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239+240Pu作为湖泊沉积物计年时标:以云南程海为例
万国江; 吴丰昌; 万恩源; 廖海清; Y Masatoshi; 王长生
2011
Source Publication环境科学学报
Volume31Issue:5Pages:979-986
Other Abstract在近代沉积作用领域137Cs时标与210Pb计年结合,获得了广泛而有效的应用.然而,137Cs经过两个半衰期的衰变已难于辩识.环境中的Pu核素具有相对较长的半衰期,也随全球大气扩散而散落于地球表面,可望作为沉积计年的时间标志.通过程海沉积物柱芯中239+240Pu比活度、240Pu/239Pu原子比率及校正到沉积年代的137Cs比活度的对比研究表明:二者比活度的垂直剖面基本相似、239+240Pu比活度与北半球137Cs逐年沉降量之间也具有很好的对应关系,显示出239+240Pu同样具有湖泊沉积计年的时标价值.不同层节沉积物中,239+240Pu/137Cs的平均值为0.016;∑239+240Pu/∑137Cs=0.012,与全球大气散落沉降的活度比相近.239+240Pu/137Cs活度比的垂直变化,寓意出239+240Pu在沉积物中较137Cs具有更小的扩散迁移能力.240Pu/239Pu原子比率平均值为0.195±0.021,显示240+239Pu主要来自全球大气散落沉降;沉积物8cm深度出现的异常点,显示出切尔诺贝利核事故影响的痕迹. 
Keyword239+240pu 240pu/239pu 137cs 湖泊沉积计年时标 程海
Subject Area环境地球化学
Indexed ByCSCD
Language中文
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Document Type期刊论文
Identifierhttp://ir.gyig.ac.cn/handle/352002/7053
Collection环境地球化学国家重点实验室_环境地球化学国家重点实验室_期刊论文
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GB/T 7714
万国江,吴丰昌,万恩源,等. 239+240Pu作为湖泊沉积物计年时标:以云南程海为例[J]. 环境科学学报,2011,31(5):979-986.
APA 万国江,吴丰昌,万恩源,廖海清,Y Masatoshi,&王长生.(2011).239+240Pu作为湖泊沉积物计年时标:以云南程海为例.环境科学学报,31(5),979-986.
MLA 万国江,et al."239+240Pu作为湖泊沉积物计年时标:以云南程海为例".环境科学学报 31.5(2011):979-986.
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