湘江衡阳段天然放射性核素水平调查

Investigation of natural occurring radionuclides in Xiangjiang river of Hengyang section

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、^(226)Ra、^(40)K、^(210)Po、^(210)Pb 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^(226)Ra、^(210)Po、^(210)Pb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。

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.