【摘要】 用碱溶液吸收法分析了2002—2009年秦山核电基地外围空气和2007—2009年各种环境介质中14C活度浓度及其历年变化趋势。结果表明:历年来空气中14C活度浓度年平均值范围为38.3 mBq/m3~55.4 mBq/m3。夏家湾、杨柳村空气中14C活度浓度比杭州对照点空气中14C活度浓度略高,但总体保持在同一水平。2004、2005年夏家湾、杨柳村空气中14C活度浓度相对较高,最高值出现在2005年夏家湾采样点,为55.4 mBq/m3。同样,2004、2005年秦山重水堆的14C年气载排放值亦比其他年份高,说明秦山核电基地外围环境空气中14C的活度浓度与源项排放有一定的相关性。夏家湾和杨柳村大米和叶菜中14C活度浓度与杭州对照点相比略有增高,但总体保持在同一水平。核电基地周围海域的水生生物(鲻鱼)中14C活度浓度与舟山对照点处于同一水平。更多还原

【Abstract】 By using the method of alkaline solution absorption,the activity concentrations of Carbon14 as well as its variation tendency in air and biological samples were analyzed.The air samples and biological samples were collected around the Qinshan nuclear power plant base(Qinshan NPP Base) in 2002 to 2009 and 2007 to 2009 respectively.The results showed that,since 2002,the annual average activity concentrations of Carbon-14 in air samples were in the range of 38.3 mBq/m3 to 55.4 mBq/m3.Although the monitoring results of Xiajiawan village and Yangliucun village were comparatively higher than the reference site in Hangzhou City,the results were still at the same level.Meanwhile,monitoring results of Xiajiawan village and Yangliucun village in the summer of 2004 and 2005 are relatively high,with the peak value of 55.4 mBq/m3 appeared in Xiajiawan village during the summer of 2005.Correspondingly the annual airborne Carbon-14 of 2004 and 2005 discharged from the Qinshan NPP 3rd Phase were higher than normal as well,it can therefore be concluded that the activity concentration of Carbon-14 around the Qinshan NPP Base are related to the discharged source term.The activity concentration of Carbon-14 in rice and leaf vegetable samples from Xiajiawan village and Yangliucun village were slightly higher,but within the same level,than that of Hangzhou.The activity concentration of Carbon-14 in the mullet samples collected from the sea area around Qinshan NPP Base are approximately the same with the sea area of Zhoushan.更多还原