Distribution of gamma-radiation dose rate in Glyboke lake hollow (Chornobyl exclusion zone)

. Nazarov*, D. Gudkov**, Ch. Ganzha**, D. Ganzha***

*Sevastopol National University of Nuclear Energy and Industry
7, Kurchatov St., Sevastopol 99015, Ukraine
**Institute of Hydrobiology of NAS of Ukraine
12, Geroyiv Stalingrada Ave., Kyiv 04210, Ukraine
***Vasyl Stefanyk Precarpathian nazarov42t@rambler.ru

137Cs lateral and vertical distribution regularities for Glyboke Lake hollow was executed. An investigation point was conducted by field radiometry and laboratory spectrometry of the lake sediments. Determinations of basic gamma-active radionuclides in the samples of the lake sediments showed that more than 99% dose-rate is formed by 137Cs. Information of gamma-radiometry can be used for the estimation of bottom sediment contamination by cesium for biocenosis research. The conducted investigation showed that the distribution of 137Cs in a hollow did not correspond to lake isobaths, but repeats the contour of primary nuclear fall-out. The redistribution of 137s takes place under act of exchange of matters in ecological system of lake as a result of radionuclides accumulation by hydrobionts, fall to the bottom sediment as a result of organisms dying.

Keywords: cesium-137, Chornobyl NPP exclusive zone, dose rate, ecology, gamma-radiometry, soil

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