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Distributions of 137Cs and 90Sr in the Soil of Uljin, South Korea
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 Title & Authors
Distributions of 137Cs and 90Sr in the Soil of Uljin, South Korea
Song, JiYeon; Kim, Wan; Maeng, Seongjin; Lee, Sang Hoon;
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Background: For the purpose of baseline data collection and enhancement of environmental monitoring the distribution studies of and in the soil of Uljin province was performed and the relation between surface soil activities and soil properties (pH, TOC and median of the surface soil) was analyzed. Materials and Methods: For 14 spots within 10 km from the NPP surface soil samples were collected and soils for depth profile were sampled for 3 spots in April 2011. Using -ray spectrometry with HPGe detector, the concentrations of were determined and the concentrations of were measured by counting -activity of (in equilibrium with ) in a gas flow proportional counter. Results and Discussion: The concentration ranges of and were < (avg. ) and (avg. ) which were similar to the reported values from other regions in Korea. The activity ratio of to in surface soils was around 9.67, which is much bigger than the initial value of 1.75 for worldwide fallouts because of faster downward movement of after fallout than that of . For depth profile studies soils were collected down to 40 cm depth for the locations of Deokgu, Hujeong and Maehwa. The concentration distribution of the first two showed maximum values at top soils and decreased rapidly in exponential manner, while showed two local maximum values for soils near top and about 30 cm depth. Through linear fittings between the and concentrations of surface soil and pH, TOC and median of the surface soil, the only probable relationship obtained was between and TOC (determination coefficient $R^2
Environmental radioactivity;;;Soil;Uljin;
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