Archives → 2018 → Vol. 58, No. 5 → pp. 517-523
Article
The Accumulation and Distribution of 90Sr and 137Cs Radionuclides in the System “Water–Dense Sediments–Macrophytes” of Lake Kuyash
Kablova K.V., Deryagin V.V., Levina S.G., Sutyagin A.A.
The South Ural State Humanitarian-pedagogical University, Chelyabinsk, Russia
Abstract
The study is devoted to the analysis of the processes of accumulation and distribution of long-lived radionuclides 90Sr and 137Cs in the system «water–bottom sediments–macrophytes» of the Kuyash ecosystem of delayed water exchange (Chelyabinsk region). The features of redistribution of radioactive substances are shown to depend on the mechanical composition of the lake bottom sediments and the species composition of aquatic vegetation. The levels of content, as well as the total stock of radionuclides in the water mass, bottom sediments and macrophytes of the investigated reservoir at present are determined. The radiochemical ana-lysis data show that 97% of the total stock of 90Sr and 94% of the total stock of 137Cs are accounted for by bottom sediments. Comparison of the current levels of volumetric activity of the Lake Kuyash water mass with the level of intervention (NRB-09) indicates that the lake water does not require purification from radionuclides. Long-lived radionuclides of 90Sr, 137Cs from the water mass are mainly absorbed by bottom sediments and partly by macrophytes of the lake. Also, the reverse process of radionuclide desorption is possible, but not to a large extent. As a result of the integrated radioecological research, it has been revealed that Lake Kuyash is a fairly stable ecosystem at the present stage of its development; therefore its water components, bottom sediments and macrophytes are not the sources of secondary pollution.
Keywords
long-lived radionuclides, ecosystem, system "water-sediment-macrophyte", accumulation factor, contamination density, total stock of radionuclides
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