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• W2885177583 abstract "The distributions of 137Cs, 237Np, and 239+240Pu activity concentrations in sedimentary soil cores of the volcanic crater-lake have been studied. The 240Pu/239Pu atom ratios measured by MC-ICP-MS and mutual activity ratios were examined. These results were used to evaluate the sedimentation characteristics of the crater-lake (Baengnokdam of Mt. Halla, Korea). The 137Cs, 237Np, and 239+240Pu activity concentrations showed similar distribution patterns and one maximum peak was observed in each sediment core, except at St.10. For all sediment cores, the activity concentrations were in the range 1.03 × 100–1.92 × 102 Bq·kg−1 dw for 137Cs, 7.56 × 10−3 – 7.15 × 100 mBq·kg−1 dw for 237Np, and 5.20 × 10−3 – 5.13 × 100 Bq·kg−1 dw for 239+240Pu, respectively. The averaged 240Pu/239Pu atomic ratio (0.159) was slightly less than the global fallout ratio (0.176). The averaged inventories were estimated to be 9.21 × 103±5.34 × 103 Bq·m−2 for 137Cs, 2.27 × 102±1.58 × 102 Bq·m−2 for 239+240Pu, and 3.22 × 10−1±1.78 × 10−1 Bq·m−2 for 237Np. The averaged 239+240Pu/137Cs and 237Np/239+240Pu activity ratios were 2.21 × 10−2 and 2.21 × 10−3, respectively. The mean sedimentation rates calculated using 239+240Pu activity concentrations at the central area (St.30 – St.45) and at all stations (St.5 – St.75) were estimated to be 0.844 cm yr−1, and 0.767 cm yr−1, respectively. In addition, the sedimentation rates calculated using 210Pb and 226Ra were 0.856 cm yr−1 at depths of 0–35 cm and 0.204 cm yr−1 at depths of 35–55 cm. These results imply that the sedimentation in Baengnokdam was relatively slow (0.204 cm yr−1) until about 44 years ago and then became faster (0.856 cm yr−1) to the present. The excess 210Pb dating is consistent with the sedimentation rate calculated from the vertical 239+240Pu profile." @default.
• W2885177583 created "2018-08-22" @default.
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• W2885177583 date "2018-12-01" @default.
• W2885177583 modified "2023-09-23" @default.
• W2885177583 title "Characteristics of artificial radionuclides in sedimentary soil cores from a volcanic crater lake" @default.
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• W2885177583 doi "https://doi.org/10.1016/j.jenvrad.2018.08.006" @default.
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