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Abstract. The data on assessment of the irradiation doses of the Chernobyl 239, 240 Pu to the Black Sea hydrobionts of different trophic levels are presented. The rates of adsorbed doses of internal irradiation from the alpha-radiation of incorporated 239, 240 Pu to the Black Sea hydrobionts varied from 0.01 to 0.354 Gy · years −1 Comparative analysis of dose levels formed with 239, 240 Pu to studied hydrobionts of the Black Sea in this work and doses formed with natural alpha-emitting radionuclide of 210 Po showed that 239, 240 Pu irradiation doses are 10 3 -10 4 times lower, than irradiation doses with 210 Po. Hence, doses created with 239, 240 Pu to the Black Sea hydrobionts were in n · 10 6 -10 7 times less than the dose level offered by International Atomic Energy Agency (IAEA), at which there are no negative consequences in populations of aquatic organisms.

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