| 黄河下游及河口区表层沉积物中U,Ra,Th,40K和137Cs的测定 |
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| 引用本文： | 李培泉,刘志和.黄河下游及河口区表层沉积物中U,Ra,Th,40K和137Cs的测定[J].海洋科学,1990,5(5):39-42. |
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| 作者姓名： | 李培泉 刘志和 |
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| 作者单位： | 中国科学院海洋研究所;山东医学科学院 |
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| 摘 要： |
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| 关 键 词： | 黄河 河口 表层 沉积物 放射性元素 |
DETERMINATION OF RADIOISOTOPES IN SURFACE SEDIMENT FROM LOWER REACH AND ESTUARY OF HUANGHE RIVER |
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| Abstract: | Determination by 8180-4K multichannel Ge(Li) spectrometer of five important radioisotopes(U, Ra, Th, 40K and 137Cs) in surface sediments from lower reaches and estuary of Huanghe river and investigation of their contents and distribution show that the contents of U, Ra, Th are higher in lower reach than in estuary of Huanghe River, that of 137Cs and 40K are higher in estuary than in lower reach. This distribution pattern may be related to their chemical properties and hydrological environmental condition, for example, K is affected by seawater and 137Cs by suspends. The Th/U ratio is little higher in estuary than in lower reach of Huanghe river, but U/Ra ratio is less in estuary than in lower reach. It demonstrates that U is more active than Th and Ra. |
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| Keywords: | FWHM(full width at half maximum) activity Standard source |
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