Le Thi-Hong-Hanh, Michel Hervé, Champion Julie
Institut de Chimie de Nice (ICN), Université Nice Sophia-Antipolis, 28 Avenue Valrose, 06108, Nice Cedex 2, France.
Institut de Chimie de Nice (ICN), Université Nice Sophia-Antipolis, 28 Avenue Valrose, 06108, Nice Cedex 2, France.
J Environ Radioact. 2019 Apr;199-200:1-6. doi: 10.1016/j.jenvrad.2018.12.027. Epub 2019 Jan 9.
Former uranium mining activities have led to the presence of naturally occurring nuclides embedded in soil. Such activities have also modified the secular equilibrium between radionuclides in U decay series. The objective of this paper is to quantify the long-term effect of former uranium mining activities on the behavior of the final radionuclide in the U-series, i.e. polonium-210 (Po), present in soils. Soil samples are extracted from two uranium sites in France, specifically a quarried site and a natural site. The polonium distribution is studied within the various soil fractions, namely: water soluble, exchangeable, bound to carbonates, bound to iron/manganese oxides, bound to organic matter, and residual. Po is mainly found in the residual fraction of both study sites (87-90%), followed by the carbonates fraction (5-9%). The Po activity in the other fractions is very small in comparison with total activity.
以前的铀矿开采活动导致土壤中存在天然存在的核素。此类活动还改变了铀衰变系列中放射性核素之间的长期平衡。本文的目的是量化以前的铀矿开采活动对土壤中铀系列最终放射性核素即钋 - 210（Po）行为的长期影响。土壤样本取自法国的两个铀矿场地，具体为一个采石场场地和一个天然场地。研究了钋在各种土壤组分中的分布，即：水溶性、可交换性、与碳酸盐结合、与铁/锰氧化物结合、与有机物结合以及残余物。在两个研究场地中，钋主要存在于残余组分中（87 - 90%），其次是碳酸盐组分（5 - 9%）。与总活度相比，其他组分中的钋活度非常小。
