【摘要】 目的调查2011-2017年北京市地表水和生活饮用水中的放射性水平及分布特点,以便更好开展北京市地表水和生活饮用水放射卫生监测和评价工作。方法抽查北京市16个行政区共551件地表水和生活饮用水样品,其中地表水287件,生活饮用水264件,使用BH1217B双路弱α、β测量仪测量水中的总α和总β放射性。结果 2011-2017年北京市地表水总α、总β放射性活度的平均值分别为0. 082和0. 230 Bq/L,生活饮用水总α、总β放射性活度平均值分别为0. 090和0. 090 Bq/L;地表水与生活饮用水比较,生活饮用水总α放射性水平较高(P <0. 05),地表水总β放射性水平较高(P <0. 05)。地表水总α放射性水平,生活饮用水总α、总β放射性水平在2011-2017年分布差异有统计学意义(P值均小于0. 05),地表水总β放射性水平在2011-2017年分布差异无统计学意义(P> 0. 05)。结论北京市地表水和生活饮用水中放射性水平处于正常本底值。更多还原

【Abstract】 Objective To investigate the radioactivity level and its distribution in surface water and drinking water in Beijing from 2011 to 2017 for better launching the program of monitoring and assessment of water. Methods 551 water samples including 287 surface water and 264 drinking water were collected from 16 districts. The gross α,gross β of these samples were measured by using the BH1217 B dual-channel low α/β measuring instrument. Results The gross α,gross β of surface water and drinking water in Beijing from 2011 to 2017 were averaged to be 0. 082,0. 230,0. 090 and 0. 090 Bq/L,respectively.The level of gross α in drinking water was higher than that in surface water. The level of gross β in surface water was higher than that in drinking water. The difference of gross α activity from 2011 to 2017 in surface water was statistically significant.The difference of gross β activity from 2011 to 2017 in surface water was not statistically significant. The difference of gross αand gross β activity from 2011 to 2017 in drinking water were statistically significant respectively. Conclusion The radioactivity level in surface water and drinking water in Beijing from 2011 to 2017 are in a normal background level.更多还原