Source of 239+240Pu in the environment of Northwest China and its causes
HUANG Ya-nan1, WU Meng-meng2, XIAO Zhi3
1. School of Marine Science, Sun Yat-sen University, Zhuhai 519082, China; 2. School of Geographic and Oceanographic Sciences, Nanjing University, Nanjing 210023, China; 3. School of Natural Resource and surveying, Nanning Normal University, Nanning 530001, China
Abstract：This study was taken 239+240Pu as an example, the five major trends of environmental investigation after the global atmospheric nuclear weapon tests were summarized. Meanwhile, the 239+240Pu activities, 240Pu/239Pu atom ratios and 239+240Pu inventories in the environment of Northwest China were comprehensively analyzed.The results showed that 240Pu/239Pu atom ratios in soils from Xinjiang, Gansu, Qinghai, Ningxia and Shaanxi were mainly derived from global fallout. Although the former Soviet Union Semipalatinsk nuclear tests, China Lop Nor nuclear tests and Qinghai Atomic City nuclear testing activities may produce the relatively low 240Pu/239Pu atom ratio, the area of influence was limited.This study not only found the significant change of 240Pu/239Pu atom ratios in soils, but also found it in lake sediments.Two vertical distribution patterns of catastrophes and gradients on 240Pu/239Pu atom ratios were found in lake sediment cores in Northwest China. In addition, the location of239+240Pu activity in some sediment core could not indicated the 1963peak age of global fallout.
黄亚楠, 吴孟孟, 肖智. 中国西北地区环境中239+240Pu的来源与成因分析[J]. 中国环境科学, 2021, 41(11): 5334-5344.
HUANG Ya-nan, WU Meng-meng, XIAO Zhi. Source of 239+240Pu in the environment of Northwest China and its causes. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(11): 5334-5344.
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