The results of researches of the spices-specificity, accumulation dynamics, and distribution of <$E ~sup 90 roman Sr>, <$E ~sup 137 roman Cs>, and transuranic elements in fish of the Chernobyl NPP exclusion zone are analyzed. For fish of lakes of the left-bank floodplain of the Pripyat River, the increase of the specific activity of <$E ~sup 90 roman Sr> is registered, which is presumably connected to the dynamics of physico-chemical forms of the radionuclide in soils and their wash out in water basins from the catchment territory. Now about 90 % of the internal dose rate of fish from closed aquatic ecosystems within the Chernobyl NPP exclusion zone are caused by the <$E ~sup 90 roman Sr> incorporation.

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