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Optimization and application of ferrous reduced ammonium vanadate titration method for the determination of uranium content in geological samples
In this study, based on titration method for the determination of uranium content of the nuclear industry standard test, the pretreatment process such as sample dissolution, sample dissolution reagent and test method has been improved according to the characteristics of geological samples. The results showed that the sample was moistened with water before acid treatment, and the dissolving vessel was adjusted from 100  mL beaker to 150 mL triangle flask, which basically avoided the problem of sputtering during the boiling process. The amount of phosphoric acid added in the sample dissolution reagent was increased to ensu...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Development of a non-destructive carbon quantification method in iron by negative muon lifetime measurement
AbstractA novel nondestructive light element analysis method for bulk materials using muon beams was demonstrated. This method is based on the lifetime measurement of muons in a material and performed by measuring muon-decay electrons and identifying elements using the atomic number based on muon lifetimes. Muon irradiation on pure iron and two steel samples with known carbon contents was conducted to prepare a calibration curve for the quantitative analysis. We also performed a muon lifetime measurement for a Japanese sword and successfully determined its carbon content as 0.51  wt% using the calibration curve, without s...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Application of deep metric learning model to microscope image analysis for the determination of UOC samples in nuclear forensics analysis
This study discusses the application of a deep metric learning model based on a convolutional neural network to scanning electron microscope image analysis to determine UOC samples. One of the unique features of this technique is that it can detect a sample that comes from an unknown material not listed in the reference for comparison, in addition to the classification of a sample based on surface characteristics captured in the microscopic images. It was confirmed that the present technique could detect hypothetical unknown samples with  >  0.8 of Area Under the ROC Curve, and it can effectively provide preliminary...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Liquid –liquid extraction of strontium from acidic solutions into ionic liquids using crown ethers
Abstract90Sr is one of the most monitored fission products. New efficient methods for strontium separation are therefore sought. Over the past 20  years, crown ethers solutions in ionic liquids (ILs) have been confirmed to efficiently extract strontium from acidic solutions. Despite all the work done in this field, the extraction mechanism is still not completely clear. Depending on experimental conditions, the extraction is believed to proc eed either in the form of an ion-association complex [Sr·CE·(NO3)2] or via exchange between [Sr ·CE]2+ and two IL cations. This work aims to study the influence of several extracti...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Nuclear forensics case in Croatia: elevated U and Ra radioactive material found at Karasovi ći border
AbstractA case of illegal possession of suspect material at the Karasovi ći border crossing in Croatia was recently recorded and resolved. An increased activity of226Ra was detected in the suspect material. The seized material consisted of 2 types of samples, black powder and jewellery. The material was analysed by the high-resolution gamma spectrometry method in the Laboratory for Radioecology of the Ru đer Bošković Institute. The seized material was confirmed to contain uranium. The material was additionally analysed by the X-ray diffraction method. Identified mineral phases have not been found in Croatia so far, the...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

A comprehensive investigation of an approach for 144Ce-separation as a by-product of the fission molybdenum-99 process
AbstractCerium-144 (144Ce), as a long-lived β emitter radioisotope (Eβavg = 82.25 keV, T1/2 = 284.9 d), is a potentially promising radionuclide to be used in various medical and industrial applications. In this paper, an optimized process for the separation of144Ce from fission products is reported. Following the MCNPX calculation results, an equivalent solution was experimentally prepared that is similar to the waste solution of local99Mo production via the fission method. For analyzing the steps of the radiochemical process, the suitable radioisotope tracers created from the activation method and were added to ...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Distribution, health effects and source apportionment of uranium and other potentially toxic elements in Ganga water
AbstractAnalysis of U, Cr, Ni, As, Mo, Cd and Pb was performed in Ganga water in Uttarakhand state of India using Inductively Coupled Plasma Mass Spectrometry (ICPMS). Seasonal and spatial variability in the analyzed Potentially Toxic Elements (PTEs) concentrations were observed in Ganga water in this study. The health risks of PTEs in Ganga water were estimated as pollution indices, hazard quotients and cancer risk. The estimated risk assessment parameters show that Ganga water is not contaminated by the analyzed PTEs in the investigated region. A multivariate statistical analysis of the obtained dataset was performed to ...
Source: Journal of Radioanalytical and Nuclear Chemistry - January 4, 2024 Category: Nuclear Medicine Source Type: research

Correction to: Effective determination of trace rare earth elements in ThF4 by ICP-MS with different material pretreatment procedures
(Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - January 2, 2024 Category: Nuclear Medicine Source Type: research

50 Years of uranium isotopic reference materials at JRC-Geel
AbstractThe history of uranium isotopic reference materials from JRC-Geel during the last 50  years is reviewed by presenting certification methods and relevant applications. The certified isotope ratios are traceable to the SI via gravimetrical preparation, either directly through gravimetrical mixing of highly enriched materials, or indirectly using existing gravimetrically prepared refe rence materials for calibration of mass spectrometers used for certification measurements. Due to developments of mass spectrometers and analytical methods, certification measurements have improved regarding precision, uncertainties and...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 29, 2023 Category: Nuclear Medicine Source Type: research

Availability of neutron activation facilities to foreign users at research centre Řež, Czech Republic
AbstractSeveral neutron sources are available at Research Centre Řež (CVŘ) that are usable in neutron physics and radioanalytical measurements, namely two experimental nuclear reactors—a ‘zero’ power (maximum 5 kW) LR-0 reactor and a medium power (maximum 10 MW) LVR-15 reactor, a252Cf source and a D –T generator of fast neutrons. Their basic parameters and modes of applications in various fields of science and technology are described. The reactors and other neutron sources are equipped with a number of gamma-ray (mostly High Purity Germanium (HPGe)), and neutron spectrometers to allow for as say of studied ma...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 23, 2023 Category: Nuclear Medicine Source Type: research

Geochemical study of rare earth elements, uranium and thorium in mylonitic rocks of north Abu Rusheid, Egypt using inductively coupled plasma mass spectrometry
AbstractA geochemical study of rare earth elements (REEs), uranium (U), thorium (Th) and major elements was conducted in mylonitic rocks found in north Abu Rusheid, south eastern desert, Egypt, a well-known uranium ore deposit area. The concentrations of REEs, U, and Th were measured using inductively coupled plasma mass spectrometry. ∑REEs varied from 38 to 183 µg/g with a mean value of 90 µg/g. U and Th concentrations varied from 67 to 171 and 98 to 454 µg/g, respectively. The mean value of the U/Th ratio was higher than the upper continental crust value and the mylonitic rocks were concluded to have high U conte...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 22, 2023 Category: Nuclear Medicine Source Type: research

Optimizing material selection and the thickness of radon reduction layer in uranium tailings pond
AbstractIn this paper, a multi-objective decision model is formulated utilizing both single-layer and three-layer radon reduction layer materials by considering radon emanation rate and cost as decision objectives. Through a multi-objective non-dominated ranking method, the optimal solution is identified from a range of feasible alternatives. In the case of the example uranium tailings pond, the optimized three-layer radon reduction layer materials reduce the comprehensive cost by 47.8% compared with the single-layer radon reduction layer materials while meeting the radon emanation rate limit. Furthermore, the utilization ...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 19, 2023 Category: Nuclear Medicine Source Type: research

Adsorption of uranium(VI) in aqueous solution by tetraphenyldithiodiphosphonate
AbstractTetraphenyldithiodiphosphonate is synthesized by polymerization precipitation. The P  = S bond of the material has strong polarity, which is conducive to improving the electron mobility of the complex and inhibiting the accumulation between molecules. The synthesized tetraphenyldithiodiphosphonate is characterized by FT-IR, SEM, XPS and XRD. In addition, the pseudo-second-order kinetic model is used to simulate the experimental data well, and the adsorption process conforms to the Langmuir isotherm model. Thermodynamic studies of adsorption have shown that the adsorption process is essentially a spontaneous end...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 16, 2023 Category: Nuclear Medicine Source Type: research

Adsorption of U(VI) by chitosan crosslinked PAO aerogel
AbstractNovel chitosan crosslinked amidoxime polyacrylonitrile aerogel was synthesized and used for adsorption of uranium from seawater. The effects of initial uranium concentration, contact time, and pH value on uranium adsorption were investigated. The simulated uranium solution adsorption experiment shows that under the condition of an initial uranium concentration of 100  mg/L, the maximum adsorption capacity of CTS-g-PAO is 203.4 mg/g. The adsorption process can be well-fitted by Freundlich and Pseudo-second order models. In addition, CTS-g-PAO aerogel has good antibacterial activity against marine bacteria, with th...
Source: Journal of Radioanalytical and Nuclear Chemistry - December 15, 2023 Category: Nuclear Medicine Source Type: research

Solvent extraction following oxidation of astatine for the use of a 211Rn –211At generator
Abstract211At is a promising nuclide among various α-emitters for targetedα therapy. In order to expand its accessibility, we're creating a211Rn –211At generator. Using N-bromosuccinimide (NBS), we successfully back-extracted211At from dodecane into 90% aqueous ethanol. NBS oxidizes211At into easily extractable compounds with high oxidation numbers, as confirmed through thin-layer chromatography. (Source: Journal of Radioanalytical and Nuclear Chemistry)
Source: Journal of Radioanalytical and Nuclear Chemistry - December 14, 2023 Category: Nuclear Medicine Source Type: research