The surface soil samples with a set of 0-5cm and 5-20 cm depth were collected from Beijing,Taiyuan, Shijiazhuang, and Jinan of China in early 1990. The samples were analyzed for239,240 Pu, 241Am and 137Cs.
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- 分别从北京、太原、石家庄和济南地区采集了深度为0-5和5-20cm的土壤样品；进行了~(239；240)pu、~(241)Am、~(137)Cs、~(40)K以及天然铀、钍系放射性核素的测定.
