| Non-destructive γ spectrum analysis of polymetallic nodules from the eastern Pacific |
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| 作者姓名： | Liu Guangshan Huang Yipu Cai Yihu Chen Min |
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| 作者单位： | Liu Guangshan,Huang Yipu,Cai Yihua,Chen Min1. Department of Oceanography,Xiamen University,Xiamen 361005,China |
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| 基金项目： | This study was supported by the National Scientific,Technological Project of China in the "Ninth-Five Year Plan" under contract No. DY95 - 02 - 15. |
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| 摘 要： | Non-destructive 7 spectrum analyses of 20 polymetallic nodules from the eastern Pacificwere carried out. Numerous nuclides, such as 238U,230Th,226Ra,210Pb,228Ra,228Th,235U,227Ac (or 231 Pa) and 40K were detected. The count rates of the nuclides in the top or bottom side of nodules facing detector were measured and the ratio R of the count rates of nuclides in the top and the bottom sides was obtained. From counts and ratios, some useful information relating to the growth and movement of the nodules, the source of nuclide and relationship between those and environment can be gotten. A new method for clear distinction between the top and bottom sides of the nodule based on the R value of 226Ra or 210Pb was developed. In addition, one can infer the turnover of nodules according to the R value of 230Th.
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| 关 键 词： | The eastern Pacific polymetallic nodule radionuclide γ-spectrometry |
| 收稿时间： | 2002/3/26 0:00:00 |
| 修稿时间： | 2002/4/15 0:00:00 |
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