Библиографическое описание:New data on mobility of transuranium elements in sediments of the Yenisei River : научное издание / A. Bolsunovsky, R. Borisov, M. Melgunov. - Текст : непосредственный // Journal of Environmental Radioactivity. - 2023. - Т. 270, № . - P. 107285. - The authors are grateful to Dr. Dmitry Dementyev (Institute of Biophysics SB RAS, Krasnoyarsk) for his help in γ-spectrometric measurements of samples and to Irina Makarova (Institute of Geology and Mineralogy SB RAS, Novosibirsk) for radiochemical separation of plutonium, The study was partly supported by the Russian Science Foundation (Project No. 22-27-20001) and the Krasnoyarsk Regional Fund of Science. - ISSN 0265-931X. - ISSN 1879-1700, DOI 10.1016/j.jenvrad.2023.107285.
Аннотация:The inflow of transuranium elements to the Yenisei River was previously associated with the production of weapons-grade plutonium at the Mining-and-Chemical Combine (MCC, Zheleznogorsk, Russia), but the source of transuranium elements in the River today is fabrication of MOX fuel that started recently at the MCC. The current study presents results of sequential chemical extraction of radionuclides from sediment samples collected in 2014 and 2020 in two areas near the MCC discharge site and compares these results with the data obtained previously by sequential extraction of sediments collected during 1999–2007. Over the study period, the strength of binding of 137Cs and 60Co in the Yenisei River sediments was high (up to 100%) and remained so, while the percentages of 241Am and 152Eu in residual solids after sequential extraction increased considerably and the percentage of 239,240Pu in residual solids decreased in samples from all study areas. In samples collected at the position located close to the MCC discharge site, the percentages of the strongly bound 241Am and 152Eu as well as 239,240Pu were lower than in the samples from the other positions. The study demonstrated an enormous increase in 239,240Pu activity concentration in the top sediment layers collected at all positions in 2020 relative to 2014. In the same period, as literature data suggest, 239,240Pu activity concentrations also increased in aquatic organisms of the Yenisei River, which can be indicative of the growing potential bioavailability of plutonium in the aquatic ecosystem, which could be caused by the presence of the mobile form of plutonium in the routine discharges from the MCC.
Издательство:Elsevier Science Publishing Company, Inc.
Источник:Journal of Environmental Radioactivity
Выпуск:Т. 270
Номера страниц:107285
Держатель оригинала документа:Institute of Biophysics, Federal Research Center “Krasnoyarsk Science Center” Siberian Branch of the Russian Academy of Sciences, Institute of Chemistry and Chemical Technology, Federal Research Center “Krasnoyarsk Science Center” Siberian Branch of the Russian Academy of Sciences, V.S. Sobolev Institute of Geology and Mineralogy, Siberian Branch of the Russian Academy of Sciences
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