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題名 | 陙Pu/陖Pu Ratios in Sun Moon Lake Sediments:Implications for Sources of Nuclear Fallout in Taiwan=從日月潭沈積物中陙 Pu/陖Pu比值看臺灣地區核爆落塵之來源 |
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作者 | 扈治安; Huh, Chih-an; |
期刊 | Terrestrial, Atmospheric and Oceanic Sciences |
出版日期 | 19970900 |
卷期 | 8:3 1997.09[民86.09] |
頁次 | 頁289-294 |
分類號 | 351.983 |
語文 | eng |
關鍵詞 | Plutonium; Nuclear fallout; Sun moon lake; |
英文摘要 | The isotopic composition of plutonium in dated Sun Moon Lake sediments was determined by mass spectrometry in an effort to trace the source(s) and timing of nuclear fallout in Taiwan. The Pu/Pu ratios in the sediment core vary by a factor of>5, with the highest ratio, 0.22, corresponding to the maximum level of nuclear fallout in 1963 and the lowest ratios, 0.04-0.06, being identified at two time horizons:1982-83 and 1992-93. At other depth intervals, the Pu/Pu ratios fall within 0.15-0.19. The data indicate that global fallout from the stratosphere is the dominant source of Pu in the sediments, whereas the tropospheric transport of low burn-up debris from Lop Nor in NW China is mostly responsible for the unusually low Pu/Pu ratios. |
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