Сибирский федеральный университет

Тип публикации: статья из журнала

Год издания: 2024

Идентификатор DOI: 10.1134/S1066362224020127

Ключевые слова: sequential chemical fractionation, Radionuclide species, <sup>40</sup>K, nuclear legacy, Amorphous silicates, organic matter

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 ⁶⁰Co, ¹³⁷Cs, ¹⁵²Eu, ¹⁵⁴Eu, ¹⁵⁵Eu, and ²⁴¹Am. The species of radionuclides were studied using sequential extraction procedure. Considerable proportions of ⁶⁰Co (48–100%) and ¹³⁷Cs (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 ¹⁵²Eu), but their representation as relatively mobile species was more diverse compared to ⁶⁰Co and ¹³⁷Cs. Interestingly, some percentage of ¹⁵²Eu (up to 15.5%) was retained in the most mobile, exchangeable, form. The species of ¹⁵⁴Eu and ¹⁵²Eu 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.

Журнал: Radiochemistry

Выпуск журнала: Т.66, №2

Номера страниц: 227-234

ISSN журнала: 10663622

Место издания: Санкт-Петербург

Издатель: Pleiades Publishing, Ltd. (Плеадес Паблишинг, Лтд)

• Zotina T.A. (Siberian Federal University)
• Alexandrova Yu.V. (Institute of Biophysics, Krasnoyarsk Science Center, Siberian Branch, Russian Academy of Sciences)
• Chuguevsky A.V. (Siberian Federal University)
• Melgunov M.S. (Institute of Geology and Mineralogy, Siberian Branch, Russian Academy of Sciences)

• Ядро РИНЦ (eLIBRARY.RU)