中文摘要：

沿粤北某铀尾矿库下游水体采集14个水样和11个表层水系沉积物样品，利用电感耦合等离子体原子发射光谱法（ICP-0Es）和低本底HPGe-y／能谱仪分别测量了水样和沉积物中铀含量。结果表明，沿着水流方向，水体中铀浓度由2．091mg／L降到当地环境本底水平0．002mg／L。流入水库前，水体中铀含量均超过0．05mg／L。排水口附近以及下游水库中表层沉积物样品的铀含量比溪流中段的高，特别是水库沉积物中含铀703．1mg／kg，可能会对水质造成长期影响。

英文摘要：

Distribution of uranium contents in 14 waters and 11 surface deposits from the downstream of a uranium tailing repository was detected directly by ICP-OES and HPGe-y energy spectrometer respectively. Results indicated that U contents in waters ranged from 2.091 to 0.002 mg/L which was the same as the background level along the stream. U contents all exceeded 0.05 mg/L for surface water before flowing into the reservoir. The contents of U in the deposit samples around the outflow and in reservoir were higher than the middle reach, especially the contents of U attained to 703.1 mg/kg in reservoir deposit, which would affect water quality for a long time.