秦山核电基地氚排放所致周围公众内照射剂量评价

统计了2014—2016年秦山核电基地周围居民点环境介质中的氚活度浓度监测结果,基于统计的环境监测数据评价了秦山核电基地近几年氚排放所致周围公众的辐射剂量。评价结果显示近几年秦山核电基地氚排放所致西北西方位2.4 km处的秦联居民组婴儿、幼儿、少年和成人4个年龄组公众的年平均有效剂量分别为0.59、1.35、1.18和0.92 μSv/a,远小于《核动力厂环境辐射防护规定》(GB 6249—2011)中规定的核动力堆释放的放射性物质对公众造成的有效剂量0.25 mSv/a的管理目标值。可见,秦山核电基地氚排放稳定、受控,对公众造成的辐射剂量很小,对环境和公众的影响可接受。

Assessment of internal dose from tritiumof Qinshan Nuclear Power Base

The monitoring results of tritium concentration in the surrounding residential areas of Qinshan Nuclear Power Base from 2014 to 2016 were analyzed.Based on the statistical environmental monitoring data,the radiation dose of the surrounding public caused by tritium emission in recent yeas in Qinshan Nuclear Power Base was evaluated.Evaluation results show that the average internal dose caused by tritium emission of Qinlian residents groups of infants,young children,teenagers and adults were 0.59,1.35,1.18 and 0.92 μSv/a respectively,which is far less than the prescribed effective dose of 0.25 mSv/a caused by radioactive effluent of nuclear power reactor release,which was stipulated by《Regulations for environmental radiation protection of nuclear power plant》(GB 6249—2011).Qinlian residential area is located 2.4 km from WNW azimuth of the Qinshan Nuclear Power Base.It can be seen that the tritium emission in Qinshan Nuclear Power Base is stable and controlled,and the environmental and public impact is acceptable.