| 摘要: |
| 通过对1991年5月－1992年10月间采自江苏固城湖和安徽女山湖的3个沉积孔往中人工放射性核素137Cs比度垂直分布的分析研究，发现在该地区切尔诺贝利核事故泄漏137Cs有明显的蓄积，其峰值与核武器试验导致的1963年137Cs时标最大蓄积峰值相当，具有同样的时标意义。因此，在苏皖地区这一137Cs蓄积峰值对研究现代湖泊沉积、水土流失和区域环境变化等都有重要价值。 |
| 关键词: 切尔诺贝利核事故泄漏137Cs 湖泊沉积物 时标 |
| DOI： |
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| 基金项目:中国科学院“八五”重点项目，Z－011号;国家自然科学基金项目（49271068）给予部分资助 |
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| ACCUMULATION AND TIME MARKER SIGNIFICANCE OF CHERNOBYL - DERIVED 137Cs IN LAKE SEDIMENTS FROM JIANGSU - ANHUI |
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Xiang Liang, Wang Sumin, Xue Bin
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Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, Nanjing 210008
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| Abstract: |
| The 137Cs from the Chernobyl accident in Pre-Sovit Union is the only widespread source of 137Cs which is not fallout from atomspheric testing of nuclear weapons in natural environment. So it is likely to play an important role as tracer in studying on natural environments. According to the study on the profile distribution patterns of '137Cs in three sediment cores which were collected from Guchenghu Lake, Jiangsu, and Nvshanhu Lake, Anhui, from May, 1991 to Oct., 1992, the characteristics of Chemobyl - derived 137Cs are discussed in this paper. The high peak fallout of Chemobyl - derived 137Cs is similar to that from the atmospheric testing of nuclear weapons during 1963 in this area, so the peak fallout of 137Cs from the Chernobyl accident provides a distinct chronological marker which is a useful tracer in Jiangsu - anhui area for indicating recent sediment record, substantial increase in accumulation rate and local environments respectively. |
| Key words: Chemobyl - derived 137Cs, Lake sediment, Time marker |
