Distribution of artificial radionuclides in lacustrine sediments in China.
Distribution of artificial radionuclides in lacustrine sediments in China.
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DOI：
10.1093/rpd/ncr173
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发表时间：
2011-07
影响因子：
1
通讯作者：
Fengchang Wu;Jian Zheng;Hai-qing Liao;M. Yamada
中科院分区：
文献类型：
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作者：
Fengchang Wu;Jian Zheng;Hai-qing Liao;M. Yamada
由于人造放射性核素具有潜在的毒性，对环境中人造放射性核素的分布、库存和来源建立准确的历史记录对于环境监测和辐射卫生保护十分重要，还有助于查明和评估未来核武器试验和核燃料后处理设施或核动力反应堆意外释放的放射性核素未来可能产生的环境投入。利用扇形场电感耦合等离子体质谱仪研究了中国11个湖泊中钚同位素的近期沉积特征。用常规的放射性分析方法研究了~(137)Cs的分布。根据钚的同位素组成和(137)Cs/(239+240)Pu的活度比，确定了人工放射性核素的来源。讨论了钚同位素在沉积物测年以及区域和全球环境变化研究中的潜在应用。
Establishing accurate historical records of the distribution, inventory and source of artificial radionuclides in the environment is important for environmental monitoring and radiological health protection due to their potential toxicity, and is also useful for identification and risk assessment of possible future environmental inputs of radionuclides from nuclear weapons tests and accidental release from the nuclear fuel reprocessing facilities or nuclear power reactors. A sector-field inductively coupled plasma mass spectrometer was used to study the recent sedimentation of Pu isotopes in 11 lakes in China. The distribution of (137)Cs was investigated using the conventional radiometric analytical methods. Based on the isotopic compositions of Pu and the activity ratio of (137)Cs/(239+240)Pu, the sources of artificial radionuclides were identified. The potential applications of Pu isotopes for sediment dating and for regional and global environmental change studies were discussed.