某铀尾矿库周边地下水中镭的分布与成因研究

Research on Distribution and Genesis of Radium in Groundwater around Uranium Tailing Pond

应用基于单因子指数的内梅罗综合评价法研究铀尾矿库周边地下水中^(226)Ra的分布、污染程度及成因。结果表明,研究区地下水单因子污染指数最大值为1.52,最小值为0.65。计算所得的内梅罗综合污染指数为1.34,水质属于基本清洁区,受^(226)Ra污染较轻。^(226)Ra活度的分布总体上是西南部较低,东北部较高。极可能是地下水径流条件影响了^(226)Ra的迁移与富集。此外,铀矿山开采导致大量的镭元素活化释放,进入水体造成镭污染的人为因素以及研究区的水文地质条件、水化学参数及水化学成分等对地下水中^(226)Ra的迁移与富集也有一定影响。

Distribution, pollution level and genesis of 226Ra in groundwater around uranium tailings pond were investigated by synthesized index method based on single factor index. The results show that the maximum and minimum single factor pollution index of groundwater in study area is 1.52 and 0. 65 respectively. The synthesized pollution index is 1.34, demonstrating a light pollution of groundwater in study area. Activity of 226Ra in groundwater is weaker in southwest and stronger in northeast. Migration and enrichment of 226Ra in groundwater may be caused by runoff condition. In addition, human uranium mining activates plenty of 226Ra. 226Ra entering into water, results in pollution of groundwater. Hydrogeology condition, hydrochemistry parameters and water chemical composition of the study area also exert effect on migration and enrichment of 226Ra in groundwater.