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Vol.3 , No. 3, Publication Date: May 16, 2018, Page: 57-67
&description=The aim of the present work is to determine the radionuclide content and radioactivity in various types of soil in the territory of Kvemo Kartli (Georgia). Within this territory samples of soil of various types [cinnamonic (Cn), cinnamonic leached (Cn-Ld), cinnamonic calcareous (Cn-Cr), grey cinnamonic dark (GCD), chernozems (Cz), and brown forest weakly unsaturated (BFWU)] were selected at 28 locations. Up to 22 radionuclides were identified in these samples. The mean (range) concentration of radionuclides of the Th-232 family (six identified radionuclides in total) was 27.0 (12.9-64.9) Bq/kg, that of the U-238 family (seven radionuclides in total) was 24.0 (10.2-47.9) Bq/kg, and that of the U-235 family (six radionuclides in total) was 1.1 (0.49-2.3) Bq/kg. Individual radionuclides were also identified: Be-7 [28.9 (16.1-42.6) Bq/kg)], K-40 [475 (290-942) Bq/kg], and Cs-137 [15.6 (0.2-88.1) Bq/kg]. Mean radium equivalent activity was 102 (57.1-210) Bq/kg; therein, the greatest values were observed for soil GCD, Cn-Ld, and Cn and slightly smaller ones for Cz, Cn-Cr and BFWU. Mean annual effective dose was 0.058 (0.035-0.122) mSv/y. Some features of radionuclides distribution were marked, in particular, depending on the soil type and sampling location. Some activity ratios of radionuclides were considered, in particular, U-238/U-235, U-238/Th-232, Ra-226/U-238, and Pb-210/Ra-226 (in the last case appreciable deviations in the positive direction from the equilibrium value were observed – up to 6.87 with an average value of 2.29; therein, a certain correlation with features of geotectonic structure in the studied territory was marked). Comparison with reference data was carried out.&picture=http://www.aascit.org/aascit/decorators/img/journal/805.jpg)
| [1] | Nodar Kekelidze, Material Research Institute, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia; Semiconductor Materials Science Laboratory, Ferdinand Tavadze Metallurgy and Materials Science Institute, Tbilisi, Georgia; Department of Engineering Physics, Faculty of Informatics and Control Systems, Georgian Technical University, Tbilisi, Georgia. |
| [2] | Teimuraz Jakhutashvili, Material Research Institute, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia. |
| [3] | Bezhan Tutberidze, Department of Geology, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia. |
| [4] | Eremia Tulashvili, Material Research Institute, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia. |
| [5] | Mariam Akhalkatsishvili, Department of Geology, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia. |
| [6] | Lela Mtsariashvili, Material Research Institute, Faculty of Exact and Natural Sciences, Ivane Javakhishvili Tbilisi State University, Tbilisi, Georgia. |
The aim of the present work is to determine the radionuclide content and radioactivity in various types of soil in the territory of Kvemo Kartli (Georgia). Within this territory samples of soil of various types [cinnamonic (Cn), cinnamonic leached (Cn-Ld), cinnamonic calcareous (Cn-Cr), grey cinnamonic dark (GCD), chernozems (Cz), and brown forest weakly unsaturated (BFWU)] were selected at 28 locations. Up to 22 radionuclides were identified in these samples. The mean (range) concentration of radionuclides of the Th-232 family (six identified radionuclides in total) was 27.0 (12.9-64.9) Bq/kg, that of the U-238 family (seven radionuclides in total) was 24.0 (10.2-47.9) Bq/kg, and that of the U-235 family (six radionuclides in total) was 1.1 (0.49-2.3) Bq/kg. Individual radionuclides were also identified: Be-7 [28.9 (16.1-42.6) Bq/kg)], K-40 [475 (290-942) Bq/kg], and Cs-137 [15.6 (0.2-88.1) Bq/kg]. Mean radium equivalent activity was 102 (57.1-210) Bq/kg; therein, the greatest values were observed for soil GCD, Cn-Ld, and Cn and slightly smaller ones for Cz, Cn-Cr and BFWU. Mean annual effective dose was 0.058 (0.035-0.122) mSv/y. Some features of radionuclides distribution were marked, in particular, depending on the soil type and sampling location. Some activity ratios of radionuclides were considered, in particular, U-238/U-235, U-238/Th-232, Ra-226/U-238, and Pb-210/Ra-226 (in the last case appreciable deviations in the positive direction from the equilibrium value were observed – up to 6.87 with an average value of 2.29; therein, a certain correlation with features of geotectonic structure in the studied territory was marked). Comparison with reference data was carried out.
Keywords
Radionuclides, Soil, Activity Concentration, Activity Ratio, Exposure Dose, Georgia
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