秦山核电站周围农业生态环境放射性本底调查

本研究调查了秦山核电站站址周围50km半径范围内土壤、水和农作物的总α、总β放射性水平,土壤中天然放射性核素含量,以及γ外照射积累剂量。结果表明:土壤中总α、总β值分别为0.54—1.48×10~(-8)Ci/kg和1.90—2.96×10~(-8) Ci/kg,低于全国一般地区平均水平,且0—100cm土层变化不大。土壤中~238U、~226Ra、~232Th、~40k、~137Cs的放射性活性分别为0.67—5.00×10~(-9)、4.49—11.4×10~(-10)、0.88—1.69×10~(-9)、0.39—2.09×10~(-8)和0.89—4.32×10~(-10)Ci/kg。河水、湖水以及核电站废水排放口处海水总β值分别为1.32—8.62、3.6和2.55×10~(-12)Ci/L。大米和油菜叶中的总β值分别为2.53和3.0×10~(-9)Ci/kg。室内外月平均γ照射量各为10.6—14.7和9.16—13.7mR。

THE RADIOACTIVE BACKGROUND OF AGRICULTURAL ECOLOGICAL SYSTEM AROUND QINSHAN NUCLEAR POWER STATION

The radioactive background of agricaltural ecological system around Qinshan nuclear power station and its changes were surveyed before the station was built, so that the original data are available for monitoring the radioactive changes of the surroundings when normal operation of the station starts.The survey also provides the data for improving the surrounding monitor scheme.The total a and β radioactive level of 238U,226Ra, 232Th, 40K and 137Cs in the soils and accumulation within a radius of 50 km around Qinshan station were monitored.