137Cs SPECIFIC ACTIVITY OF VERTICAL DISTRIBUTION IN AGRARIAN LANDSCAPE IN CENTRAL PARTS OF KRASNOYARSK REGION

The purpose of the study is to determine the migration activity of 137Cs according to the soil profile in agricultural landscapes with additional radioactive contamination. An extensive literature review is provided, reflecting technogenic radioactive contamination of territories, features of 137Cs migration activity on various types of soils and the depth of 137Cs migration along the profile of soils of agrobiocenoses contaminated as a result of radiation accidents on the territory of the Russian Federation. The paper is devoted to assessing the specific activity and determining the vertical migration of 137Cs in soils and agricultural landscapes of the central regions of the Krasnoyarsk Region. Based on a radioecological survey of the territory of the central regions of the region, the author identified agricultural landscapes with additional technogenic pollution. It has been established that the average value of ambient dose equivalent rate (ADR) in the agricultural landscapes of the region corresponds to the range of values characteristic of the territory of the Krasnoyarsk Region. In an agricultural landscape without radiation load, the density of soil contamination with 137Cs s was 0.04 Ku/km2, in landscapes with additional technogenic pollution – 0.78; 1.84 Ku/km2. The value of the specific activity of 137Cs in the soils of hay-pasture agrobiocenoses of agricultural landscapes with technogenic pollution exceeds the average for the Krasnoyarsk Region, according to regional standards “Permissible values of radiation pollution of the natural environment in the Krasnoyarsk Region”, corresponds to the “registration” level. The vertical distribution of 137Cs in soils of agricultural landscapes with anthropogenic load indicates the predominant accumulation of technogenic radionuclides in the 10–20 cm layer. In the observation zone of the Federal State Unitary Enterprise Mining and Chemical Combine, the depth of migration of 137Cs in the soils of agrobiocenoses with additional technogenic load is 40 cm, which confirms the assumption that some areas have been contaminated as a result of the previous activities of the enterprise.