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目的了解三门湾宁波区域核电站运行前环境辐射水平和环境介质放射性水平,建立环境本底分布基线资料。方法通过现场监测和实验室检测获取核电站宁波区域30 km范围内环境γ外照射剂量率和生物介质(水源水、农产品、水产品和晨尿)的放射性水平基线数据。结果原野环境γ外照射剂量率的平均值为86.47 n Gy/h±5.25 n Gy/h,距核电站10 km监测区域环境γ外照射剂量率低于10 km以上的区域。不同季节原野γ外照射剂量率比较差异无统计学意义(P>0.05)。居民晨尿中放射性核素3H和137Cs监测值分别为1.716 Bq/L±0.654 Bq/L和1.037 Bq/L±0.038 Bq/L,农产品检出值均远小于国家标准中对食品中放射性物质的限值要求,水源水样品总放射性指标符合国家饮用水标准。结论建立监测区域核电站运行前放射性本底背景值,为核电站运行后三门湾宁波区域的长期监测和数据比对提供参考。
Objective To understand the environmental radiation and radioactive levels before operation in Sanmen Bay Ningbo nuclear power station and establish the baseline data of environmental background distribution. Methods Based on field monitoring and laboratory tests, the ambient γ radiation dose rate and the baseline radioactivity level of biological media (source water, agricultural products, aquatic products and morning urine) within 30 km of nuclear power station in Ningbo were obtained. Results The average γ radiation dose rate of wilderness environment was 86.47 n Gy / h ± 5.25 n Gy / h, which was less than 10 km above the ambient γ dose rate of 10 km from the nuclear power station. There was no significant difference in the dose rate of γ outside field in different seasons (P> 0.05). The values of 3H and 137Cs in morning urine of residents were 1.716 Bq / L ± 0.654 Bq / L and 1.037 Bq / L ± 0.038 Bq / L, respectively. The detection values of agricultural products were far less than those of national standards for radioactive substances in food Limit requirements, water samples total radioactivity indicators in line with national drinking water standards. Conclusions The establishment of the background radioactive background value before the operation of the nuclear power station in the monitoring area provides a reference for the long-term monitoring and data comparison of the Sanmen Bay in Ningbo after the nuclear power station operation.