Jozef Stefan Institute, Jamova 39, SI-1000 Ljubljana, Slovenia.
J Environ Radioact. 2010 Jan;101(1):22-8. doi: 10.1016/j.jenvrad.2009.08.006. Epub 2009 Sep 16.
As a result of former uranium mining and milling activities at Zirovski vrh, Slovenia, 0.6 million tons of uranium mill tailings (UMT) were deposited onto a nearby waste pile Borst. Resulting enhanced levels of natural radionuclides in UMT could pose threat for the surrounding environment. Therefore, sequential extraction protocol was performed to assess mobility and bioavailability of (238)U, (234)U, (230)Th and (226)Ra in soils from the waste pile and its surrounding. The radionuclides associated with exchangeable, organic, carbonate, Fe/Mn oxides and residual fraction, respectively, were determined. Results showed that the highest activity concentrations for the studied radionuclides were on the bottom of the waste pile. In non-contaminated locations, about 80% of all radionuclides were in the residual fraction. Considering activity concentrations in the UMT, (238)U and (234)U are the most mobile. Mobility of (226)Ra is suppressed by high sulphate concentrations and is similar to mobility of (230)Th.
由于斯洛文尼亚 Zirovski vrh 的铀矿开采和选矿活动，060 万吨铀尾矿（UMT）被堆放在附近的 Borst 废物堆上。UMT 中天然放射性核素水平的增加可能对周围环境构成威胁。因此，采用顺序提取方案来评估废物堆及其周围土壤中（238）U、（234）U、（230）Th 和（226）Ra 的迁移性和生物可利用性。分别确定了与可交换、有机、碳酸盐、Fe/Mn 氧化物和残余部分相关的放射性核素。结果表明，在所研究的放射性核素中，活性浓度最高的是废物堆的底部。在未受污染的地点，约 80%的所有放射性核素都在残余部分。考虑到 UMT 中的活性浓度，（238）U 和（234）U 是最具迁移性的。高硫酸盐浓度抑制了（226）Ra 的迁移性，使其与（230）Th 的迁移性相似。
