was measured by gamma spectrometry on HPGe detector. Firstly, the measurement was performed on the native sample, without opening the bottle in which the sample was delivered. After that, the sample was placed into Marinelli beaker and measured again on the same detector. To calculate the activity concentration of radon in the sample, the calibration was performed using QA/QC sample from the IAEA-TEL-2018-03 proficiency test andthe efficiency transfer was performed using EFFTRAN software. Comparison of the obtained results with the reference value, provided in the preliminary report of the proficiency test, showed that there is a significant influence of the measurement geometry and the calculation approach. In thispaper, the results of both approaches to the measurement and calculation will be presented and the trueness and precision of the results will be analyzed and commented. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

40. Radioecology and population exposure to ionizing radiation - the first 55 years

Author: Todorović, Dragana, Vukanac, Ivana, Pantelić, Gordana K., Forkapić, Sofija, Mitrović, Branislava M., Ilić, Jovana S., Janković, Marija M., Krneta-Nikolić, Jelena D., Rajačić, Milica, Sarap, Nataša, and Radenković, Mirjana
Abstract: U ovom radu dat je pregled radova prezentovanih u oblasti Radioekologije i izlaganja stanovništva na skupovima Društva za zaštitu od zračenja, počev od I jugoslovenskog simpozijuma o radiološkoj zaštiti u Portoroţu 1963. godine i zaključno sa XXIX Simpozijumom Društva za zaštitu od zračenja Srbije i Crne Gore odrţanom na Srebrnom jezeru 2017. godine. U radu je dat pregled aktuelnih tema, osvrt na razvoj metoda i tehnika merenja, kao i opšti trendovi razvoja i diferenciranja oblasti radioekologije uslovljenih dogaĎanjima u obuhvaćenom vremenskom periodu. This paper gives an overview of the papers in the field of radioecology and population exposure to ionizing radiation presented at the Radiation Protection Association symposia starting with the 1stYugoslav Radiation Protection Association symposium held in Portoroţ in 1963 and concluding with the 29thsymposium of the Society for Radiation Protection of Serbia and Montenegro held at Srebrno jezero in 2017. An overview of current topics, methods andmeasurement techniques development review, as well as general trends in the development and differentiation of the radioecology field due to different events in the covered period are presented. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681]
Published: 2019

41. The effect of cosmic radiation on the 7-Be concentration in the total deposit

Author: Rajačić, Milica, Todorović, Dragana, Krneta-Nikolić, Jelena D., Sarap, Nataša, Janković, Marija M., Pantelić, Gordana K., Vukanac, Ivana, and Radenković, Mirjana
Abstract: Berilijum-7 (7Be)je radioaktivni berilijumov izotop koji nastaje u interakcijama kosmič-kog zračenja sa atomima atmosfere. Intenzitet kosmičkog zračenja usled nehomogenosti magnetnog polja Zemlje, ispoljava prostornu distribuciju, dok je vremenska distribucija posledica vremenski promenljivog magnetnog polja Sunca. Cilj ovog istraţivanja je da se izvrši analiza uticaja vremenske promene intenziteta kosmičkog zračenja na koncentraciju7Be u kompozitnim mesečnim uzorcima ukupnog (suvog i mokrog) depozita. Uzorci depozita su sakupljani u Institutu za nuklearne nauke "Vinča", a sva merenja koncentracije 7Be su uraĎena u Laboratoriji za zaštitu od zračenja i zaštitu ţivotne sredine. Rezultati merenja uzoraka prikupljenih u periodu od 1994. do 2016. su korelirani sa mesečnim podacima o intenzitetu kosmičkog zračenja iz istog perioda, preuzetim sa sajta stanice "Apatity", Polarnog geofizičkog instituta, Ruske akademije nauka. Ova stanica poseduje neutronski monitor "Standard 18-NM-64" lociran na nadmorskoj visini od 181 m sa geografskim koordinatama od N:67,57° i E:33,39°. TakoĎe, rezultati merenja oba posmatrana parametra su grupisani po godinama i mese-cima u godini, a zatim su odreĎeni njihovi godišnji i mesečni indeksi. Nakon toga, za ispitane parametre su meĎusobno korelirani kako godišnji, tako i njihovi mesečni indeksi. Dobijeni rezultati ukazuju da fluktuacije kosmičkog zračenja utiču samo na varijacije godišnjih indeksa koncentracije7Be u ukupnom depozitu. Koeficijent determinacije godišnjih indeksa posmatranih parametara govori da se modulisanošću kosmičkog zračenja moţe objasniti 33% varijacije godišnjih vrednosti koncentracije 7Be u depozitu. Beryllium-7 (7Be) is a radioactive beryllium isotope that is produced in the interaction of cosmic radiation with atmospheric atoms. Due to the heterogenous of the Earth's magnetic field, the intensity of cosmic radiation exhibits spatial distribution, while the time distribution is a consequence of the time-varying magnetic field of the Sun. The aim of thisresearch is to analyzethe influence of the intensity of cosmic radiation on the 7Be concentration in samples of the total (dry and wet) deposit. The deposit samples were collected at the Vinţa Institute of Nuclear Sciences, and all 7Be concentration measurements were performedin the Department of Radiation and Environmental Protection. The results of the measurements were collected in the period from 1994 to 2016 and they were correlated with the monthly neutron monitor data of the "Apatity",the Polar Geophysical Institute, the Russian Academy of Sciences. This station has the neutron monitor "Standard 18-NM-64" located at the altitude of 181 m with geogra-phical coordinates of N: 67.57° and E: 33.39°. Also, the results of the measurement of both observed parameters are grouped by years and months of the year, and then their annual and monthly indices were determined. After that, the annual as well as monthly indices of the observed parameters were correlated. The obtained results indicate that the fluctuations in the galactic part of cosmic radiation affect the variation of the annual 7Be concentration index in the deposit. The coefficient of determining the annual indices of the observed parameters shows that the modulation of cosmic radiation can explain 33% of the variation of the annual values of the concentration of 7Be in the deposit. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

42. Seasonal variations of naturally occurring radionuclides and 137cs in the leaves of deciduous tree species at sites of background radioactivity levels

Author: Vukašinović, Ivana Ž., Todorović, Dragana, Krneta-Nikolić, Jelena D., Rajačić, Milica, and Životić, Ljubomir
Subjects: Cs-137, Natural radionuclides, Soil-to-leaves transfer factors, Background sites
Abstract: Activity concentration of natural radionuclides and 137Cs were studied in leaves of the deciduous trees. In the spring and autumn season, leaves were collected in the area of normal background radiation levels represented by city parks in a multi-year period (2002-2012). Measurements by means of gamma-ray spectrometry showed 226Ra and 210Pb seasonal accumulation in leaves, while 238U and 235U could be detected only in autumn. Difference between seasons was not found significant for 40K and 137Cs. The study of radionuclides transfer factors was conducted by analyzing its relationships with basic soil properties at the beginning and the end of the vegetation period. © 2019, Editura Academiei Romane. All rights reserved.
Published: 2019

43. Assessment of radioecological parameters for radioisotope 90-Sr in agroecosystem

Author: Sarap, Nataša, Janković, Marija M., Rajačić, Milica, Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Todorović, Dragana, Vukanac, Ivana, and Radenković, Mirjana
Abstract: Translokacije stabilnih i radioaktivnih izotopa iz jedne u drugu kariku ekološkog sistema, kvantitativno i kvalitativno se opisuju preko odreĎenih ekoloških parametara. Procena radioekološke situacije je sprovedena odreĎivanjem različitih parametara koji predstavljaju objektivne pokazatelje radijacione sigurnosti za ciklus obrade zemljišta i biljne proizvodnje, čime je utvrĎena translokacija radionuklida 90Sr u agroekosistemu ispitivanog područja. U sprovedenoj studiji su prikazani sledeći radioekološki parametri: transfer faktor zemljište -usev, broj stroncijumovih jedinica, koeficijent diskriminacije, koeficijent zaštite i K-parametar. Ovi parametri su izračunati na osnovu specifične aktivnosti radioizotopa 90Sr i koncentracije ukupnog kalcijuma uzemljištu i usevima. Rezultati izračunavanja radioekoloških parametara su ukazali na sledeće činjenice: najveći deo radioizotopa 90Sr akumulira se u korenu useva, što potvrĎuje da je glavni mehanizam njegove akumulacije resuspenzija iz zemljišta; brzina akumulacije 90Sr u odnosu na ukupni Ca iz zemljišta zavisi od vrste zemljišta i useva, kao i od koncentracije ukupnog Ca u zemljištu. Translocation of stabile and radioactive isotopes from one to the other chain in the ecosystem is quantitatively and qualitatively described using the certain ecological parameters. The assesment of the radioecological situation is performed by determination of different parameters that represent the objective indicators of radiation safety for processing of soil and plant production. In this way, translocation of 90Sr in the agro-ecosystem of the investigated areas is determined. The following radiological parameters are presented in this study: soil-crop transfer factor, nuber of strontium units, discrimination coefficient and K-parameter. These parameters are calculated based on the specific activity of 90Sr and total Ca concentration in soil and crop. The results of the parameter calculation indicated that for the most part, 90Sr is acumulated in the root of the crop, which confirmes that the main path of the acumulation is the resuspension from soil; 90Sr acumulation rate, in comparison to total Ca in soil, depends on the soil and crop type as well as the total Ca concentration in soil. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ [Друштва за заштиту од зрачења Србије и Црне Горе], 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

44. Procena nesigurnosti rezultata merenja usled postupka uzorkovanja

Author: Vukanac, Ivana, Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, and Radenković, Mirjana
Abstract: Merna nesigurnost rezultata merenja predstavlja pokazatelj kvaliteta izvršenog merenja. U laboratorijama za ispitivanje najčešće se prikazuje kombinovana merna nesigurnost na nivou poverenja 95% (k=2). U slučaju kada laboratorijskoj analizi prethodi postupak uzorkovanja, budžet nesigurnosti rezultata merenjatreba (prema ISO17025:2017), da obuhvata i nesigurnost koja potiče usled postupka uzorkovanja. U ovom radu je opisan postupak procene nesigurnosti rezultata merenja usled uzorkovanja. The uncertainty of the measurement results is an indicator of the quality of the performed measurement. In the testing laboratories, the combined measurement uncertainty is usually given at the level of confidence of 95% (k = 2). If the laboratory analysis is preceded by a sampling procedure, the uncertainty budget of the measurement results should (according to ISO17025: 2017) include the uncertainty arising from the sampling procedure. This paper describes the procedure for estimating the uncertainty of the results of measurement due to sampling. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

45. Study on the environmental contamination by depleted uranium in Serbia, 20 years later

Author: Radenković, Mirjana, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, Krneta-Nikolić, Jelena D., Rajačić, Milica, Vukanac, Ivana, and Pantelić, Gordana K.
Abstract: U radu su prikazane mogućnosti za ispitivanje kontaminacije ţivotne sredine, do koje je došlo 1999. godine tokom dejstava NATO avijacije osiromašenim uranijumom na nekoliko lokaliteta u juţnoj Srbiji. S obzirom na proteklo vreme, imajući u vidu da je izvršena sanacija kontaminiranih područja i da rezultati monitoringa ne pokazuju značajna odstupanja od prirodnih varijacija, za sva dalja istraţivanja bi bilo potrebno razmotriti unapredjivanje i uvodjenje osetljivijih metoda i tehnika za odredjivanje niskih koncentracija uranijuma i njegovih izotopa u sloţenim matriksimaiz ţivotne sredine i biološkim materijalima. Dosadašnja istraţivanja su obuhvatila radiohemijsku karakterizaciju projektila, ispitivanjesadrţaja, distribucije i migracijeOU kroz različite segmente ţivotnesredine, mobilnost i veze sa prirodnim supstratima u zemljištu. Za analizu su korišćene radiohemijske analitičkeprocedure i tehnike kao što su separacija primenom jonskehromatografije, primena trasera, elektrodepozicija,višestepene sekvencijalne ekstrakcije, fluorimetrijska, alfa spektrometrijska i gamaspektrometrijska merenja. Dalja ispitivanja bi se mogla vršiti u pravcu specijacije OU, analize njegove kinetike i termodinamike u fizičko-hemijskim procesima u ţivotnoj sredini uz primenu komplementarnih analitičkih procedura i tehnika visoke osetljivosti i tehnika pogodnih za mikroanalizu čestica ikarakterizaciju materijala, kao što su HR ICP-MS, LSC, SIMS, μ-XANES itd. The capabilities of study on environmental contamination caused 1999 by NATO air strikes using depleted uranium at several locations in southern Serbia. Having in mind passed time, implemented clean up activities in contaminated areas and no indication of significant deviations from natural levels within the monitoring assessment, for any further studies on low level uranium and its isotopes concentrations in complex environmental and biological samples, the advanced and more sensitive methods and techniques should be involved. Up to now, the studies on the radiochemical characterization of the projectile, depelted uranium contents, distribution and migration through the environmental departments and on ingress into natural substrates, have been conducted using the radiochemical analytical procedures and techniques like ion chromatography separations, application of tracers, electrodeposition, multi-step sequential extractions, fluorometric, alpha spectrometric and gama spectrometric measurements. The topic of further studies may be depleted uranium speciation, kinetic and thermodynamic analysis of its behaviour in environmental physicochemical processes so that complementary highly sensitive analytical procedures and techniques as well as techniques suitable for particles microanalysis and materials chracterization, like HR ICP-MS, LSC, SIMS,μ-XANES, etc, should be considered. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

46. Sources of uncertainty in classification of radon zones

Author: Čeliković, Igor T., Pantelić, Gordana K., Živanović, Miloš Z., Vukanac, Ivana, and Krneta-Nikolić, Jelena D.
Abstract: Evropski savet je doneo direktivu 2013/59/EURATOM (EU-BSS) po kojoj se nalaže državama članicama EU da imaju ustanovljen radonski akcioni plan, što između ostalog podrazumeva i identifikaciju radonskih prioritetnih zona (Radon priority areas), odnosno zona sa različitim nivoom "prioriteta". S obzirom da je neizvodljivo vršiti merenja radona u svakoj kući, potrebno je dizajnirati prospekciju radona kako bi se dobila reprezentativna procena srednje godišnje koncentracije radona u zatvorenim prostorijama na određenoj teritoriji. Nije bitan samo reprezentativan izbor kuća, nego je i nesigurnost merenja i procene srednje godišnje koncentracije potrebno držati što je niže moguće. Nesigurnostn klasifikacije zone određenog prioriteta u nekoj oblasti je stoga kombinacija nesigurnosti pojedinačnog merenja i ekstrapolacije tog merenja na celu oblast. U ovom radu ćemo pokušati da nabrojimo i procenimo izvore nesigurnosti pri klasifikaciji i damo preporuke u cilju smanjenja stepena nesigurnosti. Ovaj rad je urađen u sklopu MetroRadon projekta. The EC has laid down directive 2013/59/EURATOM which represents basic safety standards regarding the radon protection of the European citizens. Within the BSS they oblige countries to establish radon action plans which include identification of Radon Priority Areas (RPA). Since it is not feasible to perform indoor radon measurements in each dwelling, it is necessary to carefully design indoor radon survey in order to get representative estimation of annual average indoor radon concentration of the certain territory. It is not sufficient only to have representative selection of dwellings, but it is important to keep uncertainty of measurement and estimation of annual radon concentration as low as possible. Uncertainty of classification of radon zones is therefore combination of uncertainties coming from a single measurement uncertainty and uncertainty of extrapolation of single or group of measurements to the whole region. In this contribution, we will try to estimate sources of classification uncertainties and to give recommendation in order to reduce level of uncertainty. The research presented in this paper was realized within 16ENV04 MetroRADON project. This project has received funding from the EMPIR programme co-financed by the Participating States and from the European Union‘s Horizon 2020 research and innovation programme. Proceedings: [http://vinar.vin.bg.ac.rs/handle/123456789/8681] XXX симпозијум ДЗЗСЦГ (Друштва за заштиту од зрачења Србије и Црне Горе), 2- 4. октобар 2019. године, Дивчибаре, Србија
Published: 2019

47. Assessment of radioactivity contribution and transfer characteristics of natural radionuclides in agroecosystem

Author: Sarap, Nataša B., primary, Krneta Nikolić, Jelena D., additional, Trifković, Jelena Đ., additional, and Janković, Marija M., additional
Published: 2019
Full Text: View/download PDF

48. RADIONUCLIDES' CONTENT IN FOREST ECOSYSTEM LOCATED IN SOUTH-WESTERN PART OF SERBIA.

Author: HADROVIĆ, Sabahudin H., ČELIKOVIĆ, Igor T., KRNETA NIKOLIĆ, Jelena D., RAJAČIĆ, Milica M., and TODOROVIĆ, Dragana J.
Subjects: CESIUM isotopes, DECIDUOUS plants, RADIOISOTOPES, ECOSYSTEMS, ISOTOPES, STATISTICS
Abstract: The results of the gamma-spectrometric measurements in a 16500 ha large region of south-western Serbia, are presented. Activity concentrations of 40K, 137Cs, and 210Pb in different deciduous and evergreen trees in the region are investigated. For all the investigated isotopes, there is a tendency that, on average, the lowest activity concentrations were found in tree stems, then in leaves, while the highest ones were in the soil. Statistical analysis did not show any differences between activity concentrations of leaves and needles, showing that both leaves and needles could be equally well used as a biomonitors. [ABSTRACT FROM AUTHOR]
Published: 2021
Full Text: View/download PDF

49. Qualitative overview of indoor radon surveys in Europe

Author: Pantelić, Gordana K., Čeliković, Igor T., Živanović, Miloš Z., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Cinelli, Giorgia, Gruber, Valeria, Pantelić, Gordana K., Čeliković, Igor T., Živanović, Miloš Z., Vukanac, Ivana, Krneta-Nikolić, Jelena D., Cinelli, Giorgia, and Gruber, Valeria
Abstract: The revised European Directive from 2013 regarding basic safety standard oblige EU Member States to establish a national action plan regarding the exposure to radon. At the same time, International Atomic Energy Agency started technical projects in order to assist countries to establish and implement national radon action. As a consequence, in recent years, in numerous countries national radon surveys were conducted and action plans established, which were not performed before. In this paper, a qualitative overview of radon surveys performed in Europe is given with a special attention to the qualitative and conceptual description of surveys, representativeness and QA/QC (quality assurance/quality control). © 2019
Published: 2019

50. Merenje radona u vodi - REM 2018 radon-in-water PT

Author: Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Vukanac, Ivana, Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, Radenković, Mirjana, Krneta-Nikolić, Jelena D., Pantelić, Gordana K., Vukanac, Ivana, Rajačić, Milica, Janković, Marija M., Sarap, Nataša, Todorović, Dragana, and Radenković, Mirjana
Abstract: Godine 2018. Laboratorija za zaštitu od zračenja i zaštitu životne sredine je učestvovala u interkomparaciji "REM 2018 radon-in-water proficiency test". Zadatak je bio izmeriti koncentraciju radona u dostavljenom uzorku vode. Ovaj uzorak je meren gama spektrometrijski na HPGe detektoru. Najpre je merenje izvršeno na uzorku u nativnom obliku, bez otvaranja boce u kojoj je dostavljen. Zatim je sadržaj boce prebačen u Marineli geometriju i ponovo izmerenna istomdetektoru.Pri proračunu aktivnosti korišćen je transfer efikasnosti programom EFFTRANi kalibracija QA/QC uzorkom vode,dostavljenim u okviru interkomparacije IAEA-TEL-2018-03.Poređenjem dobijenih rezultata i referentnevrednosti dateu preliminarnom izveštaju organizatora interkomparacije, utvrđeno je da postoji značajna zavisnost rezultata odpristupa merenju i proračunu aktivnosti. U ovom radu su predstavljeni rezultati oba pristupa i analiza i komentar tačnosti i preciznosti rezultata., In 2018, Laboratory for Environment and Radiation Protection took part in the proficiency test "REM 2018 radon-in-water proficiency test". The task of this proficiency test was to determine the concentration of radon in the water sample. This sample was measured by gamma spectrometry on HPGe detector. Firstly, the measurement was performed on the native sample, without opening the bottle in which the sample was delivered. After that, the sample was placed into Marinelli beaker and measured again on the same detector. To calculate the activity concentration of radon in the sample, the calibration was performed using QA/QC sample from the IAEA-TEL-2018-03 proficiency test andthe efficiency transfer was performed using EFFTRAN software. Comparison of the obtained results with the reference value, provided in the preliminary report of the proficiency test, showed that there is a significant influence of the measurement geometry and the calculation approach. In thispaper, the results of both approaches to the measurement and calculation will be presented and the trueness and precision of the results will be analyzed and commented.
Published: 2019

Catalog

Books, media, physical & digital resources

See catalog results

Searchworks

Select search scope, currently: Articles Catalog books, media & more in Jio Institute collections Articles journal articles & other e-resources

Search

Search Constraints

Refine your results

Search Limiters

Topic

Publication Year Range

Language

Publication Type

Journal

Database

Publisher

216 results on '"Krneta Nikolić, Jelena D."'

Search Results

Catalog

Select search scope, currently: Articles

Catalog

books, media & more in Jio Institute collections

Articles

journal articles & other e-resources