辽宁徐大堡核电站运行前周边食品放射性水平调查

Investigation on food radioactivity levels in areas around Xudabao nuclear power plant before operation

目的调查辽宁徐大堡核电站运行前周边地区食品放射性本底水平,掌握当地居民主要食品中放射性核素水平。方法通过采集核电站周边30 km范围的食品样品,采用高纯锗(HPGe)能谱仪对样品进行γ核素分析。结果当地食品中的放射性核素主要为天然核素^(238)U、^(226)Ra、^(232)Th 、^(40)K以及人工核素^(137)Cs,其中天然核素^(238)U、^(226)Ra、^(232)Th 、^(40)K的平均活度水平为(1.2×10^(-1)±2.6×10^(-1))、(9.2×10^(-2)±1.6×10^(-1))、(3.6×10^(-1)±6.5×10^(-2))、(9.0×10^(1)±5.8×10^(1))Bq/kg,人工核素^(137)Cs平均活度水平(1.2×10^(-2)±9.0×10^(-3))Bq/kg。结论核电站周边地区采集的食品中除微量^(137)Cs外,未发现其他人工γ核素,食品中放射性核素水平均低于国家标准限值,居民由食入^(137)Cs所致年有效剂量为6.0×10^(-2)μSv/a。

Objective To investigate the food radioactivity levels in areas around the Xudabao nuclear plant before operation.Methods The food radioactivity levels were achieved by detecting samples collected within 30 km around the Xudabao nuclear power plant with a HPGe detector.Results The major radionuclides in food were ^(238)U,^(226)Ra,^(232)Th ,^(40)K and the man-made radionuclide of ^(137)Cs.The average activity levels of natural ^(238)U、^(226)Ra、^(232)Th 、^(40)K were(1.2×10^(-11)±2.6×10^(-11))、(9.2×10^(-12)±1.6×10^(-11))、(3.6×10^(-11)±6.5×10^(-12))、(9.0×10^(1)±5.8×10^(1))Bq/kg respectively.The average level of^(137)Cs in food was(1.2×10^(-12)±9.0×10^(-13))Bq/kg.Conclusion The man-made radionuclides were not detected except ^(137)Cs in the collected food.The radioactivity concentrations were lower than the national standards.The effective dose for local residents by ingestion of ^(137)Cs was around 6.0×10^(-12)μSv/a.