天津市集中式饮用水水源放射性水平调查研究

Investigation and study on radioactivity level of centralized drinking water sources in Tianjin

对天津市9个集中式饮用水水源地保护区和1个纳入国家饮用水源地监测范围的饮用水水源进行放射性水平调查研究,在枯水期、丰水期进行采样并对所有水样的总α、总β、U、Th、226Ra项目进行监测分析和评价。研究结果表明,天津市6个地表水饮用水源及4个地下水饮用水源的总α、总β活度浓度水平均低于《生活饮用水卫生标准》(GB5749—2006)中规定的放射性总α≤0.5Bq/L和总β≤1Bq/L的放射性指标指导值,天然放射性核素U、Th、226Ra均处于本底水平,天津市集中式饮用水水源放射性处于正常水平,城市集中式饮用水源地辐射环境质量良好。

To investigate and study the radioactivity level of 9 centralized drinking water source protection areas and 1 drinking water source which is included in the monitoring scope of national drinking water source in Tianjin,samples were taken in high and low water period,and the total α,total β,U,Th and 226 Ra of all water samples were monitored,analyzed and evaluated.Results show that the total α,total β activity levels of 6 surface drinking water sources and 4 ground drinking water sources are lower than the limits specified in the Standards For Drinking Water Quality,and the activity of natural radioactive nuclides such as U,Th and 226 Ra are in background level,the radioactivity of the centralized drinking water sources in Tianjin is at normal level,the radiation environment of the urban centralized drinking water sources is of good quality.