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.
The work is focused on the study of characteristics of sedimentational self-purification from radioactive and conservative chemical pollutants in Sevastopol Bay waters. Using data on the distribution of ⁹⁰Sr, ¹³⁷Cs, 239,240 Pu, ²¹⁰Po, Hg, ΣPCB₅, and ΣDDT in the surface (0-5 cm) layer of bottom sediments in different areas of the bay, it is shown that the concentrating ability of living and inert matter concerning contaminants (characterized by the concentration coefficient) is one of the major parameters in realization of biogeochemical mechanism of water self-purification. The effect of sedimentation processes is aimed at maintaining the radionuclides and chemical homeostasis of marine ecosystems by the Le Chatelier-Brown principle. Hg, ΣPCB₅ and ΣDDT are shown to be the main pollutants of Sevastopol Bay waters at present.
Abstract. The naturally occurring radionuclide 210 Po was determined in different components of the Black Sea ecosystem. The specific activity of 210 Po in water in the open part of the sea was about 1 Bq · m −3 . The range of 210 Po specific activity in bottom sediments was 4.5-500 Bq · kg −1 dry weight depending on their type, area and depth of collection. The highest values were found in the NW part of the Black Sea. Sediment distribution coefficients (Kd) of 210 Po for bottom sediments, calculated on a dry weight basis, varied from 0.5 × 10 4 to 5 × 10 5 . The levels of 210 Po specific activity in molluscs and pelagic fishes anchovy and sprat were the highest among the investigated species of the Black Sea biota. Concentration factors (CF) of 210 Po, estimated on a wet weight basis, reached 1.5 × 10 3 for macrophytes, 4 × 10 3 for total zooplankton, 10 3 -10 4 for the entire fishes depending on their ecological groups affiliation and (0.7-6.0) × 10 4 for molluscs. So, the ability of the Black Sea biota to accumulate the natural radionuclide 210 Po is comparable with that of similar species from others marine and oceanic areas.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.