海南昌江核电站周围环境饮用水放射性本底调查

目的通过开展在建的海南昌江核电站周围环境饮用水放射性监测,建立该核电站周围环境饮用水放射性基线数据库。方法采用饱和厚度相对测量法,总α、总β分别用厚样法、薄样法。结果总α、总β范围分别为(0.0001~0.0944)Bq/L和(0.0140~1.1029)Bq/L,几何均数分别为0.0028 Bq/L和0.0513 Bq/L;地下水总β比地表水高,差别有统计学意义(t=3.319,P0.05);水源水总α、总β略高于出厂水;井水、泉水总α、总β比出厂水高,差别有统计学意义(t=2.146、3.301,P0.05);井水、泉水总β较末梢水高,差别有统计学意义(t=2.861,P0.05);分散式供水总α、总β比集中式高,差别有统计学意义(t=2.355、3.293,P0.05);枯水期总α比丰水期高,差别有统计学意义(t=9.876,P0.05)。结论昌江核电站周围环境大部分饮用水样品总α、总β放射性水平符合国家生活饮用水标准;总α、总β在海南省饮用水正常放射性本底水平内,且与国内其它地区相比处于相对低的水平。

Baseline survey of radiation of drinking water around Changjiang Nuclear Power Station in Hainan

Objective To monitor and establish the radioactivity baseline database of drinking water of Changjiang Nuclear Power Station in Hainan. Methods The data were measured by the saturation thickness relative measuring method, the gross α were used by thickness method, gross β with thin sample method. Results The radioactive level ranges of gross α and gross β were （0.0001~0.0944）Bq/L and （0.0140~1.1029）Bq/L, respectively. The geometric means were 0.0028Bq/L and 0.0513Bq/L. The gross β radioactivity in ground water was higher than the surface water, showing significant difference （t =3.319,P〈0.05）. Gross α and gross β radioactive level of source water was slightly higher than that of factory water ;the radioactivity of gross α and gross β of well water and spring was higher than factory water, demonstrating significant difference （t =2.146,3.301,P〈0.05）. Gross β radioactive of well water and spring was slightly higher than tap water with the statistical significant difference （t =2.861,P〈0.05）. Both gross α and gross β radioaction in decentralized water supply were higher than the centralized water supply , having significance difference （t =2.355,3.293,P〈0.05）. The radioactive level of gross α in the dry season was higher than in the wet season, showing significant difference （t =9.876,P〈0.05）. Conclusion The radiation level of gross α and gross β in most drinking water samples around Changjiang Nuclear Power Station met the national drinking water standard. The radiation level of gross α and gross β in drinking water was within normal level of Hainan provincial radioactive background and was lower than that of the other regions.