Atmospheric transport of <137>Cs associated with spring dust event in East Asia
(0) No further contamination by <137>Cs has been registered after the cessation of atmospheric nuclear testing in 1980 and the Chernobyl nuclear reactor accident in 1986. Therefore, atmospheric concentrations of <137>Cs were expected to have declined in recent years. However, deposition of <137>Cs in Japan from the late 1990s to the early 2000s does not show an obvious decreasing trend. Specifically, considerable deposition of <137>Cs was observed in March 2002. At this time, there was a severe sandstorm on the East Asian continent, and the soil dust raised by the storm was transported across the sea to Japan. Our radioactivity measurements showed <137>Cs enrichment in the surface layer of grassland soils in the area of the storm, which we attributed to accumulation as a result of past nuclear testing. We suggest that the grassland is a potential source of <137>Cs-bearing soil dust.
<137>Cs radionuclide Asian dust
H. Fujiwara Y. Shirato T. Ohkuro T. Zhang
Soil Environment Division, National Institute for Agro-Environmental Sciences, 3-1-3 Kannondai, Tsuk Agriculture, Forestry and Fisheries Research Council, 1-2-1 Kasumigaseki, Chiyoda-ku, Tokyo 100-8950 University of Tokyo, 1-1-1 Yayoi, Bunkyou-ku, Tokyo 113-8657, Japan Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences,
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
394-395
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）