1,596 results on '"gamma-ray spectrometry"'
Search Results
2. Performances of halide scintillators for the dosimetry based on gamma-ray spectrometry for environmental monitoring systems
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Ji, Wanook, Lee, Eunjoong, and Ji, Young-Yong
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- 2025
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Catalog
3. Comparison of fast-neutron-induced reaction cross-sections in [formula omitted], [formula omitted], [formula omitted], [formula omitted], [formula omitted], [formula omitted], and [formula omitted] in quasi-monoenergetic fields of p+Li and d+TiT neutron sources
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Jarošík, J., Bonaldi, C., Fontana, C., Geerts, W., Macías, M., Oberstedt, S., Štefánik, M., Tsinganis, A., and Wagner, V.
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- 2025
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4. A simplified approach to counting statistics with an imperfect pileup rejector
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Pommé, S. and Pelczar, K.
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- 2025
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5. Patterns distribution, concentrations and sources of radioactive elements from black sand in the Red Sea coast, Egypt
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Hamed, Mohamed, Khaled, Mostafa A., Said, Rashad E.M., Ghoneim, Sobhi M., Saad, Eman, El-Aal, Mohamed Abd, and Sayed, Alaa El-Din H.
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- 2024
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6. Activity measurements and calibrations for 225Ac in radioactive equilibrium with its progeny
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Bergeron, Denis E., Hamad, Gulakhshan, Broder, Brittany A., Cessna, Jeffrey T., Pearce, Adam J., LaRosa, Jerome, Pibida, Leticia, Salter, Rhys, Saxena, Neha S., and Zimmerman, Brian E.
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- 2025
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7. Radiometric and petrographic characterization of El-Yatima granite: Evaluating radiological risks and mineralogical features
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Zakaly, Hesham M.H., Awad, Hamdy A., Lasheen, El Saeed R., Issa, Shams A.M., Elsaman, Reda, Khandaker, Mayeen Uddin, Al-awah, Hezam, Fathy, Douaa, and Sami, Mabrouk
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- 2024
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8. Evaluation of radioactivity concentration in farm fresh milk and concomitant dose to consumer
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Pervin, Shikha, Kabir, Md Minhaz, Dewan, Md Jafor, Khandaker, Mayeen Uddin, and Yeasmin, Selina
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- 2024
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9. A simple and precise methodology to determine particulate matter mass in atmospheric filters; validation and application cases
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Barba-Lobo, Alejandro, Gutiérrez-Álvarez, Isidoro, Adame, José Antonio, and Bolívar, Juan Pedro
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- 2022
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10. Improving Data Quality of an Old Airborne Geophysical Survey to Support Geological Mapping: A Case Study in Tahifet Region, Hoggar (Algeria)
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Allek, Karim, Zeghouane, Hocine, Hamoudi, Mohamed, Groun, Daoud, Oberhänsli, Roland, Series Editor, Roure, Francois, Series Editor, Frei, Dirk, Series Editor, Hamoudi, Mohamed, editor, Bendaoud, Abderrahmane, editor, Bodinier, Jean-Louis, editor, Ouzegane, Khadidja, editor, and Perfettini, Hugo, editor more...
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- 2025
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11. Activity concentrations of 226Ra, 232Th, 40K, and 238U in detergent powders and their potential radiation hazards
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Alshahri, Fatimh
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- 2020
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12. Radiological and chronological studies on black shales from Budaa area, southwestern Sinai, Egypt.
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Harpy, Nareman M.
- Abstract
The study measured the activity concentrations of various radionuclides (238U, 234U, 230Th, 226Ra, 222Rn, 232Th, 40K, and 235U) using γ-ray spectrometry in 11 black shale samples from three trenches and a wall in Budaa area, southwestern Sinai, Egypt. The samples were taken from different parts of Magharet El Meyiah Formation (top, middle, and base) to understand radionuclide migration processes. The average activity concentrations of 238U, 232Th, and 226Ra in all samples were higher than the worldwide averages, while 40K levels were lower. Isotopic ratio relationships showed accumulation of radionuclides in most samples except one sample lies in uranium leaching sector from the base layer of the wall. Uranium–Thorium (U–Th) dating revealed varying ages of uranium deposition: 42.43–119.90 ka in trench 1, 40.09–85.37 ka in trench 3, 63.92 ka in trench 2, and 106.50 and 325.80 ka in the top of wall, suggesting differential mobility of uranium. Hazard parameters like external radiation hazards (Hex < 1) were minimal and annual effective dose rates within acceptable limits, while, internal radiation hazards (Hin > 1) were a concern for samples from the top layers. All samples had absorbed dose rates higher than the global average, indicating elevated background radiation levels. [ABSTRACT FROM AUTHOR] more...
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- 2025
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13. Radon measurements in drinking water: a comparison between different techniques.
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Aït-Ziane, Mounir, Dupuis, Edmond, Loots, Hilde, Verheyen, Leen, Bruggeman, Michel, Lecomte, Marielle, Braekers, Damien, Mezaguer-Lekouaghet, Meriem, and Lounis-Mokrani, Zohra
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GAMMA ray spectrometry , *LIQUID scintillation counting , *SCINTILLATION spectrometry , *WATER sampling , *RADON , *DRINKING water - Abstract
Radon-222 concentrations in drinking water samples, collected from four sites, with known concentrations, located in Troine, Hoffelt and Hachiville (Luxembourg) and Sainte Adèle source (Belgium) have been found about 111.2, 90.4, 86.0, and 83.7 Bq l−1 respectively. The samples have been analysed by six laboratories using gamma-ray spectrometry, emanometry and liquid scintillation counting. The performance of the participating laboratories and their measurements were evaluated with respect to the consensus value using statistical tests. The obtained results indicate that all measurement system used as well as methods to measure radon-222 in water are good and comply to the European directive. [ABSTRACT FROM AUTHOR] more...
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- 2025
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14. Comparison of two gamma-ray datasets measured with different methods and assessment of their performance to predict soil properties.
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Karjalainen, Ville, Malinen, Jukka, and Tokola, Timo
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GAMMA ray spectrometry ,FISHER discriminant analysis ,STANDARD deviations ,SOIL moisture ,GAMMA rays - Abstract
Terrain mobility is directly dependent on soil properties, i.e. stoniness, soil particle size and peat depth. Gamma-ray spectrometry has been widely used in soil mapping as gamma-rays can penetrate up to 50 cm of soil. The method has proven to be effective in gathering information on various soil properties, such as clay and silt content, organic carbon content, soil pH, and soil stoniness. The intensity of gamma radiation decreases with increasing soil moisture content, which is important when assessing the load-bearing capacity of forest terrain, which affects the quality and planning of mechanized wood harvesting. In this study, we compared two gamma-ray datasets that were acquired from the same plots but measured with different methods: airborne gamma-ray spectrometry and a handheld gamma-ray spectrometer. Regression analyses were used to examine whether the gamma-ray datasets have significant similarities. Linear discriminant analysis was then used to study the performance of the two gamma-ray datasets when predicting different soil properties (stoniness index classes (SIC), soil depth, and peat depth). Our correlation analysis produced R
2 values of 0.18–0.29 and root mean square error (RMSE%) values of 0.48–0.55. Prediction of SIC was 67.1% accurate with ground gamma and 45.9% accurate with air gamma. For soil depth predictions, the accuracies were 64.7–70.0% for ground gamma and 61.7–63.5% for air gamma. Our findings showed that ground gamma-ray spectrometry is better at predicting soil properties than air gamma-ray spectrometry. [ABSTRACT FROM AUTHOR] more...- Published
- 2025
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15. Transfer factor of radionuclides from soil to cereal crops around gold mining and evaluation of corresponding radiological hazard levels Oromia, Ethiopia.
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Yachiso, Gebi Tuku, Chaubey, A. K., and Turi, Birhanu
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GAMMA ray spectrometry , *RADIOLOGICAL health risk , *NATURAL radioactivity , *RADIOACTIVE contamination , *GOLD mining - Abstract
Radionuclide distribution and transfer factors in plants are decisive parameters used to evaluate radioactive contamination in the environment and its radiological health risks to humans. In this study, the activities concentration of 226Ra, 232Th, and 40K were measured using NaI(Tl) gamma-ray spectrometry on soils and on corresponding teff and wheat plant samples analyzed collected from Sakaro gold mining area from Reji kebele, Oromia, Ethiopia. The results of mean activity concentration of 226Ra, 232Th, and 40K samples analyzedzed in soil, teff, and wheat samples were found to be 33.05 ± 0.72, 13.7 ± 0.51 and 220.18 ± 0.61 Bq.kg-1, 3.93 ± 0.4,27 ± 0.61 and 148.3 ± 0.5 Bq.kg-1 and 3.22 ± 0.43, 4.59 ± 0.64 and 229.8 ± 0.5 Bq.kg-1 respectively. Results showed that the activity concentration of radionuclides in this study area was within the limit. The transfer factors from soil to cereal crops (teff and wheat) were compared with the study done in a different country of the world and its values were below unity except for 40K in wheat samples. The absorbed dose rate, annual effective dose rate, external and internal hazards index, lifetime cancer risk, and annual effective ingestion dose were estimated and were also compared with the internationally accepted values. It was found that none of the results exceeded the recommended limit value. [ABSTRACT FROM AUTHOR] more...
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- 2024
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16. Health risk assessment and statistical analysis of natural radioactivity in the uranium exploration area of Zabili, Chad.
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Penabei, Samafou, Bongue, Daniel, Eyakifama, Hazou, Ngwa Ebongue, Alexandre, Mistura Bolaji, Ajani, Peane, Maleka, Guembou Shouop, Cebastien Joel, Brigui Olkalé, Jean-Claude, Yacoub Idriss, Halawlaw, and Kwato Njock, Moïse Godfroy more...
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GAMMA ray spectrometry , *NATURAL radioactivity , *SOIL testing , *GERMANIUM detectors , *ABSORBED dose - Abstract
The activity concentrations of natural radionuclides 226Ra, 232Th and 40K in 19 soil samples from Zabili uranium exploration area were measured using a low-background digital gamma-ray spectrometer equipped with broad energy germanium detector. The activity concentrations of 238U, 232Th, and 40K range from 16.5 to 1110.9 Bq.kg−1, 19.45 to 76.97 Bq.kg−1, and 3.28 to 839.5 Bq.kg−1, with their mean values of 478.0, 58.9, and 562.5, respectively. In addition, radiological hazard parameters from the activity concentrations obtained were assessed by estimating radium equivalent activity, external and internal hazard index, indoor and outdoor absorbed gamma dose rate and the corresponding annual effective dose, effective dose rate to different body organs and tissues, and excess lifetime cancer risk. Derived radiological hazard indices have been revised in accordance with relevant national and international legislation and guidelines. The radiological hazard parameter values were found to be above the relevant limit values for soils. In order to investigate the distribution of radionuclides and associated health hazard parameters in the study area, a statistical study was performed. [ABSTRACT FROM AUTHOR] more...
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- 2024
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17. Gamma‐Ray Spectrometry of Soil Samples From a Pilot Site of Uranium Anomaly in the Sahel Region of Burkina Faso.
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Beogo, Cedric E., Cisse, Ousmane I., Ansong, Martin, Zougmore, François, and Senapathi, Venkatramanan
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GAMMA ray spectrometry ,NATURAL radioactivity ,SOIL sampling ,ABSORBED dose ,CLAY soils - Abstract
The natural radioactivity level has been determined in a pilot site located at Solhan, in the Sahel region of Burkina Faso by means of gamma‐ray spectrometry in soil samples collected at a depth of 40 cm. The activity concentrations are estimated for 238U (range from 181.89 ± 3.62 to 191.37 ± 3.71 Bq·kg−1), 232Th (range from 44.92 ± 2.96 to 48.40 ± 3.25 Bq·kg−1), and 40K (range from 215.11 ± 6.13 to 238.60 ± 6.52 Bq·kg−1). The concentration of 238U present in these soil samples is five times higher than the world average, while the concentration of 232Th is almost the double of the world average. However, the concentration of 40K is particularly low in the study area, being almost half the world average. Additionally, calculations of the Th/K and Th/U ratios indicate the presence of a clay soil and insoluble uranium in the study area. These results made it possible to assess the radiological hazards on the human health. This allowed us to note that the average values of absorbed gamma dose rate in air (124.14 nGy·h−1), internal hazard index (1.24), annual effective dose equivalent (0.76 mSv·y−1), and excess lifetime cancer risk (5.34 × 10−4) are well above the maximum recommended limits. Only the mean values of radium equivalent activity (271.39 Bq·kg−1) and external hazard index (0.73) remain within the acceptable limit. [ABSTRACT FROM AUTHOR] more...
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- 2024
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18. The method of radiation risk assessment based on physico-geographical regionalisation: a case study of Carpathians, Poland.
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Jędrzejek, Filip, Szarłowicz, Katarzyna, and Stobiński, Marcin
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GAMMA ray spectrometry ,HEALTH risk assessment ,TERRESTRIAL radiation ,GEOGRAPHIC information systems ,ABSORBED dose - Abstract
Radiological assessment of the environment in expansive territories poses significant challenges due to the complexity of spatial and environmental variables. The aim of this study was to use and present the advantages of a physico-geographical regionalisation methodology to improve the precision and effectiveness of radiological assessments in large areas. The study area was a region of the Polish Carpathian mountains with a territory of 19,600 km
2 . By integrating geographic information systems (GIS) and radiological data, this research analysed a similarity of environmental attributes (soil type, lithology, mineralogy) and absorbed dose rate (ADR) level from the terrestrial origin for populations. Consistency in terms of the nature and origin of the relief and lithological diversity was a key aspect that distinguished the radiological characteristics. Therefore, consistency was observed at the macroregional level according to physiographic mapping. The study demonstrates the utility of macroregionalisation in capturing spatial ADR heterogeneity and provides a new strategy in radiological monitoring. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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19. Determination of certified values for Co, Cr, and Zn in lake sediment CRM (KRISS 109-05-002) using the INAA method.
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Cho, Hana, Dasari, Kishore B., Lim, Myung Chul, Hong, Seong Pyo, Sun, Gwang-Min, Heo, Sung Woo, and Lee, Kyoung-Seok
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LAKE sediment analysis , *GAMMA ray spectrometry , *LAKE sediments , *SEDIMENT sampling , *REFERENCE sources , *NUCLEAR activation analysis - Abstract
The standard calibrator–instrumental neutron activation analysis method was used to characterize the mass fractions of Co, Cr, and Zn in a lake sediment certified reference material (CRM) developed by the Korea Research Institute of Standards and Science. The method was validated for each element and sediment matrix, and the CRM analysis was repeated to ensure reproducibility and address potential matrix interferences. To verify measurement reliability, quality control samples were also assessed. For lake sediment samples with a small Zn peak and dominant adjacent peaks of Eu and Sc, sequential measurements were performed to obtain accurate Zn concentrations. The optimal measurement timing was when the Sc peak sufficiently decayed and the intensity of the Zn peak remained larger than that of Eu. Moreover, an appropriate fitting program capable of deconvoluting complex peak regions is necessary. [ABSTRACT FROM AUTHOR] more...
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- 2024
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20. Major and trace elements determination in organic and conventional Moroccan vegetables using the k0-standardisation method of neutron activation analysis.
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Said, Sanaa, Bounouira, Hamid, Amsil, Hamid, Aarab, Ilias, Badague, Abdelwahab, El Basraoui, Soufya, Moussaif, Ahmad, and Benazzouz, Bouchra
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NUCLEAR activation analysis ,GAMMA ray spectrometry ,GAMMA ray spectroscopy ,NUCLEAR energy ,RESEARCH reactors - Abstract
The aim of the present work is the determination of different essential (minor and trace) elements found in five Moroccan vegetables collected from large commercial markets in Kenitra city, Morocco, and in some organic vegetables which were traditionally grown without the use of pesticides or chemical fertilizers, in a plot located in the rural commune of Dar Laaslouji, 48 km from Kenitra city. The k0-standardisation method of the Neutron Activation Analysis (k0-INAA) using the TRIGA Mark II research reactor of 2 MW at the National Centre for Nuclear Energy, Science and Technology (CNESTEN) and gamma-ray spectroscopy facility were employed. For quality control, the accuracy of measurements has been investigated using certified reference materials (IAEA-336 lichens, and NIST SRM 1547 peach leaves) which were analyzed simultaneously with the samples. Good agreement was found between certified and determined values. The primary results are presented and discussed for the concentration of minor and trace elements in some vegetables (tomatoes, carrots, green peppers, cilantro and mint), that are widely used in Moroccan meals. [ABSTRACT FROM AUTHOR] more...
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- 2024
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21. Evaluation of radioactivity and radiological parameters in soil samples in Isparta, Türkiye
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Mehmet Ertan Kürkçüoğlu, Fatih Çağlar Kahraman, Serdar Dizman, and Gülçin Bilgici Cengiz
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Isparta ,Soil ,Natural radioactivity ,Gamma-ray spectrometry ,Radiological risk parameters ,Nuclear engineering. Atomic power ,TK9001-9401 - Abstract
In the city centre of Isparta, located in the southwestern part of Türkiye, indoor radon concentrations and gamma dose rate levels were observed above the world and country averages. For this reason, the determination of the natural radioactivity levels in soil samples of Isparta province is of great interest. In the present study, the activity concentrations of radionuclides (namely 226Ra,232Th, 40K and 137Cs) were investigated in the soil samples collected from 72 different points including the city centre and 12 towns of Isparta by using a gamma spectrometer with a high-purity germanium (HPGe) detector. The activity concentrations of 226Ra,232Th, 40K and 137Cs radionuclides in the samples were found in the range of 4.08 ± 0.39–69.84 ± 1.43 Bqkg−1, 2.63 ± 0.28–65.66 ± 1.41 Bqkg−1, 44.48 ± 3.17–452.38 ± 9.65 Bqkg−1 and 0.28 ± 0.18–19.10 ± 0.61 Bqkg−1 respectively. The averages of all the measurements were determined as 15.69 ± 0.72 Bqkg−1 for 226Ra, 15.40 ± 0.78 Bqkg−1 for 232Th, 210.60 ± 6.22 Bqkg−1 for 40K and 3.44 ± 0.31 Bqkg−1 for 137Cs. Although these values were below the country and world averages, it was revealed that the 226Ra and 232Th activity concentrations in the city centre exceeded the national and world averages. In addition, radiological risk maps of the analysed radionuclides were produced for the first time, covering all towns within the Isparta province. To evaluate the radiological hazards resulting from natural radionuclides, external hazard index (Hex), absorbed dose rate (D), annual effective dose equivalent (AEDE), male and female lifetime cancer risk (LCR) values were also calculated. The outcomes of this study revealed that all the radiological parameter averages for Isparta were lower than the world and country averages but the calculation results for the city centre displayed the opposite of this situation except for the external hazard index. more...
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- 2024
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22. Study on the behavior of radionuclides in geologic samples from fault zone, Gabal Um Hamd, southwestern Sinai, Egypt
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Doaa M. El Afandy, Eman M. Ibrahim, Ibrahim E. El Aassy, and H.A. Abdel Ghany
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Gamma-ray spectrometry ,Natural radioactivity ,U-series dating ,Gabal Um Hamd ,Nuclear engineering. Atomic power ,TK9001-9401 - Abstract
The present study concerned with the activity concentrations of natural radionuclides (238U, 234U, 230Th, 226Ra, 232Th, 40K and, 235U) in ten sedimentary rock samples collected from fault zone, Gabal Um Hamd, southwestern Sinai, Egypt. These samples were investigated to study their behavior during a part of geologic time. The activity concentrations were measured using γ-ray spectrometry (HPGe detector). The investigated samples were analyzed for major oxides using the XRF technique. The results demonstrated high average activity concentrations of 238U, 234U, 230Th, 226Ra, 232Th, 40K and, 235U than the worldwide average values as reported by UNSCEAR 2008. Theil diagram showed that there are accumulation and leaching of uranium in some samples in the two sides of the fault zone. It is noticed that the ages of uranium depositions for the samples collected from the downthrown of the fault zone vary from 121.5 to 440.1 ky, while for the sample collected from the upthrown of the fault is 210.9 ky. The 230Th/232Th activity ratios range between 4.55 and 91.04 for downthrown samples and between 4.75 and 6.05 for upthrown samples which are smaller than 20 except for two samples, indicating a contamination of the samples by detrital 230Th. After subtraction of the detrital 230Th, the corrected ages for downthrown samples vary from 119.1 to 231.7 ky while for upthrown samples vary from 164.4 to 390 ky. more...
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- 2024
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23. Dragonflies (Odonata) as bioindicators of radioactivity.
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Vukoja, Andrea, Bogdanović, Tomislav, Rašeta, Davor, Miljanić, Nora, Ivanišić Risek, Iva, Ilić, Krunoslav, Pavičić, Ivan, Marjanović Čermak, Ana Marija, and Petrinec, Branko
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GAMMA ray spectrometry , *GERMANIUM radiation detectors , *BIOSPHERE reserves , *BIOINDICATORS , *ENVIRONMENTAL monitoring - Abstract
Bioindicators are living organisms that are successfully used for monitoring changes in the environmental health due to natural and/or anthropogenic influences. Dragonflies (Odonata) are considered to be good indicators of water quality; however, research on dragonflies as potential indicators of radioactivity is scarce. The aim of this study was to evaluate dragonflies as potential biological indicators of ionising radiation in nature by measuring 137Cs activity concentrations in the dragonfly and river water samples. Altogether, 11 collective samples of dragonflies were collected from the bank of the Mura–Drava–Danube Biosphere Reserve, in the area of Virovitica–Podravina County. Following the initial sample preparation, the gamma spectrometry technique, employing an ORTEC HPGe detector system, was utilised to determine the activity concentrations of 137Cs. The results show that the activity concentrations of 137Cs in the river water were in the range from 4 to 13 Bq/m3. The results of dragonfly samples showed that 137Cs was in the range from 1.7 to 3 Bq/kg. This was more than a hundred times higher than in the river Drava water. According to the obtained results, we conclude that dragonflies could be used as potential bioindicators of radioactivity. [ABSTRACT FROM AUTHOR] more...
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- 2024
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24. Addressing challenges of high-energy atmospheric physics in Europe.
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Ploc, O., Kákona, M., Sommer, M., Šlegl, J., Kákona, J., Velychko, O., Lužová, M., and Ambrožová, I.
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ATMOSPHERIC radiation , *GAMMA ray spectrometry , *ATMOSPHERIC physics , *GAMMA rays , *GLOBAL radiation , *THUNDERSTORMS - Abstract
Thunderstorm-induced gamma radiation phenomena, including terrestrial gamma-ray flashes (TGFs) and thunderstorm ground enhancements (TGEs), have emerged as key areas in high-energy atmospheric physics due to their potential radiation effects in the atmosphere. The interaction of high-energy photons and relativistic electrons with the air can lead to complex radiation processes, influencing local and global atmospheric radiation fields. Developing specialized gamma-ray spectrometers is essential in regions like Central Europe, where environmental and technical challenges differ from those in Japan or Asian high-altitude areas. This paper describes the necessary adaptations for gamma spectrometry in such environments, focusing on sensitivity to high-energy photon detection, rapid event timing, and integration into distributed measurement networks. Results from field deployments at high-altitude observatories and thunderstorm chase events provide new insights into the radiation dynamics of TGEs, contributing to a better understanding of radiation effects in the air during thunderstorms in continental climates. [ABSTRACT FROM AUTHOR] more...
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- 2024
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25. Assessment of radioactivity levels in soil of coastal dwellings in Odisha and Andhra Pradesh, India.
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Kumar, N. S. Siva, Raju, M. Kumar, Ratnaraju, M., Satyanarayana, G. V. V., VidyaSagar, D., and Das, N. Lakshmana
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GAMMA ray spectrometry , *ABSORBED dose , *RADIOACTIVITY , *RADIATION , *SOILS - Abstract
The activity concentrations of 238U, 232Th, and 40K were determined at 56 sites along the East Coast of India, near the Bay of Bengal, with 31 sites in Odisha and 25 in Andhra Pradesh. In Odisha, average concentrations were 109 ± 13 Bq kg−1 for 238U, 296 ± 27 Bq kg−1 for 232Th, and 450 ± 33 Bq kg−1 for 40K, while in Andhra Pradesh, they were 51 ± 13 Bq kg−1, 149 ± 16 Bq kg−1, and 236 ± 21 Bq kg−1, respectively. Absorbed dose rates and annual effective doses were higher outdoors and indoors in Odisha compared to Andhra Pradesh. The calculated radiological parameters exhibited elevated values at certain sampling locations; however, overall, the values generally complied with regulatory standards. [ABSTRACT FROM AUTHOR] more...
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- 2024
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26. Relationship between radium isotopes and their chemical analogues in a hot spring area in Taiwan.
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Huang, Feng-Yun J., Chang, Feng-Chih, Chuang, Chun-Yu, Kuo, Chun-Liang, Lin, Chun-Chih, Hsieh, Ling-Ling, and Chao, Jiunn-Hsing
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GAMMA ray spectrometry , *HOT springs , *RADIUM isotopes , *REGRESSION analysis , *LINEAR statistical models - Abstract
A gamma-ray spectrometry was used to measure radium isotopes in a radium-enriched hot spring area. The activity of 224Ra was highly correlated with 228Ra in water caused by their same chemical behavior and the origin of the decay series chain. Besides, the radioactivity between radium isotopes (226Ra, 228Ra) and the selected chemical analogues in sludge exhibited moderate (Ba and Sr) to strong (Pb) correlations according to linear regression analysis. In contrast, there is less correlation between radium isotopes and 40K. These results reveal that radium isotopes may be transported and distributed together in the environment. [ABSTRACT FROM AUTHOR] more...
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- 2024
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27. Determination of 40K radionuclide concentration and elements content in some animal feeds.
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Eke, Canel
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ANIMAL feeds ,TECHNICAL reports ,RADIOISOTOPES ,COPPER ,RADIATION exposure - Abstract
The study of radionuclide concentrations is significant for the exposure of the radiation on the livings from these radionuclides and they are transferred from plants, animals to livings, and this is important for the health of livings. In this paper, 40K concentration and elements content of wheat, barley, corn, and chick feeds, which are used as animal feed using gamma‐ray spectrometry and inductively coupled plasma‐optical emission spectrometry (ICP‐OES) were examined. The animal feeds were obtained from two different sellers for representative and to be able to compare the obtained results from studied animal feeds. The mean value of 40K radionuclide concentration for wheat, barley, and corn is smaller than the world mean value whereas it is higher for chick feeds than the world mean value. The Hin, Hex, and Iγ of studied animal feeds are lower than limit value reported in the scientific report. There are positive and significant correlations between K, Ca, Fe, Mg, Na, P, and 40K at the 0.01 level and between Cu, Mn, Ni, Zn, and 40K at 0.05 level. [ABSTRACT FROM AUTHOR] more...
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- 2024
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28. Assessment of physicochemical properties and radioactivity in groundwater at households living in bac Lieu province, vietnam.
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Ho, Phan Long, Hung, Le Dinh, Minh, Vu Tuan, Thanh, Nguyen Tran Bao, Van Chinh, Dang, Minh, Le Hoang, Thanh, Tran Thien, and Van Tao, Chau
- Abstract
This paper presents findings on groundwater physiochemical composition and radioactivity levels in households in Bac Lieu province, Vietnam. Through discriminant analysis, it was observed that groundwater quality exhibits spatial variations corresponding to saline intrusion zones. The paired-samples T-tests revealed significantly different ratios of Ra-224, Ra-226, and Ra-228 isotopes between Na–Cl and Ca–Na–HCO
3 water types. All three water types had a ratio of Ra-226/Ra-228 of approximately one, indicating the presence of groundwater aquifers beneath the crust and fluvial marine sediment. Furthermore, strong associations between sulfate and calcium suggest that CO2 enrichment in groundwater aquifers indicates anoxic aquatic environments. Twenty-five of the thirty-three evaluated samples exceeded the national technical regulations for domestic water quality with parameters such as chloride, sulfate, sodium, gross alpha, or total dissolved solids. Fifteen samples exceeded gross alpha's allowable contamination threshold of 0.1 Bq/L. The combination of Ra-226 and Ra-228 did not surpass the U.S. Environmental Protection Agency's recommended limit of 0.185 Bq/L. However, nineteen samples exhibited annual committed effective doses of radium isotopes for infants that exceeded the WHO recommendation of 0.1 mSv/year. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
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29. Current state of natural and artificial radiation in the Eastern Black Sea Coast of Türkiye (Trabzon–Rize–Artvin) 38 years after Chernobyl
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Uzun Duran, Selcen
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- 2025
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30. A multi-disciplinary approach for uranium exploration using remote sensing and airborne gamma-ray spectrometry data in the Gebel Duwi area, Central Eastern Desert, Egypt
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Mahmoud Abd El-Rahman Hegab
- Subjects
Uranium exploration ,Gebel Duwi ,Multispectral remote sensing ,Gamma-ray spectrometry ,Medicine ,Science - Abstract
Abstract Uranium exploration plays a pivotal role in meeting global energy demands and advancing nuclear technology. This study presents a comprehensive approach to uranium exploration in the Gebel Duwi area of the Central Eastern Desert of Egypt, utilizing remote sensing and airborne gamma-ray spectrometric data. Multispectral remote sensing techniques, including Principal Component Analysis (PCA), Minimum Noise Fraction (MNF), and Band Ratioing (BR), are employed to identify lithological units and hydrothermal alteration zones associated with uranium deposition, such as iron oxides, argillic, propylitic, and phyllic alterations. Additionally, airborne gamma-ray spectrometry data provide insights into the spatial distribution of radioelements, including uranium (eU), thorium (eTh), and potassium (K), as well as radioelement ratios (eU/eTh, eU/K, and eTh/K). The uranium migration index map (eU-(eTh/3.5)) and the F-parameter map (K*(eU/eTh)) have been generated to investigate the movement of uranium within various geological zones and characterize anomalous uranium concentrations. Statistical analyses, including mean (X), standard deviation (S), and coefficient of variability (C.V.), are conducted to identify uranium-rich zones. The integration of these datasets enables the generation of a uranium potential map highlighting areas of elevated concentrations indicative of uranium mineralization. Field observations and mineralogical analyses of collected samples validate our findings, confirming the presence of minerals associated with uranium mineralization in mapped high-potential areas. The significance of minerals like Fe-Chlorite, Fe-Mg-Chlorite, ferrihydrite, goethite, calcite, muscovite, dolomite, actinolite, vermiculite, and gypsum in indicating potential uranium mineralization processes underscores the importance of our results. more...
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- 2024
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31. A multi-disciplinary approach for uranium exploration using remote sensing and airborne gamma-ray spectrometry data in the Gebel Duwi area, Central Eastern Desert, Egypt.
- Author
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Hegab, Mahmoud Abd El-Rahman
- Subjects
AIRBORNE-based remote sensing ,REMOTE sensing ,URANIUM ,HYDROTHERMAL alteration ,PRINCIPAL components analysis ,URANIUM ores - Abstract
Uranium exploration plays a pivotal role in meeting global energy demands and advancing nuclear technology. This study presents a comprehensive approach to uranium exploration in the Gebel Duwi area of the Central Eastern Desert of Egypt, utilizing remote sensing and airborne gamma-ray spectrometric data. Multispectral remote sensing techniques, including Principal Component Analysis (PCA), Minimum Noise Fraction (MNF), and Band Ratioing (BR), are employed to identify lithological units and hydrothermal alteration zones associated with uranium deposition, such as iron oxides, argillic, propylitic, and phyllic alterations. Additionally, airborne gamma-ray spectrometry data provide insights into the spatial distribution of radioelements, including uranium (eU), thorium (eTh), and potassium (K), as well as radioelement ratios (eU/eTh, eU/K, and eTh/K). The uranium migration index map (eU-(eTh/3.5)) and the F-parameter map (K*(eU/eTh)) have been generated to investigate the movement of uranium within various geological zones and characterize anomalous uranium concentrations. Statistical analyses, including mean (X), standard deviation (S), and coefficient of variability (C.V.), are conducted to identify uranium-rich zones. The integration of these datasets enables the generation of a uranium potential map highlighting areas of elevated concentrations indicative of uranium mineralization. Field observations and mineralogical analyses of collected samples validate our findings, confirming the presence of minerals associated with uranium mineralization in mapped high-potential areas. The significance of minerals like Fe-Chlorite, Fe-Mg-Chlorite, ferrihydrite, goethite, calcite, muscovite, dolomite, actinolite, vermiculite, and gypsum in indicating potential uranium mineralization processes underscores the importance of our results. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
32. Reviewing the Role of the Radiological Characterization Laboratory in Nuclear Facility Decommissioning.
- Author
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GURAU, D.
- Subjects
- *
NUCLEAR facility decommissioning , *NUCLEAR research , *GAMMA ray spectrometry , *NUCLEAR engineering , *NUCLEAR physics - Abstract
The process of radiological characterization involving all the systems, structures, equipment, and components resulting from the decommissioning of the VVR-S nuclear research reactor at the Horia Hulubei National Institute for Physics and Nuclear Engineering was a continuous journey marked by ongoing research, specialized training, and the accumulation of invaluable experience. Recognizing the significance of protecting the expertise gained during this effort, this paper aims to share several key insights collected from the radiological characterization process. In particular, the focus is placed on elucidating various methodologies and techniques utilized in gamma-ray spectrometry. The aim of delving into these specific aspects is to offer practical lessons that can serve as valuable guidance for future efforts in radiological characterization within similar contexts. Through the dissemination of these insights, it is hoped that the collective knowledge and expertise amassed during the radiological characterization of the VVR-S nuclear research reactor decommissioning can be effectively preserved and utilized for the benefit of future projects in the field. [ABSTRACT FROM AUTHOR] more...
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- 2024
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33. 37 years after the chernobyl: the current radiation status in Kocaeli, Turkey.
- Author
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Günay, Osman, Yalçin, Caner, Güray, R. Taygun, Avci Karakurt, Didem, Tantoğlu, Ezgi, and Başdemir, Safa
- Subjects
- *
CHERNOBYL Nuclear Accident, Chornobyl, Ukraine, 1986 , *GAMMA ray spectrometry , *BACKGROUND radiation , *ABSORBED dose , *SOIL pollution - Abstract
This study aims to assess the artificial and natural radiation dose levels in certain districts of Kocaeli province within the Marmara region, 37 years after the Chernobyl nuclear accident, and evaluate the current status prior to potential nuclear leakage events from Zaporijya or other nuclear power plants. Radioactive concentrations of 232Th, 238U, 40K and 137Cs were determined using HPGe gamma spectrometry in 26 soil samples collected from the region of interest. The average concentrations were found to be 22.35 Bqkg−1 for 238U, 26.36 Bqkg−1 for 232Th, 368.34 Bqkg−1 for 40K, and 2.44 Bqkg−1 for 137Cs. Furthermore, the study revealed an absorbed dose rate of 41.73 nGyh−1, an annual effective dose equivalent of 51.18 µSvy−1, and an excess lifetime cancer risk of 0.00018. [ABSTRACT FROM AUTHOR] more...
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- 2024
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34. The current status of natural and artificial radiation in İstanbul 36 years after chernobyl, preceding a potential nuclear threat.
- Author
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Günay, Osman, Özden, Selin, and Aközcan Pehlivanoğlu, Serpil
- Subjects
- *
BACKGROUND radiation , *GAMMA ray spectrometry , *NATURAL radioactivity , *GERMANIUM radiation detectors , *SOIL pollution - Abstract
In this study, the current status of natural and artificial radioactivity levels in soil samples from the Büyükçekmece and Silivri districts of Istanbul, as well as the Marmara Ereğlisi district in Tekirdağ, has been determined in anticipation of a potential nuclear leakage (e.g. the Zaporizhzhia Nuclear Power Plant). Twenty soil samples were collected from the study area, and the radioactivity concentrations of 226Ra, 232Th, 40K and 137Cs were measured using an HPGe detector. The average concentrations of 226Ra, 232Th, 40K and 137Cs were found to be 26 ± 2, 30 ± 2, 540 ± 29, 0.55 ± 0.07 Bq kg−1, respectively. [ABSTRACT FROM AUTHOR] more...
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- 2024
- Full Text
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35. Assessment of Natural Radioactivity and Monitoring of Radiological Hazards in Construction Materials from Kerala, India.
- Author
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Vishnu C. V. and Joseph, Antony
- Subjects
NATURAL radioactivity ,CONSTRUCTION materials ,RADIATION exposure ,GAMMA ray spectrometry - Abstract
Evaluating the natural radioactivity in construction materials is significant, particularly considering the prevailing belief that our homes offer the safest living environments. To investigate this, 38 samples of building materials were collected from highly populated residential areas within the Malappuram district in Kerala, India. The levels of naturally occurring radionuclides (
226 Ra,232 Th, and40 K) were quantified using a NaI (Tl) detector. Radiological indices, such as radium equivalent, absorbed dose rate, effective dose rate, hazard indices, alpha index, gamma index, and cancer risk, were calculated for the samples. The activity concentrations of226 Ra,232 Th, and40 K ranged from 8.84 ± 0.3 (flooring oxide) to 46.84 ± 2.11Bq/kg (rock samples), 11.84 ± 0.2 (pumice sample) to 130.21 ± 8Bq/kg (granite sample), and 58.63 ± 4 (pumice) to 1024.32 ± 22Bq/kg (granite) with an average of 25.80 ± 4.61, 55.05 ± 6.2, and 392.30 ± 16 Bq/kg. (average ± standard deviation), respectively. As a result, all of these computed parameters fell within safe limits. The examined building materials were found to have a negligible impact on radiation exposure, posing no significant radiation risks to residents. Researchers utilized statistical techniques to understand the interrelationships and similarities among radionuclides and radiological characteristics across samples, including Pearson correlation, principal component analysis, and cluster analysis. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
36. The role of gamma-ray spectrometry and Monte Carlo simulation in the characterisation of meteorites.
- Author
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Rossini, Riccardo, Cremonesi, Oliviero, Cataldo, Matteo, Di Martino, Daniela, Laubenstein, Matthias, and Clemenza, Massimiliano
- Subjects
- *
MONTE Carlo method , *METEORITES , *RADIOISOTOPES - Abstract
Gamma-ray spectrometry has proved to be a powerful tool in meteorite identification due to the presence of certain mid- and long-lived cosmogenic radionuclides in such samples. In particular, this technique can be made totally non-destructive by measuring each sample as-it-is and calculating the full-energy-peak efficiency through Monte Carlo simulation of the full radionuclide decay. In general, this framework can be applied whenever it is needed to characterise non-destructivery the γ-ray emission of a sample with non-standard geometry. [ABSTRACT FROM AUTHOR] more...
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- 2024
- Full Text
- View/download PDF
37. Essential and toxic elements determination in Ampelodesma mauritanicum plant based on gamma-ray spectrometry.
- Author
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Moulai, Nasr Eddine, Beladel, Brahim, Malki, Abderahim, Ararem, Abderrahmane, Brahimi, Abdelkarim, Rebhi, Fayçal, Ouanezar, Abdelkader, Lammouri, Rahima, and Messaoudi, Mohammed
- Subjects
- *
NUCLEAR activation analysis , *POISONS , *TRACE elements , *CHEMICAL elements , *WATER purification , *CHROMIUM - Abstract
Due to the scarcity of data on both basic and toxic chemical elements in medicinal and fodder plants in Algeria, this study focused on evaluating the content of these elements in the Ampelodesma mauritanicum plant grown in the Ghardaia region of Southern Algeria. This plant is commonly used by Bedouins in traditional medicine and as fodder, and has applications in construction, decontamination, and water purification. Based on gamma-ray spectrometry for neutron activation analysis, the study identified and categorized a total of 25 mineral and trace elements into essential, non-essential, and potentially toxic groups. Essential elements exhibited varying concentrations, with potassium being the most abundant, followed by sodium, calcium, iron, zinc, chromium, cobalt, and selenium. The study also assessed potentially toxic elements, all found below the estimated permissible limits established by FAO/WHO. Quality control was ensured through the analysis of certified reference materials. The findings provide valuable insights into the elemental composition of Ampelodesma mauritanicum, offering significant implications for medicinal and nutritional applications while ensuring analytical accuracy and reliability. [ABSTRACT FROM AUTHOR] more...
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- 2024
- Full Text
- View/download PDF
38. Detector efficiency calibration using 88Rb point source.
- Author
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Coşar, C. and Luca, A.
- Subjects
- *
RUBIDIUM , *MONTE Carlo method , *SCINTILLATION counters , *GERMANIUM radiation detectors , *GAMMA rays , *CALIBRATION - Abstract
A coaxial type HPGe detector, and two lanthanide scintillation type detectors have been modeled and characterized by means of Monte Carlo method implemented using the MCNP code. The isotope of interest is 88Rb which decays with energies up to 5 MeV, and can in theory aid in extending the efficiency calibration of the installations of interest in higher gamma rays energies. An 152Eu point source was used for the experimental validation of the MCNP models and excellent agreement was observed between the experimental data and the simulated data of both 152Eu and 88Rb point sources. After the experimental validation of the model, the efficiency calibration was extended for three different source-to-detector distances and the results are presented in this work. [ABSTRACT FROM AUTHOR] more...
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- 2024
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39. A study of radon exhalation rates and activity concentration of 226Ra, 232Th and 40K in soil samples of Roopnagar district, Punjab, India.
- Author
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Mehta, Vimal, Kaur, Rupinderjeet, Shikha, Deep, and Singh, Supreet Pal
- Subjects
- *
SOIL sampling , *RADON , *NATURAL radioactivity , *GAMMA ray spectrometry , *RADIOISOTOPES - Abstract
This study aimed to estimate the, exhalation rate, and natural radioactivity in the soil of Roopnagar district, Punjab. The radon mass and surface exhalation rate ranged from 1.18 mBq kg−1 h−1 to 5.72 mBq kg−1 h−1, with an average value of 2.68 mBq kg−1 h−1, and from 4.89 mBq m−2 h−1 to 23.58 mBq m−2 h−1, with an average value of 11.09 mBq m−2 h−1, respectively. The activity concentration of 226Ra, 232Th, and 40K was found to be 31.9 Bq kg−1, 44.1 Bq kg−1, and 419.0 Bq kg−1, respectively. The air absorbed dose rates of radionuclides 226Ra, 232Th, and 40K had an average value of 14.88 nGyh−1, 27.4 nGyh−1, and 5.89 nGyh−1, respectively. The total air absorbed dose from all radionuclides ranged from 19.5 nGyh−1 to 87.7 nGyh−1, with an average value of 48.1 nGyh−1, which is discovered to be well below the levels considered dangerous by the United Nations Scientific Committee on the Effects of Atomic Radiations. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
40. Comparative Study of Radiation Mapping Technologies for Nuclear Disaster Assessment.
- Author
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Ochi, Kotaro, Barker, Evelyne, Nakama, Shigeo, Gleizes, Marc, Manach, Erwan, Faure, Vincent, and Sanada, Yukihisa
- Subjects
GEOGRAPHIC information systems ,FUKUSHIMA Nuclear Accident, Fukushima, Japan, 2011 ,NUCLEAR power plants ,NUCLEAR accidents ,NUCLEAR energy ,HAZARDOUS waste sites ,RURAL geography ,CRISIS management ,THERMOLUMINESCENCE dating - Abstract
The distribution of the ambient dose equivalent rate (i.e., air dose rate) after a nuclear disaster is crucial for zoning contaminated areas to facilitate authorities' effective decision making. Several countries are considering a gradual characterization strategy where airborne measurement is performed first followed by ground measurement (i.e., via manborne or carborne surveys). Nonetheless, potential differences might emerge in country-specific air dose rate assessment methods. Explaining these discrepancies can improve and converge existing methodologies. The Japan Atomic Energy Agency (JAEA) and the French Institute for Radiological Protection and Nuclear Safety (IRSN), which are organizations involved in post-nuclear accident crisis management, jointly performed air dose rate measurements in 2019 at contaminated sites around the Fukushima Daiichi Nuclear Power Station. The similarities and differences between the two organizations' methods and results were quantitatively assessed by comparing the average air dose rates obtained within a grid created with a geographic information system, and the reasons for the differences between the organizations' results were investigated. The air dose rates obtained by the manborne measurements varied depending on the calibration method. Comparing the air dose rate assessment methods and mapping techniques used in different countries will contribute to developing international guidelines for recommending the best method for determining air dose rates. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
41. Simulation of p‑type HPGe detector full‑energy peak efciency using GEANT4 Monte Carlo toolkit.
- Author
-
Penabeï, S., Bongue, D., Mistura, A. B., Maleka, P., K. M., K. M., and Kwato, G. N. M.
- Abstract
Accurate quantitative analysis of environmental samples in laboratory settings requires knowledge of the full-energy peak (FEP) efciency for the source-detector geometries used. However, experimental determination of this parameter may prove restrictive and time-consuming. To address this issue, a Monte Carlo method based on the GEANT4 code was developed to calculate the FEP efciency of a Canberra coaxial p-type HPGe detector, tailored for 100 ml geometry sample confguration. This simulation was used to determine the FEP efciency for diferent energy levels relevant to the analysis of environmental samples. The results obtained from the Monte Carlo simulation were compared to the experimental measurements conducted under identical simulation initialization conditions. The obtained deviations (%) between simulations and experimental measurements were reliable in most cases with a maximum error of 4.17%. The proposed model exhibits a high degree of fexibility, enabling its application to diverse geometric confguration of samples. This adaptability allows for the determination of calibration coefcients across a wide range of energy, thereby enhancing the overall precision and adaptability of the analysis process for environmental samples. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
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42. Study on distribution of radionuclides in soil and pottery samples of archaeological sites of eastern India.
- Author
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Naskar, Nabanita, Shaha, Chandrima, Ghosh, Ahana, and Gangopadhyay, Kaushik
- Subjects
- *
SOIL sampling , *ARCHAEOLOGICAL excavations , *RADIOISOTOPES , *DATA distribution - Abstract
The present study reports the first data on NORM distribution in soil and pottery samples collected from excavated sites of Erenda (Trench A1) and Bahiri (Trench YB1) located in East Medinipur, West Bengal, India. Collected potteries include grey-wares, red-wares, black-wares and black-red-wares. It was observed that 238U and 40K activities of the pottery samples are higher than that of the soil samples, which might be an indication of their different origin. 232Th activity is uniform along the depth and has similar distribution in both soil and pottery samples of Erenda and Bahiri. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
43. Assessment of Natural Radioactivity Concentration in Soils from Irrigation Farming Areas within Kudan Local Government Area, Kaduna State, Nigeria
- Author
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Hayatu Umar, Gazara A Bala, Yusuf Ayuba, and Mustapha Shafiu
- Subjects
activity concentration ,gamma-ray spectrometry ,radiation ,soil ,irrigation ,Physics ,QC1-999 - Abstract
The activity concentrations of natural radionuclides 238U, 232Th and 40K in soil samples from Kudan Local Government Area irrigation farming areas have been evaluated using gamma-ray spectrometry. The results of the activity concentrations of 238U, 232Th and 40K range between 18.15 to 34.66 Bq/kg, 16.01 to 18.83 Bq/kg and 205.51 to 461.25 Bq/kg respectively. The activity concentration of 40K was seen to be higher than the world average value of 370 Bq/kg at Kauran Wali South (GO3K) 375.25 Bq/kg, Doka (GB1K) 389.60 Bq/kg, Kauran Wali North (GB2K) 420.15 Bq/kg, Likoro (GB4K) 383.65 Bq/kg, Garu (GB5K) 461.25 Bq/kg, Zabi (GB6K) 372.76 Bq/kg and Kudan (GB7K) 382.50 Bq/kg. The activity concentrations of 238U and 232Th were observed to be high at Garu (GB5K), with values of 34.66 and 18.83 Bq/kg respectively, however, these values were still below the world average value of 40 Bq/kg as reported by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSEAR) in 2000. The average values for the indoor absorbed dose rate (Din), Internal Hazard Index (Hin), External Hazard Index (Hex) and Indoor Annual Effective Dose (ADE) were evaluated to be 83.07 nGy/hr, 0.35, 0.28 and 0.41 mSv respectively. The estimated radiological indices were seen to fall within the internationally acceptable limits except for the indoor absorbed dose rate (Din) whose values were all higher than the acceptable limit of 60 nGy/hr as recommended by UNSCEAR in 2000. The high values obtained from this study could be attributed to the excessive use of fertilizers by the farmers within the study area. more...
- Published
- 2023
- Full Text
- View/download PDF
44. Radioactivity of Surface Marine Sediments of Chaun Bay: Analysis of Natural and Anthropogenic Factors.
- Author
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Ulyantsev, A. S., Ivannikov, S. I., Bratskaya, S. Yu., and Charkin, A. N.
- Abstract
The paper presents data on the spatial distribution of the active concentration of natural (
232 Th,226 Ra, and40 K) and anthropogenic (137 Cs) radionuclides in the surface layer of bottom sediments in Chaun Bay of the East Siberian Sea. The measured active concentration of232 Th and226 Ra was typical of bottom sediments of the Arctic coastal shelf zone and corresponded to the global level. The level of137 Cs activity in bottom sediments showed the absence of local sources of anthropogenic pollution in Chaun Bay, while the mean40 K activity concentration was 1.8 times higher than the global. The results of statistical analysis of the data obtained showed that the dynamics of river runoff, thermal abrasion, and currents, as well as aeolian and ice transport of sedimentary matter, were the main factors that determined the differences in the behavior of the studied radionuclides in the surface bottom sediments of Chaun Bay. [ABSTRACT FROM AUTHOR] more...- Published
- 2024
- Full Text
- View/download PDF
45. Assessment of natural radioactivity and radiological impacts in several beaches of Kadikoy, Istanbul.
- Author
-
Günay, Osman
- Subjects
- *
RADIOACTIVITY , *NATURAL radioactivity , *RADIATION exposure , *BACKGROUND radiation , *DISEASE risk factors , *POPULATION density , *BEACHES - Abstract
Natural radioactivity (226Ra, 232Th, and 40K) concentrations were determined in sand samples collected from various beaches in Kadıköy-Istanbul (Turkey) at 12 sampling point for the evaluation of radiological parameters such as radiological equivalent activity and excess lifetime cancer risk. The activity concentrations of 226Ra, 232Th, and 40K were found to range between 21.08 and 49.19 Bqkg−1, 20.51–49.92 Bqkg−1, and 173.70–554.16 Bqkg−1, respectively. The selection of İstanbul as the study area is based on its high population density, indicating an increased vulnerability to potential negative effects of radiation exposure. [ABSTRACT FROM AUTHOR] more...
- Published
- 2024
- Full Text
- View/download PDF
46. Association of 241Am and 137Cs in finer size-fractioned saltmarsh sediments from north-west England, UK and potential health risk to coastal population.
- Author
-
Rahman, Rubina and Plater, Andrew J.
- Subjects
- *
SALT marshes , *SEDIMENTS , *DRILL core analysis , *PARTICULATE matter , *CESIUM , *CONTAMINATED sediments , *RADIOISOTOPES - Abstract
This study provides an in-depth analysis of the relationship between radionuclide and particle size-class abundance through an investigation of radionuclide distribution in finer sediments within surface core samples collected from two contaminated upper saltmarsh areas of the Dee estuary and Biggar marsh in north-west England. The particle size fractionation (PSF) analysis was carried out following gravitational settling and pipette method to separate all samples into six size-fractioned groups ranging from 63 to <2 µm (very coarse silt to clay), and radioactivity analysis was performed using a well-type High Purity Germanium (HPGe) detector. The highest 241Am and 137Cs activities in PSF samples were found to be 291 ± 5 and 2071 ± 16 Bq kg−1, respectively, for the Dee estuary saltmarsh and 3832 ± 14 and 4840 ± 23 Bq kg−1, respectively, for Biggar saltmarsh and found in the clay fractions for both sites. Correlation of radioactivity concentration data of three size groups ranging from 63 to <2 µm (very coarse silt to clay) confirms a strong and increasing association of radioactivity with fine particles from coarse to fine clay-size particles. Also, examination of textural and radionuclide data of all bulk core and size-fractioned samples revealed that upper saltmarshes are made up of both contaminated and uncontaminated sediments. Furthermore, the annual outdoor external effective dose range for all short core data (0.001–0.11 mSv y−1) and for PSF sample data (0.001–0.08 mSv y−1) reveal that some values exceed the world average value of 0.07 mSv y−1as reported in UNSCEAR [43], for outdoor, which are non-negligible. Thus, the total annual external effective dose associated with existing contaminated saltmarsh sediments represents a possible health risk to saltmarsh users and coastal populations living nearby these saltmarshes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
47. METHOD DEVELOPMENT FOR IN-SITU RADIOLOGICAL CHARACTERIZATION OF OIL-BASED MUD ORIGINATING FROM OIL INDUSTRY.
- Author
-
NTALLA, Eleni, CLOUVAS, Alexandros, and SAVIDOU, Anastasia
- Subjects
- *
GAMMA ray spectrometry , *SCINTILLATORS , *PETROLEUM industry , *MUD , *PETROLEUM waste , *RADIOACTIVE substances - Abstract
Oil-based mud is one of the primary wastes produced in oil industries that may contain elevated amounts of naturally occurring radioactive material. In this study, MCNPX simulations and gamma-ray spectrometry measurements were combined and a quick and sensitive method was developed for the non-destructive radiological characterization of spent oil-based mud originating from the oil industry by using a 3.81 cm x 3.81 cm LaBr3(Ce) scintillator. By this method, one cubic meter of packaged oil-based mud can be radiologically characterized in less than 20 minutes. [ABSTRACT FROM AUTHOR] more...
- Published
- 2023
- Full Text
- View/download PDF
48. Estimation of Radiation Dose in Building Materials Used In Federal University Gusau Using Gamma-Ray Spectroscopy Analysis.
- Author
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U., Yusuf, A. Y., Fagge, S. B., Jabaka, A. I., Baju, I. M., Shamsuddeen, and A. B., Isah
- Subjects
GAMMA rays ,CONSTRUCTION materials ,RADIOISOTOPES ,GRANITE ,RADIOLOGICAL health risk - Abstract
This study estimated the radiation dose in building materials (sand, cement, and granite) in Federal University Gusau, Zamfara State, Nigeria, through gamma-ray spectrometry system using a Sodium Iodide Thallium activated "NaITl" detector in a low background configuration. The range of the average activity concentration of
226 Ra was found to be 56.65±0.75Bqkg-1 to 159.45±2.68Bqkg-1 , which was higher than that of the world mean value for soil 35Bqkg-1 , for232 Th the range was 46.65±0.45Bqkg-1 to 79.32±1.68Bqkg-1 , all the samples, were found to be higher than that of the world mean for soil 30Bqkg-1 . While the activity concentrations of232 Th levels of blocks, granite, and sand samples are all above the world range, except the cement which was within the worldwide range 194.84±1.31Bqkg-1 to 656.84±0.76Bqkg-1 . The average activity concentration of40 K for cement, sand, and blocks was within the worldwide range, with granite samples slightly higher than the world mean value for soil 400Bqkg-1 . The results have been compared with the world mean values of 35, 30, and 400Bqkg-1 specified by the UNSCEAR (2016). Concerning radiological risk to human health, the absorbed gamma dose rate (D) was estimated to be above the world average range of 55nGyh-1 ; the outdoor annual effective dose equivalent (AEDE) were, estimated to be below the permissible limit of 0.07mSvy-1 . The values of Raeq, Hex, and Hin for all the samples in the present work are lower than the accepted safety limit value of 370Bqkg-1 and below the limit of unity, respectively. [ABSTRACT FROM AUTHOR] more...- Published
- 2023
- Full Text
- View/download PDF
49. Study on Gamma-Ray Spectra Feature Recognition and Isotope Composition Analysis of Plutonium Based on Convolutional Neural Networks
- Author
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Zhao, Haocheng, Bai, Lei, He, Lixia, and Liu, Chengmin, editor
- Published
- 2023
- Full Text
- View/download PDF
50. Investigation of Archean gamma-ray fingerprint: Methodology and tectonic application in central Brazil
- Author
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Marcus Flavio Nogueira Chiarini, Loiane Gomes de Moraes, Elton Luiz Dantas, Reinhardt Adolfo Fuck, Elias Prado, Raphael Teixeira Corrêa, Jaime Scandolara, Antônio Frasca, Joseneusa Rodrigues, and Andre Menezes Saboia more...
- Subjects
Archean ,gamma-ray spectrometry ,Transbrasiliano Lineament ,Goias ,U-Pb ,Uranium ,Geology ,QE1-996.5 - Abstract
Gamma-ray spectrometric responses of Archean rocks were studied in order to define a characteristic signature for these rocks. As the half-life of the most frequent Thorium isotope (232Th – half life of 14.05 Ga) is more than 3 times longer relative to the Uranium isotope (238U – half life of 4.50 Ga), a low response of radiation intensity in the spectral range of decay series of Uranium relative to that of Thorium is expected for Archean rocks. Based on this theoretical aspect, associated with gamma-ray spectrometric responses parametrically studied in several Archean areas of Brazil, gamma-ray and magnetometric structural interpretation, follow-up field studies, micropetrography, lithogeochemistry, and geochronology (U-Pb in zircon), it was possible to define and identify previously unidentified Archean rocks (2.82 Ga) tectonically imbricated amid Neoproterozoic magmatic arc terrains. This discovery has geotectonic implications regarding the magnitude of the Transbrasiliano Lineamento and its potential to fragment large Archean blocks and arrange them aligned within the Tocantins Province, Central Brazil. more...
- Published
- 2024
- Full Text
- View/download PDF
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