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ACCUMULATION OF RADIONUCLIDES IN BOTTOM SEDIMENTS OF VARIOUS TYPES WATERBODIES IN THE CHERNOBYL NUCLEAR POWER PLANT EXCLUSION ZONE
Abstract
Significant differences were found in the degree of penetration of 137Cs, 90Sr, and 241Am into the bottom sediments depending on the type and origin of the waterbody. In most cases, the upper 10 cm layer of bottom sediments is the most contaminated, but the degree of penetration of 137Cs, 90Sr, 241Am in it is higher than the observed values for soils. 90Sr migrates most deeply. The highest content of radionuclides is found in closed and low-flowing waterbodies, such as isolated floodplain lakes in the Pripyat river catchment area, channels of the former reclamation network, and seasonal wetlands that occur on lowering the relief. It has been established that the levels of radioactive contamination of bottom sediments of reservoirs in the exclusion zone of the Chernobyl accident is lower than that of soils in the catchment area. A positive correlation was revealed between the content of organic matter in bottom sediments and their degree of radioactive contamination.
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