Authors:
Besik Kalandadze, Eremia Tulashvili, Giorgi Dvalashvili, Antaz Kikava, Merab Mgeladze |
Abstract:
One of the cardinal problems in the area of ecological researches is natural and anthropogenic radioactivity of environment. The main purpose of this work is determination of radioactivity in various types of soil in the Black Sea coastal strip in the West Georgia. Numerous settlements are located in this region which is a zone of sea resorts. Samples have been selected in 9 control points in this territory (soil types - alluvial soil, red soil), and also in 2 control points located outside of this zone (soil types - yellow soil and podzolic soil) for carrying out of the comparative analysis. Up to 22 radionuclides have been identified in these samples. Concentration of radionuclides of Th-232 family (in total 6 identified radionuclides) ranged from 12.5 to 32.5 Bq/kg with average value of 22.8 Bq/kg, U-238 family (in total 7 radionuclides) – from 13.4 to 28.3 Bq/kg with average value of 19.3 Bq/kg, U-235 family (in total 7 radionuclides) – from 0.62 to 1.31 Bq/kg with average value of 0.89 Bq/kg. Concentration of Pb210 almost in all samples considerably exceeded equilibrium value. Also single radionuclides have been identified – Be-7 (activity up to 29.5 Bq/kg), K-40 (from 81.1 to 485 Bq/kg) and Cs137 (from 8.8 to 191 Bq/kg). The value of radium equivalent activity varied in the range from 48.6 to 93.1 Bq/kg with average value of 74.0 Bq/kg, thus the greatest values were observed for alluvial soil and yellow soil, and the least value - for podzolic soil. The annual outdoor effective dose ranged from 29 to 56 ?Sv/y with average value of 44 ?Sv/y. Certain features in radionuclides distribution have been noted, and comparison with literary data has been carried out. |
