秦山核电站正常运行后苏州地区环境介质中放射性水平变化及剂量评价

Variatio of Radioactivity in the Environmental Media and Dose Evaluation in Suzhou City when Qinshan Nuclear Power Station in Normal Operational Condition

目的 监测秦山核电站正常运行期间 (1992～ 2 0 0 1年 )苏州地区环境介质中放射性水平的变化。方法 采用放射化学分析方法对大气、土壤、食品等环境介质中的放射性水平进行监测。结果 环境介质中总放射性水平、13 1Ⅰ和13 4 ,13 7Cs含量均低于国家标准限制浓度 ;成人个体13 4 ,13 7Cs有效剂量值为 4 .4 1× 10 -4mSv/a。结论 苏州地区环境介质中的放射性水平为天然本底水平 ,未受到秦山核电站运行过程中气载放射性流出物的影响。

Objective To study the radioactive mornitoring in evironmental media of Suzhou City when Qingshan Nuclear Power Station was in normal operational condition (from 1992～2001).Methods The radiochemical method was used for monitering the radioactivity level in air,soil and food. Results The total radioactivity,conentrations of 134 I and 134,137 Cs in environmental media was far lower than the limit values specified by the national standard GB. Conclusion The radiaetivity level in Suzhou City is at the natural backgroud level.The individual annual average effective dose for adults in that period caused by ingestion 134,137 Cs in food is 4.41×10 -4 mSv/a.