铀在固体介质中的扩散行为研究

Investigation on migration of Uranium in solidified materials

研究了放射性核素铀在土壤和水泥中的迁移扩散行为,以及某已关闭放射性分析实验室厂房附近地表土和水泥地面污染情况。采用柱迁移实验研究了核素铀在土壤和水泥样品的柱分配系数Kd和滞留系数Rd。结果表明,铀在土壤中的分配系数大于水泥样品中。环境土壤和水泥样品的比活度测量结果与该地区环境土壤本底值基本一致,随着样品取样深度的增加U-235的比活度测量结果变化不明显。

The sorption and migration behaviors of uranium in soils and cement were studied by column test. The results show that the sorption ratio of soil is bigger than that of cement. Specific radioactivity of 235U in the soil and cement samples is basically the same as that of environmental soil, and specific radioactivity of 235U varies little with the sampling depth. The results should provide valuable information to nuclear facility decommissioning.