Global fallout Pu recorded in lacustrine sediments in Lake Hongfeng, SW China

被引：59

作者：

Zheng, Jian ^{[1
]}

Wu, Fengchang ^{[2
]}

Yamada, Masatoshi ^{[1
]}

Liao, Haiqing ^{[2
]}

Liu, Congqiang ^{[2
]}

Wan, Guojiang ^{[2
]}

机构：

[1] Natl Inst Radiol Sci, Environm Radiat Effects Res Grp, Nakaminato Lab Marine Radioecol, Ibaraki 3111202, Japan

[2] Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550002, Peoples R China

来源：

ENVIRONMENTAL POLLUTION | 2008年 / 152卷 / 02期

基金：

中国国家自然科学基金;

关键词：

Pu isotope pollution; SF-ICP-MS; Lake Hongfeng; lacustrine sediments; global fallout;

D O I：

10.1016/j.envpol.2007.06.027

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

Studies on the distribution and isotope compositions of fallout Pu are important for source characterization of possible future non-fallout Pu contamination in aquatic environments, and useful for dating of recent sediments to understand the pollution history of environmental contaminants. We present the historical record of atmospheric Pu fallout reconstructed from a sediment core from Lake Hongfeng, China. The Pu activity profile was in agreement with the Cs-137 profile. Inventories were 50.7 Bq m(-2) for Pu239+240 and 1586 Bq m(-2) for Cs-137. The average Pu-240/Pu-239 atom ratio was 0.185+/-0.009, indicating that Pu originated from global stratospheric fallout rather than from direct tropospheric or close-in fallout from the Chinese nuclear testing conducted in the 1970s. Our data suggested that Lake Hongfeng would be an ideal setting for monitoring atmospheric fallout and environmental changes in this region. (C) 2007 Elsevier Ltd. All rights reserved.

引用

页码：314 / 321

页数：8

共 31 条

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