Radioactive contamination of the soil-plant cover at certain locations of Primorsky Krai, Sakhalin Island and Kamchatka Peninsula: Assessment of the Fukushima fallout

摘要

The contamination densities of soil plant cover at certain locations within the Primorsky Krai, Sakhalin Island and Kamchatka Peninsula attributable to Sr-90, (CS)-C-137 and (239,240) Pu were 500-1390 Bq m(-2), 980 -2300 Bq m(-2) and 37-74 Bq m(-2), respectively. These values do not exceed average global background levels, typical for mid-latitudes of the Northern Hemisphere. The spatial distribution of radionuclides depends on the climatic conditions of the region. A positive dependence of the Sr-90 and (CS)-C-137 contamination densities, as well as additional Cs-137 from NPP "Fukushima" in the soil, was determined based on the sum of annual atmospheric precipitation within the study areas. No trends in the spatial distribution of Pu isotopes were observed. The Cs-137 contribution from the "Fukushima" NPP constitutes 11-300 Bq m(-2) in the Primorsky Krai, Sakhalin Island and at the Kamchatka peninsula, i.e., 1-22% of the total amount of radionuclides in the soil. The contribution of this radionuclide to the contamination of moss -lichen vegetation ranged from 7 to 42%. 2017 Elsevier Ltd. All rights reserved.