Retrospective Estimation of Potential Mobility of Artificial Radionuclides (60Co, 137Сs, 152Eu, 154Eu) in Bottom Sediments of the Yenisei River : научное издание
Библиографическое описание:Retrospective Estimation of Potential Mobility of Artificial Radionuclides (60Co, 137Сs, 152Eu, 154Eu) in Bottom Sediments of the Yenisei River : научное издание / T. A. Zotina [et al.]. - Текст : непосредственный // Radiochemistry. - 2024. - Т.66, №2. - P. 227-234. - The work was supported by a grant from the Russian Science Foundation and the Krasnoyarsk Regional Fund for the Support of Scientific and Scientific-Technical Activities no. 23-27-10049. - ISSN 1066-3622. - ISSN 1608-3288, DOI 10.1134/S1066362224020127.
Аннотация:The present study addresses transformation of physicochemical forms (species) of artificial radionuclides in bottom sediments (BS) of the Yenisei River after the shutdown of the reactors at the Mining-and-Chemical Combine (MCC) at Krasnoyarsk. The BS samples collected from the Yenisei at the MCC in 2018–2021 contained <sup>60</sup>Co, <sup>137</sup>Cs, <sup>152</sup>Eu, <sup>154</sup>Eu, <sup>155</sup>Eu, and <sup>241</sup>Am. The species of radionuclides were studied using sequential extraction procedure. Considerable proportions of <sup>60</sup>Co (48–100%) and <sup>137</sup>Cs (72–83%), which are still released to the Yenisei with controlled discharges, were irreversibly bound to BS mineral solids. The percentages of europium isotopes, which have not been released to the Yenisei as part of controlled discharges since 2013, were lower in the irreversibly bound fraction (4.6–9.3% of <sup>152</sup>Eu), but their representation as relatively mobile species was more diverse compared to <sup>60</sup>Co and <sup>137</sup>Cs. Interestingly, some percentage of <sup>152</sup>Eu (up to 15.5%) was retained in the most mobile, exchangeable, form. The species of <sup>154</sup>Eu and <sup>152</sup>Eu differed, which can be explained by dissimilar origins of these isotopes. Further research is needed to investigate the mechanisms of physicochemical transformation of radionuclides in BS that enable them to be present in mobile species over long time periods and mechanisms of immobilization of artificial radionuclides in the environment.
Издательство:Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд), Санкт-Петербург
Источник:Radiochemistry
Выпуск:Т.66, №2
Номера страниц:227-234
Держатель оригинала документа:Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences, Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences, Siberian Federal University
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