Sr/Cs ratios in soil of epicentral zones of «Experimental Field» testing site of Semipalatinsk Test Site.

The paper presents the results of Sr/Cs isotopic ratios in the soil surface layer in the venues of surface and atmospheric nuclear tests at the territory of the «Experimental Field » site of the Semipalatinsk Test Site. One of the main factors in the radiation impact of a nuclear explosion on the environment is the decay of fission products. The determination of Cs activity in soil is carried out by accurate, rapid and sufficiently cheap gamma-spectrometric method, while the existing methods of determining Sr activity are quite problematic: they either have sufficiently high detection limits or are time-consuming.