Quantitative assessment of the spatial distribution of 239+240Pu inventory derived from global fallout in soils from Asia and Europe

• 作者: CAO Liguo ZHOU Zhengchao WANG Ning XIAO Shun
• 来源期刊: 地理学报（英文版）
• 年，卷（期）: 2022,（4）
• 所属期刊栏目: Research Articles
• 页码范围: 605-616
• 页数: 12页
• 语种: 英文
• DOI: 10.1007/s11442-022-1963-z

摘要

Due to the atmospheric nuclear weapon tests carried out,terrestrial environments have been extensively contaminated by global fallout of plutonium(Pu)worldwide.The 249+240Pu inventories in soil profiles from undisturbed and flat forest or grasslands(reference sites)mainly from Europe and Asia are considered as important background for evaluating soil erosion.Thus,we conducted a literature survey over an area extending from 2.6°W to 148.9°E and from 53.2°S to 76.6°N,with the purpose of analyzing the spatial distribution of 239+240Pu inventories and possible controlling factors.The aim of this work was to derive an empirical model of 239+240Pu inventory based on currently available 239+240Pu data,precipita-tion and latitude.The results show that,in general,the latitudinal distribution of 239+240Pu inventory was consistent with the UNSCEAR reports.However,the 239+240Pu inventories are higher than the UNSCEAR data,especially in the Northern Hemisphere.In addition,close relationships(at the 0.01 significance level)were identified between 239+240Pu inventories and annual precipitation and latitude.An empirical formula was therefore developed to estimate 239+240Pu inventories in soils based on latitude and precipitation data.However,future re-search may require more data of measured 239+240Pu inventories in soil profiles that can be used to compare,validate and improve upon the accuracy of the inferred empirical equation.