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Solvent Extraction and Spectrophotometric Determination of Uranium(VI) with 2,8,14,20-Tetramethyl-11,23-dinitrocavitand-5,17-dihydroxamic Acid 2,8,14,20-四甲基-11,23-二硝基-5,17-二羟肟酸溶剂萃取光度法测定铀(ⅵ
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060116
C. R. Sharma, R. N. Patadia, Y. K. Agrawal
{"title":"Solvent Extraction and Spectrophotometric Determination of Uranium(VI) with 2,8,14,20-Tetramethyl-11,23-dinitrocavitand-5,17-dihydroxamic Acid","authors":"C. R. Sharma,&nbsp;R. N. Patadia,&nbsp;Y. K. Agrawal","doi":"10.1134/S1066362225060116","DOIUrl":"10.1134/S1066362225060116","url":null,"abstract":"<p>Uranium is extracted, separated, and recovered using 2,8,14,20-tetramethyl-11,23-dinitrocavitand-5,17-dihydroxamic acid (NMCDH) in the presence of diverse ions. Uranium forms a yellow complex with NMCDH in <i>n</i>-octanol with the maximum absorbance at 450 nm and molar absorptivity of 5.0 × 10<sup>4</sup> L mol<sup>–1</sup> cm<sup>–1</sup>. It follows Beer’s law in the concentration range of 0.48–5.76 µg mL<sup>–1</sup>. The extracted complex is directly analyzed using ICP-MS with considerably higher sensitivity (detection limit 0.5 ng mL<sup>–1</sup>). The extraction constants of the uranium(VI)–NMCDH complex are determined. This method enables recovery of 99.95% pure uranium from monazite sand and phosphate rock; it is also effective for preconcentrating and detecting uranium in environmental samples.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"914 - 921"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337815","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Industrial Implementation of Combined Electrochemical and Ultrasonic Decontamination Technology 电化学与超声波联合去污技术的工业应用
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060207
A. A. Akatov, A. N. Grot, M. A. Krupina, I. A. Merkur’eva, O. A. Sakhnenko, N. A. Kuznetsova, P. V. Kozlov
{"title":"Industrial Implementation of Combined Electrochemical and Ultrasonic Decontamination Technology","authors":"A. A. Akatov,&nbsp;A. N. Grot,&nbsp;M. A. Krupina,&nbsp;I. A. Merkur’eva,&nbsp;O. A. Sakhnenko,&nbsp;N. A. Kuznetsova,&nbsp;P. V. Kozlov","doi":"10.1134/S1066362225060207","DOIUrl":"10.1134/S1066362225060207","url":null,"abstract":"<p>Prerequisites for the development and examples of pilot-scale and industrial installations for combined electrochemical and ultrasonic decontamination of metal surfaces (fuel rods, other items, fragmented metal waste), implementing the process developed by Alexandra Plus LLC and St. Petersburg State Institute of Technology, are considered. The installations, their main parameters, and operation results are described. The combined decontamination is advantageous in the efficiency and treatment rate over conventional immersion in decontaminating solutions or solely ultrasonic treatment.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"930 - 938"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337818","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment of Radiological Hazards of Natural Radionuclides 226Ra, 232Th, and 40K for Valley Sediments, Wadi Al-Maia, Eastern Desert, Egypt 埃及东部沙漠Wadi Al-Maia山谷沉积物中天然放射性核素226Ra、232Th和40K的辐射危害评价
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060244
A. El-Taher, G. Salaheldin, L. Abd Elslam
{"title":"Assessment of Radiological Hazards of Natural Radionuclides 226Ra, 232Th, and 40K for Valley Sediments, Wadi Al-Maia, Eastern Desert, Egypt","authors":"A. El-Taher,&nbsp;G. Salaheldin,&nbsp;L. Abd Elslam","doi":"10.1134/S1066362225060244","DOIUrl":"10.1134/S1066362225060244","url":null,"abstract":"<p>This study investigates the natural radioactivity of <sup>40</sup>K, <sup>226</sup>Ra, and <sup>232</sup>Th in valley sediments from Wadi Al-Maia located in Egypt’s Eastern Desert. Radiation monitoring was conducted using high-resolution gamma-ray spectrometry with a NaI(Tl) detector. The activity concentrations of ²²⁶Ra, ²³²Th, and ⁴⁰K were measured. Based on these measurements, several radiological hazard parameters were calculated, including the absorbed dose rate (ADR), radium equivalent activity (Ra<sub>eq</sub>), gamma index (<i>I</i><sub>γ</sub>), annual gonadal dose equivalent (AGDE), annual effective dose equivalent (AEDE<sub>out</sub> and AEDE<sub>in</sub>), and the external and internal hazard indices (<i>H</i>ₑₓ and <i>H</i>ᵢ<sub>n</sub>).The average values of these parameters were 347 nGy/h (ADR), 724 Bq/kg (Ra<sub>eq</sub>), 2.73 (<i>I</i><sub>γ</sub>), 2471 μSv/year (AGDE), 425 μSv/year (AEDE<sub>out</sub>), 1700 μSv/year (AEDE<sub>in</sub>), 1.96 (<i>H</i><sub>ex</sub>), and 2.47 (<i>H</i><sub>in</sub>), all of which exceed the worldwide recommended limits. These results indicate that the study area exhibits elevated natural radioactivity levels and potential radiological health risks. The findings can serve as a baseline for future monitoring of natural radionuclide contamination and radiological risk assessment in the Eastern Desert of Egypt.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"962 - 969"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337824","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Dependence of Natural Radioactivity on the Mineralogy of Rocks and the Assessment of Radiological Hazards in Dharwad Region of Karnataka, India 印度卡纳塔克邦达尔瓦德地区天然放射性对岩石矿物学的依赖性及放射性危害评价
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S106636222506027X
M. Bankapur, G. K. Kavya, M. M. Prakash, Y. Narayana
{"title":"Dependence of Natural Radioactivity on the Mineralogy of Rocks and the Assessment of Radiological Hazards in Dharwad Region of Karnataka, India","authors":"M. Bankapur,&nbsp;G. K. Kavya,&nbsp;M. M. Prakash,&nbsp;Y. Narayana","doi":"10.1134/S106636222506027X","DOIUrl":"10.1134/S106636222506027X","url":null,"abstract":"<p>The natural radioactivity in rock and dependence of the radioactivity on the mineralogy of rocks in the Dharwad region of Karnataka, India, were studied. The radionuclide activity in rocks was analyzed using a NaI(Tl) gamma-ray spectrometer, and the mineralogy was studied using FTIR spectroscopy and X-ray diffraction. The activity concentrations varied from 105 ± 2 to 783 ± 7 Bq kg<sup>–1</sup> for <sup>40</sup>K, from 2 ± 0.5 to 63 ± 2 Bq kg<sup>–1</sup> for <sup>226</sup>Ra, and from 10 ± 1 to 65 ± 2 Bq kg<sup>–1</sup> for <sup>232</sup>Th, with mean activity of 511 ± 6, 31 ± 2, and 39 ± 1 Bq kg<sup>–1</sup>, respectively. The activities of natural radionuclides were found to be slightly higher for <sup>40</sup>K and <sup>232</sup>Th but lower for <sup>226</sup>Ra. The radiation hazard indices were determined to assess the radiation exposure of the region’s population. The study showed that elevated <sup>40</sup>K and <sup>232</sup>Th levels in the region are due to the presence of potassium-rich biotite, silicate-bearing feldspar, and phosphate mineral monazite present in the rocks of the region.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"989 - 1002"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337825","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Development of a Flowsheet for Separating Boron Isotopes Using Liquid Extraction 液体萃取分离硼同位素流程的研制
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060153
L. I. Tkachenko, A. S. Vissarionova, E. V. Kenf, Yu. A. Naumova, Ya. O. Pleshakov, S. A. Krotov, E. A. Puzikov, A. V. Dub
{"title":"Development of a Flowsheet for Separating Boron Isotopes Using Liquid Extraction","authors":"L. I. Tkachenko,&nbsp;A. S. Vissarionova,&nbsp;E. V. Kenf,&nbsp;Yu. A. Naumova,&nbsp;Ya. O. Pleshakov,&nbsp;S. A. Krotov,&nbsp;E. A. Puzikov,&nbsp;A. V. Dub","doi":"10.1134/S1066362225060153","DOIUrl":"10.1134/S1066362225060153","url":null,"abstract":"<p>The extraction system consisting of <i>n</i>-trioctylamine in <i>o</i>-xylene and an aqueous solution of boric and tartaric acids was chosen for separating boron isotopes by chemical exchange in a liquid–liquid system. The choice was based on the experimental data of the Khlopin Radium Institute and published data. An average separation factor of 1.02 was achieved. It was independent of the <sup>10</sup>B content in the initial solution, which ranged from 20 to 96.6%. A principle for organizing a flowsheet of boric acid enrichment in <sup>10</sup>B using liquid–liquid extraction with the return of a portion of the enriched product (reflux) was suggested.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"892 - 898"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337343","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Determination of the Iodine-129 Activity in High-Level Waste 高放废物中碘-129活度的测定
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060177
E. V. Chukhlantseva, O. V. Stepanova, O. Yu. Dichenko, O. A. Kutuzova
{"title":"Determination of the Iodine-129 Activity in High-Level Waste","authors":"E. V. Chukhlantseva,&nbsp;O. V. Stepanova,&nbsp;O. Yu. Dichenko,&nbsp;O. A. Kutuzova","doi":"10.1134/S1066362225060177","DOIUrl":"10.1134/S1066362225060177","url":null,"abstract":"<p>Instrumental analysis of the <sup>129</sup>I amount in various kinds of high-level waste was performed. The measured specific activities of <sup>129</sup>I in the high-level waste samples are lower than the calculated values by 1–2 orders of magnitude.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"909 - 913"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337344","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Cesium Recovery from the Spent Nuclear Fuel of BOR-60 Research Nuclear Reactor 从BOR-60研究堆乏燃料中回收铯
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S106636222506013X
V. A. Boldakov, A. S. Kornilov, O. S. Dmitrieva, N. O. Pozigun, A. A. Tel’nova, S. S. Poglyad
{"title":"Cesium Recovery from the Spent Nuclear Fuel of BOR-60 Research Nuclear Reactor","authors":"V. A. Boldakov,&nbsp;A. S. Kornilov,&nbsp;O. S. Dmitrieva,&nbsp;N. O. Pozigun,&nbsp;A. A. Tel’nova,&nbsp;S. S. Poglyad","doi":"10.1134/S106636222506013X","DOIUrl":"10.1134/S106636222506013X","url":null,"abstract":"<p>Based on the results of studying the reprocessing of spent nuclear fuel (SNF) from BOR-60 fast research reactor, a flowsheet was suggested for the fuel pretreatment prior to extractive partitioning of the elements. The flowsheet involves joint fusion of SNF with molybdenum trioxide, washing of the fusion cake with an alkali solution to remove the alkali metal fraction, and subsequent dissolution of fissile materials and fission products in nitric acid. An experiment with SNF from the fast reactor demonstrated the possibility of separating up to 99.0 ± 0.1% of cesium radionuclides from the fuel prior to extractive reprocessing in accordance with the suggested flowsheet. In so doing, about 90% of molybdenum can be recovered from the alkali fraction and returned to the production cycle.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"877 - 880"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337725","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Specific Features of the Extraction-Chromatographic Separation of Lutetium and Ytterbium Using the Sorbent Based on 2-Ethylhexyl Hydrogen 2-Ethylhexylphosphonate 2-乙基己基氢- 2-乙基己基膦酸盐吸附剂萃取-色谱分离镥和镱的特性
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060098
K. S. Bobrovskaya, R. A. Kuznetsov, M. N. Lisova
{"title":"Specific Features of the Extraction-Chromatographic Separation of Lutetium and Ytterbium Using the Sorbent Based on 2-Ethylhexyl Hydrogen 2-Ethylhexylphosphonate","authors":"K. S. Bobrovskaya,&nbsp;R. A. Kuznetsov,&nbsp;M. N. Lisova","doi":"10.1134/S1066362225060098","DOIUrl":"10.1134/S1066362225060098","url":null,"abstract":"<p>Specific features of the preparative extraction-chromatographic separation of small amounts of lutetium and prevalent amounts of ytterbium using a sorbent based on Prefilter resin, impregnated with 2-ethylhexyl hydrogen 2-ethylhexylphosphonate, are considered. In the presence of prevalent ytterbium amounts, the distribution ratios of both ytterbium and lutetium decrease owing to the formation of complexes Ln(HA<sub>2</sub>)<sub>3</sub> or LnA(HA<sub>2</sub>)<sub>2</sub>, which decreases the concentration of the free extractant in the sorbent and is the major factor responsible for the significant deviation of the elution curve shape from the classical Gaussian shape. Analysis of the Lu and Yb distribution along the column and the Fourier IR spectra of the sorbent samples show that the formation of the third phase in the sorbent at the acidity lower than 0.1 M is improbable, and this process does not affect the behavior of Yb and Lu.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"846 - 855"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337814","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Assessment and Monte Carlo Risk Simulation of Radon-222 in River Sediments: A Case Study from the Lower Zab, Kurdistan Region, Iraq 河流沉积物中氡-222的评价与蒙特卡罗风险模拟——以伊拉克库尔德斯坦地区下扎布为例
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060268
D. S. Saleh, H. Salh, J. M. Smail, H. H. Azeez, S. T. Ahmad
{"title":"Assessment and Monte Carlo Risk Simulation of Radon-222 in River Sediments: A Case Study from the Lower Zab, Kurdistan Region, Iraq","authors":"D. S. Saleh,&nbsp;H. Salh,&nbsp;J. M. Smail,&nbsp;H. H. Azeez,&nbsp;S. T. Ahmad","doi":"10.1134/S1066362225060268","DOIUrl":"10.1134/S1066362225060268","url":null,"abstract":"<p>This study assesses the concentration and radiological impact of ²²²Rn in river sediments collected from 18 locations along the Lower Zab River in the Kurdistan Region of Iraq. The ²²²Rn activity concentrations in sediments were measured with a RAD7 radon detector. They range from 25 ± 1.6 to 267 ± 16 Bq m<sup>–3</sup> with a mean of 62 ± 9 Bq m<sup>–3</sup>. The highest level, observed at the Jaly site, exceeded the International Commission on Radiological Protection (ICRP) safety threshold of 200 Bq m<sup>–3</sup>. Monte Carlo simulation (10000 iterations) was used to model the exposure variability, yielding a regional average AED of 1.31 mSv year<sup>–1</sup> (95% CI: 0.86–1.76). Occupancy analysis showed that the annual effective dose (AED) remains below 1 mSv year<sup>–1</sup> only if the indoor occupancy is below ~63% for most locations and below ~12% for the high-risk site. Radon exhalation rates reached up to 14.8 ± 0.9 Bq m<sup>–2</sup> day<sup>–1</sup>, and radium concentrations, up to 2.46 ± 0.15 Bq kg<sup>–1</sup>. The sediment-to-surface-water radon concentration ratios ranged from 7.6 to 533, confirming sediments as a significant source of environmental radon. A strong correlation between ²²⁶Ra and radon exhalation further supports this origin.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"979 - 988"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337820","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
A Fully Relativistic Study of the Geometry and Atomization Energy of Radium Dihalides by Coupled Cluster and Density Functional Theory Methods 用耦合簇和密度泛函理论方法研究二卤化镭的几何和原子化能
IF 1
Radiochemistry Pub Date : 2026-02-08 DOI: 10.1134/S1066362225060050
T. A. Isaev
{"title":"A Fully Relativistic Study of the Geometry and Atomization Energy of Radium Dihalides by Coupled Cluster and Density Functional Theory Methods","authors":"T. A. Isaev","doi":"10.1134/S1066362225060050","DOIUrl":"10.1134/S1066362225060050","url":null,"abstract":"<p>The equilibrium geometries of radium dihalides RaX<sub>2</sub> (X = F, Cl, Br) in their ground electronic state were found by the coupled cluster method with single and double cluster amplitudes and perturbative triples in the 4c framework. These data were compared to the geometries obtained by the density functional theory (DFT). Within the DFT framework, the atomization energy (AE) of radium dihalides was also calculated. Noticeable difference in AE values calculated with PBE0 and B3LYP exchange-correlation functionals was observed. The trend toward a decrease in the geometrical nonlinearity for heavy metal dihalides in the series F → Cl → Br is confirmed. In comparison to their homologs BaX<sub>2</sub>, compounds RaX<sub>2</sub> have systematically lower AEs.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"67 6","pages":"825 - 829"},"PeriodicalIF":1.0,"publicationDate":"2026-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147337822","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
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