2017—2018年北京市集中式饮用水水源放射性水平调查

Investigation of radioactivity levels of centralized drinking water sources in Beijing from 2017 to 2018

目的调查2017—2018年北京市集中式饮用水水源放射性水平以便更好开展北京市集中式饮用水水源监测和评价工作。方法选择市级和区级集中式饮用水水源、核设施最近的饮用水水源及桶装水取水水源共17个监测点位,测量水中的总α和总β放射性,根据不同水源类型增测U、Th、226Ra、210Po、210Pb、90Sr、137Cs、3H等。结果2017—2018年北京市集中式饮用水水源放射性水平,总α:0.0280~0.0384 Bq/L,总β:0.0862~0.0932 Bq/L;天然放射性核素检出范围分别为:U:0.99~1.59μg/L,Th:0.128~0.167μg/L,226Ra:4.45~6.21 mBq/L,210Po:1.06~1.20 mBq/L、210Pb:1.66~7.90 mBq/L、90Sr:1.04~2.16 mBq/L、137Cs:(<0.365)mBq/L、3H:(<0.856)Bq/L。结论北京市集中式饮用水水源放射性水平处于正常本底值。

Objective To investigate the radioactivity level of centralized drinking water in Beijing from 2017 to 2018 for better launching the program of monitoring and assessment of centralized drinking water.Methods Total 17 water samples were collected from municipal and district supply samples,the nearest source of drinking water for nuclear facilities and barrelled water supply samples.The grossα,grossβin these samples were measured,and according to different water source types,U、Th、226Ra、210Po、210Pb、90Sr、137Cs、3H were measured additionally.Results The grossαof drinking water in Beijing from 2017 to 2018 was 0.0280~0.0384 Bq/L,the gross β:0.0862~0.0932 Bq/L,U:0.99~1.59μg/L,Th:0.128~0.167μg/L,226Ra:4.45~6.21 mBq/L,210Po:1.06~1.20 mBq/L,210Pb 1.66~7.90 mBq/L,90Sr:1.04~2.16 mBq/L,137Cs:(<0.365)mBq/L,3H:(<0.856)Bq/L.Conclusion The radioactivity levels of centralized drinking water in Beijing from 2017 to 2018 were within the normal background level.