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Distribution of environmental radionuclides in sediment cores of the Jinheung catchment

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Abstract

Sediment core samples taken from the Jinheung catchment located in the middle of the Korean Peninsula were used to know environmental radionuclide distribution. The grain sizes of the sediment cores were found at depth of about 17 cm suggesting that it might have occurred during a dry period of 1969. The radionuclides, 137Cs, 237Np, 239Pu, 240Pu, 234U, 238U, 228Th, 230Th, 232Th, were analyzed by sector type ICP-MS and gamma-spectrometry. The Cs and Pu distribution changed with the depth, in which the maximum ranged from 14 to 22 cm. This was due to the high activity of the results of nuclear bomb tests in the air from 1960s and showed different distribution pattern on the soil surface. The average activity ratio of 240Pu/239Pu and 237Np/239Pu was 0.173 and 0.45, respectively. These values were similar to the north hemisphere global fallout ratio of 240Pu/239Pu (0.18) and 237Np/239Pu (0.45). The 237Np/239Pu ratio showed a higher value than the global fallout ratio above 14 cm depth. The U, Th and their daughter radionuclides kept secular equilibrium in the sediment core because the average activity ratios were nearly 1.

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Authors and Affiliations

  1. Korea Institute of Geoscience and Mineral Resources, Daejeon, Korea

    Yoon Yeol Yoon, Dong Yoon Yang, Wook Hyun Nahm, Soo Young Cho & Kil Yong Lee

  2. Korea Institute of Nuclear Safety, Daejeon, Korea

    Chul Soo Kim

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  1. Yoon Yeol Yoon
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  2. Chul Soo Kim
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  4. Wook Hyun Nahm
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Correspondence to Yoon Yeol Yoon.

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Yoon, Y.Y., Kim, C.S., Yang, D.Y. et al. Distribution of environmental radionuclides in sediment cores of the Jinheung catchment. J Radioanal Nucl Chem 276, 187–191 (2008). https://doi.org/10.1007/s10967-007-0431-7

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  • DOI: https://doi.org/10.1007/s10967-007-0431-7

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