阳江核电站邻近海域的总α、总β放射性比活度水平

Radioactivities of gross α and β in adjacent sea area of Yangjiang Nuclear Power Plant

采用共沉淀法分析测定了阳江核电站邻近海域2012—2013年海水样品总α、总β的放射性比活度、表层沉积物样品中总β的放射性比活度以及2013年生物样品中总β的放射性比活度。结果表明:2012—2013年两年间阳江核电站邻近海域海水中总α的放射性比活度范围为:0.083~0.205 Bq/L,平均值为0.134 Bq/L;总β的放射性比活度范围为:0.029~0.059 Bq/L,平均值为0.043 Bq/L。与渤海、黄海、东海、珠江口等其他海域相比,阳江核电邻近海域总α、总β放射性比活度水平相对较低。2012—2013年阳江核电站邻近海域表层沉积物中总β的放射性比活度范围为:620~1125 Bq/kg(干重),平均值为814 Bq/kg(干重)。与渤海、黄海、东海、珠江口等各海域沉积物相比,研究海域沉积物中总β的放射性比活度位于中等水平。2013年阳江核电站邻近海域生物样品总β的放射性比活度范围为:16.1~74.7 Bq/kg,平均值为39.4 Bq/kg,其中鱼类的总β平均值为64.6 Bq/kg,虾类的总β平均值为36.8 Bq/kg,贝类的总β平均值为16.7 Bq/kg,呈现鱼类>虾类>贝类的分布趋势。

Gross α and gross β in seawater,sediments and organism samples collected in 2012 and 2013 from the adjacent sea area of Yangjiang Nuclear Power Plant were measured by co-precipitation method.The results showed that in 2012 and 2013 gross α in seawater averaged 0.134(0.083-0.205)Bq/L.Gross β in seawater averaged 0.043(0.029-0.059)Bq/L.The gross α and gross β levels were lower compared with those from other sea areas.In 2012 and 2013 gross β in surface sediments was 814(620-1125)Bq/kg in average.The gross β level was at middle level compared with those from other sea areas.In 2013 gross β in marine organisms averaged 39.4(16.1-74.7)Bq/kg.The averages of gross β in fishes,shrimps and shellfishes were 64.6,36.8 and 16.7 Bq/kg,respectively.