| 厦门火烧屿裸露岩石的铀放射系不平衡 |
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| 引用本文： | 刘广山,徐茂泉,黄奕普.厦门火烧屿裸露岩石的铀放射系不平衡[J].地球学报,2003,24(6):618-621. |
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| 作者姓名： | 刘广山 徐茂泉 黄奕普 |
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| 作者单位： | 厦门大学海洋系，亚热带海洋研究所，福建厦门，361005;厦门大学海洋系，亚热带海洋研究所，福建厦门，361005;厦门大学海洋系，亚热带海洋研究所，福建厦门，361005 |
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| 基金项目： | 国家自然科学基金项目(40076024) |
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| 摘 要： | 用HPGeγ谱方法测定了厦门火烧屿裸露岩石天然放射性核素^40K、^228Ra、^228Th、^238U、^226Ra和^210Pb含量，对其铀系不平衡关系进行了讨论，发现钍系核素^228Ra和^228Th基本上是平衡的，而大部分样品^226Ra相对于^228U、^210Pb相对于^226Ra亏损。由此推论，水体作用下岸边岩石中^226Ra直接进入水体，可以是海水中^226Ra的一个来源；岸边岩石中^222Rn逸出后，衰变^210Pb再进入水体，可以是海水中^210Pb的一个来源。
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| 关 键 词： | 谱分析 裸露岩石 铀系不平衡 火烧屿 |
Uranium Series Disequilibrium in Naked Rocks from Huoshaoyu Island, Xiamen |
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| LIU Guang-shan,XU Mao-quan and HUANG Yi-pu.Uranium Series Disequilibrium in Naked Rocks from Huoshaoyu Island, Xiamen[J].Acta Geoscientia Sinica,2003,24(6):618-621. |
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| Authors: | LIU Guang-shan XU Mao-quan and HUANG Yi-pu |
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| Institution: | Department of Oceanography/Institute of Subtropical Oceanography, Xiamen University, Xiamen, Fujian, 361005;Department of Oceanography/Institute of Subtropical Oceanography, Xiamen University, Xiamen, Fujian, 361005;Department of Oceanography/Institute of Subtropical Oceanography, Xiamen University, Xiamen, Fujian, 361005 |
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| Abstract: | The natural radionuclides in naked rocks from Huoshaoyu island of Xiamen were measured by means of HPGe (spectroscopy,and the 40K, 228Ra, 228Th, 238U, 226Ra and 210Pb were detected. Based on a discussion on the disequilibrium of uranium series, it is found that in most samples 226Ra relative to 238U and 210Pb relative to 226Ra are deficient. It can thus be concluded that the migration of 226Ra from the coastal rocks into seawater by water leaching is a source of 226Ra in seawater and that the 210Pb formed by the decaying of 222Rn escaped from rocks is a source of 210Pb in seawater. |
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| Keywords: | spectrum analysis naked rock uranium series disequlibrium Huoshaoyu island |
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