南宁地区饮用水源中的总放射性水平及剂量估算

目的 调查南宁地区饮用水源中总α、总β活度浓度，收集环境本底数据，保障饮用水安全和公众健康。方法 采用LB 4200型低本底α/β计数器测定调查南宁地区饮用水源中总α和总β放射性，并根据监测结果进行剂量估算。结果 南宁地区饮用水源中总α活度浓度平均值为0.017 Bq/L （<0.008~0.038 Bq/L），总β活度浓度平均值为0.061 Bq/L （0.012~0.130 Bq/L），均低于《生活饮用水卫生标准》（GB 5749—2006）中的放射性指标指导值；通过估算，饮用水致居民受到的总α内照射年有效剂量为2.09~9.93 μSv/a，总β内照射年有效剂量为0.044~0.476 μSv/a，均低于WHO的推荐参考水平。结论 南宁地区饮用水源中的总α和总β放射性水平处于环境正常本底范围，不会对人体健康造成影响。

Gross radioactivity level and does estimation for drinking water sources in Nanning,China

Objective To investigate the gross α and β activity concentrations in drinking water sources of Nanning, and accumulate the environmental background to ensure drinking water safety and public health. Methods The activity concentrations of gross α and β were measured using the low background α/β counter (LB4200), and the results were used for dose estimation. Results The mean concentrations of gross α and β were 0.017Bq/L (<0.008~0.038 Bq/L) and 0.061Bq/L (0.012~0.130 Bq/L), respectively. Both of them were below the national limits set by GB 5749-2006. The annual effective doses were estimated to be 2.09~9.93 μSv and 0.044~0.476 μSv for the gross α and β activities respectively, and they were also below the WHO recommended reference level for all water samples. Conclusion The radioactivity level in drinking water sources of Nanning is within the normal background range and will not pose a threat to the public health.