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中文摘要：
研究临水河河水中放射性核素铀、钍含量的分布特征,对河水进行污染评价并估算其放射性核素所致居民剂量。结果表明,河水中铀、钍核素浓度分别在1.1-8.2、0.5-8.18μg/L范围内,距离铀矿田越近的采样点铀、钍含量越高,总体上,河水中铀、钍含量沿程呈递减趋势。采用处于铀矿田上游且距离铀矿田较远的1号采样点作为背景值,通过内梅罗污染指数法对研究区河水进行污染评价,发现临水段均受到不同程度的放射性污染,污染指数最高为10.37,属严重污染。饮水摄入的放射性核素铀、钍浓度所致居民剂量最大值为8.84×10^-6Sv,低于WHO推荐的指导水平,暂时对人体健康没有危害或危害较轻。由于核素的迁移与累积特性,建议对该河水仍需持续监测与研究。
英文摘要：
Distribution characteristics of radionuclides（U,Th）in Linshui River were studied.Pollution of water was evaluated to calculate internal dose level of radionuclides of residents.The results show that ranges of radionuclides concentrations are 1.1-8.2μg/L for uranium and 0.5-8.18μg/L for thorium.Contents of U and Th rise when sampled closer to sampling site of uranium ore.Overall,contents of U and Th in river trend to drop along the way.Comprehensive evaluation of radionuclides（U,Th）in river,performed by Nemerow＇s Pollution Index（NPI）as against background values of sampling sites NO.1locating in upstream of uranium district,indicates that the river is subjected to different levels of radioactive contamination with the highest level of NPI reaching 10.37 as hazardous level.Radionuclides（U,Th）lead to the maximal effective dose of 8.84×10^-6 Sv,lower than the recommended level of WHO,suggest that radionuclides in the river are of no or a little harm for human health for now.Monitoring and research on the river water are recommended to continue with migration and accumulation of radionuclides into consideratioin.
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