阳江核电厂外围环境气溶胶总α、总β放射性水平

Total α and total β radioactivity level in atmospheric aerosol around Yangjiang nuclear power plant

核电厂周围环境气溶胶的总放射性水平是一项重点关注项目。为掌握阳江核电周围环境气溶胶中总α、总β放射性水平及变化趋势,自2014年1月,对阳江核电厂5 km范围内大澳和允泊的气溶胶总α、总β进行为期三年的采样监测,获得该核电厂5 km范围内气溶胶总α、总β活度浓度范围分别为0.01-0.35 m Bq·m^(-3)、0.05-2.46 m Bq·m^(-3),年均值分别为0.07 m Bq·m^(-3)、0.65 m Bq·m^(-3)。受降雨影响,总α、总β放射性变化有明显的季节特征,总体呈现冬春季高、夏秋季低的特点。监测结果与对照点和本底调查进行比较,总α、总β活度浓度没有明显变化,初步判断阳江核电厂运行安全。

Background： As an important content of radiation environmental monitoring in nuclear power plant, the atmospheric aerosol radioactive level has attracted much attention. Purpose： This study aims to find out variation regularity and affecting factors of total α and total β in atmospheric aerosol 5 km around the Yangjiang nuclear power plant. Methods： Radioactivity concentrations of total α and total β in the atmosphere aerosol of Daao village and Yunbo village monitoring stations were collected by a large flowrate data sampling instrument using particle trapping cellulose filter paper with more than 95% high efficiency, and measured using low background α/β measuring device in the date range from January 2014 to December 2016. Results： The concentration ranges of total α and total β were 0.01-0.35 mBq·m^-3 and 0.05-2.46 mBq·m^-3 respectively. The annual average concentrations were 0.07 mBq·m^-3 and 0.65 mBq·m^-3. The radioactivity concentrations of total α and total β reflected obvious seasonal variation-all of the maximum monitoring data occurred in the winter due to the influence of the rainfall. Conclusion： Results indicate that there is no significant change of total a and total β in the atmosphere aerosol samples and the operation of the Yangjiang nuclear power plant is safe.