【摘要】 为了掌握湘江衡阳段天然放射性核素水平及来源,分别于枯水期（11—12月）、丰水期（4—6月）,对湘江衡阳段和该段4条主要支流（舂陵水、蒸水、耒水、洣水）水中的U、Th、²²⁶Ra、⁴⁰K、²¹⁰Po、²¹⁰Pb 6种天然放射性元素/核素进行了调查。测量结果表明:与长江水系及洞庭湖水系历年放射性水平均值相比,湘江衡阳段6种天然放射性核素中²²⁶Ra、²¹⁰Po、²¹⁰Pb明显偏高,说明湘江衡阳段的确受到了放射性污染。4条支流中,舂陵水及蒸水放射性核素浓度异常,明显高于汇入前后的湘江水体的放射性活度浓度。因此,这两条支流区域可能存在放射性污染源头,应对这两条支流区域进行更深入的取样调查,找出其污染源。更多还原

【Abstract】 The activity concentrations of six naturally occurring radionuclides( U,Th,²²⁶ Ra,⁴⁰ K,²¹⁰Po,²¹⁰ Pb)were investigated in four major tributaries in the Hengyang section of the Xiangjiang river（ Chong Ling river,Zheng river,Lei river,Mi river） after sampling in dry season（ November—December） and abundant season（ April—June） in order to find out the level and source of naturally occurring radionulides. The results showed that the concentrations of ²²⁶ Ra,²¹⁰ Po and ²¹⁰ Pb in the Xiangjiang river（ Hengyang section） were significantly higher than average level of the Yangtze River system and the Dongting Lake system. The concentrations of radionuclides in the Chongling and the Zhengshui river were abnormal and significantly higher than those for the other two tributaries and the mean values of the Yangtze River system and the Dongting Lake system over the years. Thus,radioactive pollution sources might exist adjacent to these two tributaries,and further work need to be conducted.更多还原