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Study of the Chemical Stability of Sr0.5Zr2(PO4)3 Phosphate with a Kosnarite Structure in Various Environments 具有科斯纳拉特结构的 Sr0.5Zr2(PO4)3 磷酸盐在各种环境中的化学稳定性研究
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060036
L. S. Alekseeva, A. V. Nokhrin, A. I. Orlova, M. S. Boldin, A. V. Voronin, A. A. Murashov, V. N. Chuvil’deev
{"title":"Study of the Chemical Stability of Sr0.5Zr2(PO4)3 Phosphate with a Kosnarite Structure in Various Environments","authors":"L. S. Alekseeva,&nbsp;A. V. Nokhrin,&nbsp;A. I. Orlova,&nbsp;M. S. Boldin,&nbsp;A. V. Voronin,&nbsp;A. A. Murashov,&nbsp;V. N. Chuvil’deev","doi":"10.1134/S1066362223060036","DOIUrl":"10.1134/S1066362223060036","url":null,"abstract":"<p>Samples of ceramics based on Sr<sub>0.5</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> phosphate with the structure of the kosnarite mineral (NaZr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub>, NZP) were obtained by spark plasma sintering. Submicron phosphate powders with particle sizes less than 1 μm were produced by the sol–gel method. Powders and ceramics have a single-phase NZP structure. The relative density of the ceramics was 97.6%. The chemical stability of the obtained ceramics was studied in static mode at 90°C in distilled and mineral water and in acidic and alkaline environments. The minimum achieved leaching rates were ~10<sup>–4</sup>–10<sup>–6</sup> g/(cm<sup>2</sup> day). The influence of the contact environment on the rate and mechanism of Sr leaching from Sr<sub>0.5</sub>Zr<sub>2</sub>(PO<sub>4</sub>)<sub>3</sub> ceramic samples within 42 days was investigated. It was shown that over testing in distilled water and in mineral water (up to 7 days) Sr leaching occurs due to the dissolution of the surface layer of ceramics and after 7 days of testing in mineral water, due to washing out of Sr from the open ceramic surface.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"634 - 641"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903201","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
Automated Synthesis Module for L-[11С-Methyl]methionine: Design, Performance, and Efficiency in PET L-[11С-Methyl]methionine 的自动合成模块：PET 中的设计、性能和效率
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060097
O. F. Kuznetsova, V. V. Orlovskaya, D. D. Vaulina, V. Yu. Obolentsev, A. S. Demyanov, R. N. Krasikova
{"title":"Automated Synthesis Module for L-[11С-Methyl]methionine: Design, Performance, and Efficiency in PET","authors":"O. F. Kuznetsova,&nbsp;V. V. Orlovskaya,&nbsp;D. D. Vaulina,&nbsp;V. Yu. Obolentsev,&nbsp;A. S. Demyanov,&nbsp;R. N. Krasikova","doi":"10.1134/S1066362223060097","DOIUrl":"10.1134/S1066362223060097","url":null,"abstract":"<p> An automated module for the synthesis of L-[<sup>11</sup>C-methyl]methionine, a well-known PET radiotracer for brain tumor imaging, has been designed. The module meets modern requirements for the production of radiopharmaceuticals and radiation safety; thanks to the original program created in the Delphi programming environment, module is convenient for the synthesis control (user-friendly) and operation; the service can be maintained on its own with minimal time and financial costs. The module ensures the production of L-[<sup>11</sup>C-methyl]methionine with high chemical, radiochemical and enantiomeric purity and a radiochemical yield of 30% (based on [<sup>11</sup>C]CO<sub>2</sub> activity, not decay corrected).</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"680 - 689"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903199","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
Effect of Temperature and Absorbed Dose on the Rate of Formation and Composition of Gaseous Products of Radiolysis of Bitumen-Bearing Rock 温度和吸收剂量对含沥青岩石放射性分解气态产物的形成速率和成分的影响
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060115
L. Jabbarova, I. Mustafayev, N. Gasanalieva
{"title":"Effect of Temperature and Absorbed Dose on the Rate of Formation and Composition of Gaseous Products of Radiolysis of Bitumen-Bearing Rock","authors":"L. Jabbarova,&nbsp;I. Mustafayev,&nbsp;N. Gasanalieva","doi":"10.1134/S1066362223060115","DOIUrl":"10.1134/S1066362223060115","url":null,"abstract":"<p>The results of study of gas formation at the radiation-thermal transformation of bituminous rocks of Kirmaku fields of Azerbaijan are adduced. The studies were carried out under the influence of γ-radiation and accelerated electrons in a wide range of temperatures (20–500°C), absorbed dose (0–260 kGy), and dose rate (1 and 470 Gy/s). The influence of temperature and adsorbed dose on the gas formation rate and content of products has been established. Estimates of technical and economic indicators of the process are given. The results of these studies allow the estimation of the potential of the radiation-thermal method for producing oil products for various purposes.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"699 - 707"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903203","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
Erratum to: Effect of Strontium and Calcium Impurities on Productivity of 82Sr/82Rb Medical Generator 勘误：锶和钙杂质对 82Sr/82Rb 医用发生器生产率的影响
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362222060139
V. M. Chudakov, S. V. Shatik, B. L. Zhuikov
{"title":"Erratum to: Effect of Strontium and Calcium Impurities on Productivity of 82Sr/82Rb Medical Generator","authors":"V. M. Chudakov,&nbsp;S. V. Shatik,&nbsp;B. L. Zhuikov","doi":"10.1134/S1066362222060139","DOIUrl":"10.1134/S1066362222060139","url":null,"abstract":"","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"715 - 715"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903189","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
Extraction Properties of Polyphosphorylated Pyridines in Nitric Acid Media 多磷酸化吡啶在硝酸介质中的萃取特性
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060048
A. N. Turanov, V. K. Karandashev, G. V. Kostikova, A. M. Fedoseev, O. I. Artyushin, V. K. Brel
{"title":"Extraction Properties of Polyphosphorylated Pyridines in Nitric Acid Media","authors":"A. N. Turanov,&nbsp;V. K. Karandashev,&nbsp;G. V. Kostikova,&nbsp;A. M. Fedoseev,&nbsp;O. I. Artyushin,&nbsp;V. K. Brel","doi":"10.1134/S1066362223060048","DOIUrl":"10.1134/S1066362223060048","url":null,"abstract":"<p>The extraction of U(VI), Th(IV), Am(III), and Eu(III) with solutions of phosphorylated pyridines from nitric acid solutions has been studied. The stoichiometry of the extractable complexes was established. In terms of their extraction ability, these compounds are inferior to bis(diphenylphosphinyl)methane, but they are significantly superior to carbamoylmethylphosphine oxides. An increase in the number of phosphine oxide groups in the molecules of phosphorylated pyridines leads to a significant decrease in their extraction ability and selectivity in the extraction of Am(III) and Eu(III) from nitric acid solutions.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"642 - 647"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903204","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
Comparative Analysis of Experimental Data on the Sublimation of Uranium Carbonitrides and Uranium–Zirconium Carbonitrides at High Temperatures 碳氮化铀和碳氮化铀锆在高温下升华的实验数据对比分析
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060012
G. S. Bulatov, K. E. German
{"title":"Comparative Analysis of Experimental Data on the Sublimation of Uranium Carbonitrides and Uranium–Zirconium Carbonitrides at High Temperatures","authors":"G. S. Bulatov,&nbsp;K. E. German","doi":"10.1134/S1066362223060012","DOIUrl":"10.1134/S1066362223060012","url":null,"abstract":"<p>The review is devoted to a comparison of new experimental data on the sublimation of uranium–zirconium carbonitrides with different contents of carbon, nitrogen, and oxygen impurities at high temperatures (1700–2300 K), we obtained in the past 2 years, with data of previous reported works on the sublimation of uranium carbonitrides, we and other authors prepared using mass spectrometry and some other methods of thermodynamic analysis. The main attention is paid to the consideration of the composition of the gas phase and the analytical dependences of the partial pressures of its components on temperature, as well as the chemical mechanism and heats of sublimation. The essential feature of the sublimation process of all materials based on uranium carbonitride (both pure and doped with zirconium) is its incongruent nature, due to the loss of nitrogen, which leads to a shift in their compositions towards the phase with higher carbon content. The chemical mechanisms of sublimation of carbonitrides of both types are considered, according to which oxygen impurities in these materials bring about the appearance of oxide components UO, UO<sub>2</sub>, and CO in the gas phase and additional release of nitrogen. The introduction of zirconium into uranium carbonitride and an increase in the carbon content in it lead to a decrease in the partial pressures of uranium monoxide and nitrogen, which increases the thermal stability of this innovative fuel material.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"619 - 627"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903205","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
Physicochemical Mechanisms of Dissolved 137Cs Seasonal Variations in Freshwaters: Fukushima and Chernobyl 淡水中溶解的 137Cs 季节性变化的物理化学机制：福岛和切尔诺贝利
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060127
A. V. Konoplev
{"title":"Physicochemical Mechanisms of Dissolved 137Cs Seasonal Variations in Freshwaters: Fukushima and Chernobyl","authors":"A. V. Konoplev","doi":"10.1134/S1066362223060127","DOIUrl":"10.1134/S1066362223060127","url":null,"abstract":"<p>Analysis of available monitoring data sets on concentrations of accidentally derived dissolved radiocesium in water bodies is indicative of two major physicochemical mechanisms responsible for their seasonal variations in water bodies in the course of the year: temperature dependence of radiocesium desorption from suspended material and ion-exchange remobilization of radiocesium by ammonium cations formed during decomposition of organic matter in anoxic conditions. An equation describing seasonal variations in concentration of dissolved radiocesium in water bodies has been derived accounting for two factors: water temperature, and combined concentration of key competing cations.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"708 - 714"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903059","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
Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxide UN 和 UO2 在空气和二氧化氮中的氧化对比分析
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060024
M. I. Volgin, S. A. Kulyukhin, Yu. M. Nevolin
{"title":"Comparative Analysis of UN and UO2 Oxidation in Air and Nitrogen Hemioxide","authors":"M. I. Volgin,&nbsp;S. A. Kulyukhin,&nbsp;Yu. M. Nevolin","doi":"10.1134/S1066362223060024","DOIUrl":"10.1134/S1066362223060024","url":null,"abstract":"<p>Oxidation of UO<sub>2</sub> and UN by atmospheric oxygen and nitrogen hemioxide, which is a hard-to-localize greenhouse gas, was investigated by thermal analysis. For oxidation, mixtures of N<sub>2</sub>O–N<sub>2</sub> and O<sub>2</sub>–N<sub>2</sub> were used with a 20% volume fraction of the oxidizing agent. For UO<sub>2</sub> and UN, the phase composition of the final oxidation product in air and in N<sub>2</sub>O is the same―U<sub>3</sub>O<sub>8</sub>. In both cases, N<sub>2</sub>O behaves as a milder oxidizing agent compared to atmospheric oxygen. Oxidation of UO<sub>2</sub> and UN in an N<sub>2</sub>O flow starts at a temperature 180 and 70°C higher than in air, respectively. The oxidation of UN in an N<sub>2</sub>O flow proceeds in three stages. At the first stage, the reaction products are UO<sub>2</sub> and U<sub>2</sub>N<sub>3</sub>; UO<sub>2</sub> is the product of the second stage; and at the third stage U<sub>3</sub>O<sub>8</sub> is produced. No pronounced staging is observed in the UO<sub>2</sub> oxidation process. The possibility of utilizing nitrogen hemioxide when it is used in the course of voloxidation (oxidation) of spent nuclear fuel is shown.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"628 - 633"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903060","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
Sorption of Sr(II) Ions with Tricalcium Phosphate in the Presence of Humic Acids 腐殖酸存在时硒(II)离子与磷酸三钙的吸附作用
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060073
A. A. Ioshin, I. V. Volkov, E. V. Polyakov
{"title":"Sorption of Sr(II) Ions with Tricalcium Phosphate in the Presence of Humic Acids","authors":"A. A. Ioshin,&nbsp;I. V. Volkov,&nbsp;E. V. Polyakov","doi":"10.1134/S1066362223060073","DOIUrl":"10.1134/S1066362223060073","url":null,"abstract":"<p>The sorption behavior of traces Sr(II) toward β-Ca<sub>3</sub>(PO<sub>4</sub>)<sub>2</sub> (TCP) depending on the concentration of the cation, pH, and concentrations of humic acids (HA) in the solution was studied. Thermodynamic analysis of the solubility of TCP (<b>1</b>) was performed taking into account the formation of Ca(OH)<sub>2</sub> (CH, <b>2</b>), Ca(H<sub>2</sub>PO<sub>4</sub>)<sub>2</sub> (MCPA, <b>3</b>), CaHPO<sub>4</sub>·2H<sub>2</sub>O (DCPD, <b>4</b>), Ca<sub>5</sub>(PO<sub>4</sub>)<sub>3</sub>OH (hydroxyapatite, OHAp, <b>5</b>), and Ca<sub>2</sub>P<sub>2</sub>O<sub>7</sub> (DCPP, <b>6</b>). It was shown that, depending on the pH of the solution, the main equilibrium phases with the solution are phases <b>4</b> and <b>5</b>. X-ray diffraction analysis, Raman spectroscopy, and <sup>31</sup>P NMR data of the phase (<b>1</b>) samples after contact with a solution of 0.01 M NaNO<sub>3</sub> for about 10 days showed the presence of only the phase <b>1</b>. The solubility of <b>1</b> regarding the concentration of Ca<sup>2+</sup>, PO<sub>4</sub><sup>3–</sup> ions and the stoichiometric ratio (Ca/P) in solutions, depending on pH, correspond to the presence of surface phases <b>4</b> or <b>5</b>. The model of surface complexation in the Henry region adequately describes the mechanism of Sr(II) sorption by the surface phase <b>5</b> on TCP particles in the form of the SrHPO<sub>4</sub><sup>0</sup> complex. The formation of the HA complex of Sr(II) in solution does not affect distribution coefficient <i>K</i><sub>d</sub>(Sr) in the range of HA concentrations of 0–150 mg/L due to the competitive effect of hydrogen phosphate ions on strontium complexes.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"661 - 671"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903200","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
Influence of Irradiation on the Stability of Extraction Mixtures Based on Methyltri-n-Octylammonium Carbonate 辐照对基于碳酸甲基三辛铵的萃取混合物稳定性的影响
IF 0.9
Radiochemistry Pub Date : 2024-02-19 DOI: 10.1134/S1066362223060061
A. S. Obedkov, I. A. Bolshakova, E. V. Belova, G. V. Kostikova, O. A. Raitman, S. I. Stepanov
{"title":"Influence of Irradiation on the Stability of Extraction Mixtures Based on Methyltri-n-Octylammonium Carbonate","authors":"A. S. Obedkov,&nbsp;I. A. Bolshakova,&nbsp;E. V. Belova,&nbsp;G. V. Kostikova,&nbsp;O. A. Raitman,&nbsp;S. I. Stepanov","doi":"10.1134/S1066362223060061","DOIUrl":"10.1134/S1066362223060061","url":null,"abstract":"<p>The radiation thermal stability of extraction mixtures based on methyltrioctylammonium (MTOA) carbonate was studied. The volumes and maximum rate of release of gaseous products at atmospheric and elevated pressures were determined. No exothermic processes were shown to occur in the studied mixtures under experimental conditions. Irradiation up to a dose of 1 MGy has little effect on the density, viscosity, and surface tension of mixtures, but significantly reduces the phase separation rate. The distribution coefficients of Am(III) in the system of 50% MTOA carbonate in toluene are practically independent of the absorbed dose; however, irradiation can significantly affect the composition of the extractable americium complexes. The results of the study of extraction systems showed their high radiation thermal stability.</p>","PeriodicalId":747,"journal":{"name":"Radiochemistry","volume":"65 6","pages":"654 - 660"},"PeriodicalIF":0.9,"publicationDate":"2024-02-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139903202","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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