辽宁徐大堡核电站运行前周边食品放射性水平调查

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²³⁸U、²²⁶Ra、²³²Th、⁴⁰K以及人工核素¹³⁷Cs，其中天然核素²³⁸U、²²⁶Ra、²³²Th、⁴⁰K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）、（9.0×10¹ ±5.8×10¹）Bq/kg，人工核素 ¹³⁷Cs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¹³⁷Cs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¹³⁷Cs所致年有效剂量为6.0×10^?2 μSv/a。

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

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 ²³⁸U, ²²⁶Ra, ²³²Th, ⁴⁰K and the man-made radionuclide of ¹³⁷Cs. The average activity levels of natural ²³⁸U、²²⁶Ra、²³²Th、⁴⁰K 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)、(9.0×10¹ ±5.8×10¹)Bq/kg respectively. The average level of ¹³⁷Cs in food was (1.2×10^-12 ±9.0×10^-13)Bq/kg.Conclusion The man-made radionuclides were not detected except ¹³⁷Cs in the collected food. The radioactivity concentrations were lower than the national standards. The effective dose for local residents by ingestion of ¹³⁷Cs was around 6.0×10^?12 μSv/a.