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LEVELS OF RADIONUCLIDE CONTAMINATION OF FISH OF VERSHYNA LAKE IN THE CHORNOBYL EXCLUSION ZONE
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LEVELS OF RADIONUCLIDE CONTAMINATION OF FISH OF VERSHYNA LAKE IN THE CHORNOBYL EXCLUSION ZONE
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Conference Proceeding
LEVELS OF RADIONUCLIDE CONTAMINATION OF FISH OF VERSHYNA LAKE IN THE CHORNOBYL EXCLUSION ZONE
2022
Overview
The levels of specific activity of90Sr and137Cs in fish of one of the most polluted reservoirs of the Chornobyl Exclusion Zone (ChEZ) - Vershyna Lake. During the research period from 2011 to 2021 for all studied fish of the lake. The peak ranges of the specific activity of radionuclides are noted at the level of 32960-213300 (average value 67832±22936) Bq/kg for90Sr and 838-25907 (4811±569) Bq/kg for137Cs. It is shown that at the current stage, the specific activity of90Sr in the ichthyofauna of the lake exceeds the permissible levels, which are accepted in Ukraine for fish products in more than 942-6094, and137Cs - in 6-173 times. The90Sr/137Cs ratio in lake fish is in the range of 3-108. The distribution of radionuclides in the organs and tissues of silver crucian carp is given. Estimated dose rate of fish irradiation of the Vershyna Lake. As shown by the results of studies of the ichthyofauna of Vershyna Lake , the maximum average dose rate irradiation was noted in representatives of bentophagous Prussian carp (149,5±12,1 µGy/h), the minimum - in the pelagic Sunbleak (56,2±5,1 µGy/h). It was noted, that90Sr is the dominant radionuclide in the formation of the total radiation dose of fish from Vershyna Lake (in contrast to all other investigated reservoirs of the ChEZ).
