Plutonium concentration and 240Pu/239Pu isotopic ratio in the surface soils from the Jiuquan region in northwestern China |
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| Authors: | Wenting Bu Qiuju Guo Jian Zheng Shigeo Uchida |
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| Affiliation: | 1.Institute of Nuclear Physics and Chemistry,China Academy of Engineering Physics,Mianyang,China;2.State Key Laboratory of Nuclear Physics and Technology, School of Physics,Peking University,Beijing,China;3.Biospheric Assessment for Waste Disposal Team & Fukushima Project Headquarters, National Institute of Radiological Sciences,National Institutes for Quantum and Radiological Science and Technology,Chiba,Japan |
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| Abstract: | ![]()
Surface soil samples collected in the Jiuquan region in the downwind area of the Chinese nuclear test site (CNTs) were analyzed for Pu isotopes. The 239+240Pu activities ranged from 0.025 ± 0.009 to 0.89 ± 0.16 mBq g?1, varying significantly with different sampling sites. The Dunhuang city that is located in the southwestern part of the Jiuquan region received the heaviest Pu deposition (239+240Pu activities, 0.23–0.89 mBq g?1). Most of the 240Pu/239Pu isotopic ratios were similar with that of the global fallout. However, the low values (0.080–0.147) observed in three sampling sites further supported the finding of Pu originated from CNTs in that region. |
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