Journal Article Plutonium concentration and 240Pu/239Pu isotopic ratio in the surface soils from the Jiuquan region in northwestern China

Bu, Wenting  ,  Zheng, Jian  ,  Guo, Qiuju  ,  Uchida, Shigeo

Surface soil samples collected in the Jiuquan region in the downwind area of the Chinese nuclear test site (CNTs) in northwestern China were analyzed for Pu isotopes. The 239+240Pu activities ranged from 0.025 to 0.892 mBq g-1, varying significantly with different sampling sites. The Dunhuang city which located in the southwestern part of the Jiuquan region received the heaviest Pu deposition. The 240Pu/239Pu atom ratios were 0.080-0.193 with an average of 0.167, slightly lower than the global fallout value. The results further convinced the influence of the CNTs for the Pu contamination in the Jiuquan region.

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