7Be Fallout and its distribution in soil profile of Nanjing Region in later spring

摘要

With the method of experimental analysis, 7Be Fallout and its distribution in soil profile in later spring was analyzed in Nanjing region. The results showed that: the specific activity of 7Be on later spring rain in Nanjing was 0.85–2.62Bq/L; the concentration of 7Be in rainwater appeared decreased gradually; the total atmospheric wet deposition of 7Be was 128.66 Bq/m2, and the contribution rate of 7Be in atmospheric dry deposition was smaller. The reference inventories of 7Be in the four dates were: 249.17Bq/m2, 234.77Bq/m2, 267.12Bq/m2 and 272.14Bq/m2, and the distribution trend of the reference inventories of 7Be in soil profile was decreasing exponentially with depth, the total depth of 20mm.