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© 2018 Elsevier Ltd This paper explores the possibility of a direct measurement of 14C activity concentration in wastewater without chemical pretreatment of samples, which would provide the advantages such as rapidity, low-cost, and simplicity of radioanalysis that is desirable in the case of nuclear emergencies. A method via Liquid Scintillation Counting (LSC) technique has been implemented and optimized. The method assumes mixing of the water sample with a scintillation cocktail (Permafluor E+ and Ultima Gold AB cocktails were tested). Measurements were performed on Ultra Low Level Liquid Scintillation Spectrometer Wallac 1220 Quantulus. Optimization of the method included optimal water:cocktail volume ratio, optimal counting window selection, PAC (Pulse Amplitude Comparator) parameter adjustment, based on the highest FOM (Figure of Merit) value achieved, as well as detection efficiency and detection limit evaluation. The main problem in such an approach, interference with other beta emitters that are often present in wastewater samples, has been discussed. The possibility to eliminate low-energy counts that would be generated from 3H, and to estimate the contribution of other high-energy beta emitters to obtained results of 14C content is presented as well. Method's constraints, its accuracy, and precision have been considered from the obtained results of measurements of wastewater samples. Its application is limited only to 14C screening of samples with much higher 14C activities than those of the environmental (surface and ground) waters. Presented results could be used as guiding principles of development, optimization, and implementation of the fast 14C screening method in other laboratories.

Although chloride compounds are the main cause of corrosion damage in distillation unit, standard methods to determine them do not guarantee good results. In this study, the chloride concentration of different crude oils was measured using different techniques and the results were compared. ASTM D3230, D4929 as standard methods, XRF as alternative technique and Neutron Activation Analysis as reference method, were applied. It is concluded that XRF method is an effective technique for measuring the chloride concentration of oils.

Given that more than half of the radiation affecting humans is provided by radon and its progenies, surveying them has received a significant level of attention. Solid-state nuclear track detectors are most suited to carry out such surveys, e.g., CR-39-based detectors. Ordinarily, track detectors employ optical microscopes; however, in this study, a new scanner-based calibration and validation system is introduced. After exposure, the detectors were etched in a 6.25 M NaOH solution at 90 °C for 4.5 h; the diameters of the tracks developed in this way were typically 40–60 microns. Tracks were assessed using a Canon Canoscan 9000F scanner with a resolution of 4800 dpi, and Image Analyser software developed by ourselves. For the system calibration, known diameter tracks were prepared using an ArF excimer laser (λ = 193 nm), such that both the shape coefficient and the size of the tracks could be changed within the range of 10–100 μm. The operation of the scanner and the evaluation-shape recognition software were examined using repeatability and reproducibility tests. The system was capable of evaluating 100 detectors in an hour. The repeatability and reproducibility value of the system was excellent, with evaluation of the same detector on several occasions at different times producing a spread of 2%. The maximum spread for scanning in different positions was 3%.

The thin gap method as an in-situ radiotracer technique is widely used. This study investigated the applicability of alpha emitters. PIPS and CsI alpha spectrometers were applied in a thin gap cell. A suitable (210)Po source was prepared by spontaneous deposition, Mylar foil was used to simulate water. A maximum intensity decrement of 7% within 25 μm was observed. Even though this method is suitable for the study of surface phenomena, further investigation is necessary e.g. into water and heat sensitivity.