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KMID : 0364920160410010049
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Journal of Radiation Protection and Research
2016 Volume.41 No. 1 p.49 ~ p.55
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Distributions of 137Cs and 90Sr in the Soil of Uljin, South Korea
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Song Ji-Yeon
Kim Wan
Maeng Seong-Jin
Lee Sang-Hoon
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Abstract
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Background: For the purpose of baseline data collection and enhancement of environmental monitoring the distribution studies of 137Cs and 90Sr 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 γ-ray spectrometry with HPGe detector, the concentrations of 137Cs were determined and the concentrations of 90Sr were measured by counting β-activity of 90Y (in equilibrium with 90Sr)
in a gas flow proportional counter.
Results and Discussion: The concentration ranges of 137Cs and 90Sr were <0.479-39.6 Bq? (kg-dry)-1 (avg. 7.51 Bq?(kg-dry)-1) and 0.209-1.85 Bq?(kg-dry)-1 (avg. 0.74 Bq?(kg-dry)-1) which were similar to the reported values from other regions in Korea. The activity ratio of 137Cs to 90Sr 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 90Sr after fallout than that of 137Cs. For depth profile studies soils were collected down to 40 cm depth for the locations of Deokgu, Hujeong and Maehwa. The 137Cs concentration distribution of the first two showed maximum values at top soils and decreased rapidly in exponential
manner, while 90Sr showed two local maximum values for soils near top and about 30 cm depth. Through linear fittings between the 137Cs and 90Sr concentrations of surface soil and pH, TOC and median of the surface soil, the only probable relationship obtained was between 137Cs and TOC (determination coefficient R2=0.6).
Conclusion: The concentration ranges of 137Cs and 90Sr in Uljin were similar to the reported values from other regions in Korea. The only probable relationship obtained between activities and soil properties was between 137Cs and TOC.
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KEYWORD
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Environmental radioactivity, 137Cs, 90Sr, Soil, Uljin
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