Monitoring of ³⁷C, ⁹⁰Sr and ⁴⁰Kin Sod-Podzolic Soils and Plants of Reference Sites of the Ivanovo Region

The results of radiation monitoring of sod-podzolic soils of reference agricultural plots of the Ivanovo region, conducted in 2014 and 2021, are presented. Background values of the specific activities of the studied radionuclides in the soils of reference sites have been established. According to the pollution density of the arable horizon of soils ¹³⁷Cs and ⁹⁰Sr, the level of the ecological situation was determined, which made it possible to attribute the soils of all reference areas of the region to uncontaminated territories suitable without restrictions for agricultural use. The power of the exposure dose of gamma radiation of soils and the contribution of ⁴⁰K and ¹³⁷Cs to the formation of the gamma background of soils were determined. Correlation analysis determined the influence of individual physical and chemical properties of soils on the behavior and distribution of radionuclides in the soil and the relationship between the content of the radionuclides themselves. Based on the values of the specific activity of ¹³⁷Cs and ⁹⁰Sr in plant products grown in 2014 and 2021, rows of cultivated plants with a decreasing ability to accumulate these radionuclides from the soil were constructed. All grown plant products of all types of crops fully met the veterinary standards required to limit the content of ¹³⁷Cs and ⁹⁰Sr in plant feeds (green mass, straw and feed grain). The coefficients of accumulation and transition of ¹³⁷Cs and ⁹⁰Sr from soil to plants are calculated. The coefficients of linear correlation between the values of the specific activity of ¹³⁷Cs and ⁹⁰Sr in soils and plants revealed the strength and nature of these dependencies.