A Study on Artificial Radionuclides(134Cs, 137Cs and 239+240Pu) Distribution in the Sediment from Lake Euiam

Title & Authors
A Study on Artificial Radionuclides(134Cs, 137Cs and 239+240Pu) Distribution in the Sediment from Lake Euiam
Kim, Seung Hwan; Lee, Sang-Han; Oh, Jung Suk; Choi, Jong Ki; Kang, Tae Gu;

Abstract
The objective of this study is to identify the radionuclide distribution in public water by carrying out the analysis of artificial radionuclides($\small{^{134}Cs}$, $\small{^{137}Cs}$, $\small{^{239+240}Pu}$), natural radionuclide($\small{^{210}Pb}$) and TOC in the lake Euiam sediment in Chuncheon, South Korea. The $\small{^{134}Cs}$ concentration in all lake sediments showed below MDA values, and the $\small{^{137}Cs}$ concentration in lake sediment were ranged from MDA to $\small{8.79Bq{\cdot}kg^{-1}-dry}$. The $\small{^{137}Cs}$ concentrations in surface sediment were reported to be 2.4 to $\small{4.2Bq{\cdot}kg^{-1}-dry}$. The lowest concentration of $\small{^{137}Cs}$ was reported at St. 4 and the highest concentration was reported at St. 3, respectively. The $\small{^{239+240}Pu}$ concentration in lake sediment were ranged from 0.049 to $\small{0.47Bq{\cdot}kg^{-1}-dry}$. The lowest concentration was reported at St. 2 and the highest concentration was reported at St. 3. The correlation(r) between the $\small{^{239+240}Pu}$ concentration and $\small{^{137}Cs}$ concentration in lake sediment presented higher values (0.54 to 0.97) and this suggests the behavior and origin of $\small{^{137}Cs}$ is identical to the $\small{^{239+240}Pu}$ in the sediment. The $\small{^{134}Cs}$ concentration below MDA value and the $\small{^{239+240}Pu/^{137}Cs}$ ratio(mean value of 0.041) indicated that the artificial radionuclides in the sediment were originated from global fallout by the atmospheric testing of nuclear weapons conducted by former USSR and U.S.A, but not from the Fukushima Daiichi NPP accident. The sedimentation rate derived from $\small{^{210}Pb}$ age-dating method at St. 2 is calculated to be $\small{0.31{\pm}0.06cm{\cdot}y^{-1}}$. This value is similar to the value ($\small{0.41{\pm}0.05cm{\cdot}y^{-1}}$) estimated from the $\small{^{137}Cs}$ maximum peak produced from early 1960's. The content of TOC in lake Euiam sediments varied from 0.20 to 13.01%. While the highest correlation between TOC and $\small{^{137}Cs}$ concentration in the sediment were found at St. 1, the others presented the low correlation.
Keywords
Lake sediment;$\small{^{134}Cs}$;$\small{^{137}Cs}$;$\small{^{239+240}Pu}$;$\small{^{210}Pb}$;TOC;
Language
Korean
Cited by
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