Abstract
Field gamma-sensing under conditions of intense radioactive contamination has shown high productivity in studying the migration sediment associated pollutants via erosion and accumulation processes. The purpose of the presented work is to evaluate the applicability of compact gamma detectors without a collimator that narrows the area of gamma radiation registration to determine the vertical distribution of Chernobyl-derived 137Cs. Accum-ulative strata of sediments formed within the “Plavsk radioactive hot spot” in the southern part of the Tula region were chosen as the object of research. By comparing the obtained vertical distribution of the gamma quantum counting rate and the actual distribution of 137Cs deposits, the resulting distortions in the estimation of the relative vertical distribution of radionuclides in the soil were considered, limiting the applicability of the proposed measurement scheme. The main prospects for further application of the gamma-sensing technique of soil cover at relatively high concentrations of radionuclides in accumulated sediments were identified.
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