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DISTRIBUTION OF RADIOCAESIUM IN ARCTIC MARINE SEDIMENTS
Abstract
The purpose of this research study is to identify the characteristics of marine sediments, which determine the accumulation of different radionuclides as a result of statistical analyses. The main attention is paid to the accumulation of radionuclides from the data on grain size and component-wise composition of sediments. Radioactive pollution is the result of various events: waste discharge of industrial waters, radioactive waste disposal and breakdowns on atomic submarines. Various areas of Russian Arctic seas such as Novaya Zemlya, Yenisei Gulf and Ob Gulf were exposed to significant emission of radioactive nuclides. Especially dangerous is the accumulation of radionuclides by marine sediments. Accumulation of radioactive isotopes in sediments contributes to the process of bioaccumulation of benthic organisms which leads to further deterioration of living conditions of all groups of aquatic organisms, causing a breach of the vital functions of organisms. The study was based on the material collected by various international expeditions from 1993 to 2009. On the basis of analysis of longitudinal data the dynamics of radiocaesium contamination of marine sediments is given. The spatial distribution of radiocaesium in marine sediments of the Arctic seas of Russia is considered.
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References14
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