MONITORING OF 137CS CONTENT IN THE SOILS CONTAMINATED FROM THE CHERNOBYL ACCIDENT IN LONG THE RESIDUAL EFFECT OF LIMING AND VARIOUS INTENSITY OF FERTILIZER APPLICATION

The results of radiation monitoring of soils of agricultural lands in the areas contaminated by the Chernobyl accident are presented. The analysis of spatial and temporal changes shows that during the first 30 years after the accident, the levels of soil contamination of agricultural land have significantly decreased and their area has decreased, where the density of soil pollution exceeds the level of 1 CI/km2. At the same time, the number of subjects of the Russian Federation with agricultural lands with pollution level of more than 1 CI/km2 decreased from 18 (1993) to 9 (2014). However, serious problems of radio - active soil pollution remain in a number of areas of the Bryansk region, where the average content of 137Cs in soil exceeds the level of 5 CI/km2. This indicates that in these contaminated areas there will be significant risks of obtaining clean agricultural products within 2.5-4 half-life periods of 137Cs (80-120 years). When considering the General radiation situation on agricultural land in Russia, it is advisable to separate soils with a pollution density of 137Cs in the range of 0.3 – 1.0 Ki/km2 into a separate group.