Results of the slash geochemical method application for radionuclide contamination mapping on the Semipalatinsk nuclear test site

In the paper the first results obtained during studies on the topic 'Geo-radio-ecological mapping of the former nuclear sites by the express methodic base development' are given. Key tasks which have been solved during the first stage of works are as follows: - determination of principal possibility the local technogenous radionuclides anomalies identification by the way of the slash geochemical search conducting by scattered flows; - Clarification of enrichment level by radionuclides with a different granulometric and elemental fractions in the collected samples. In the results of analytical works it was established, that: a specific activity of 134Cs, 60Co and (152-154)Eu in the assays are on the trace level; natural radionuclides content does not exceeds the quark one; a specific activity of technogenous radionuclides makes up (Bq/kg): for Pu - 1-99, Sr - 5--113, Cs - 14-155. It is concluded, that principally the clay fractions is enriched by radionuclides (grain size <0.1 mm); radionuclides, plutonium and strontium including, are transferring by scattering flows with clay fraction; a principal possibility of local anomalies determination by the way of slash geochemical survey by the scattering flows us established