【摘要】 目的对海阳核电站运行前周边地区食品中放射性核素进行分析,获取该地区放射性核素基线值,为评估核电站对人群的影响提供依据。方法采集核电站周围50 km范围内居民日常食用的22种食品样品,进行预处理、测量,采用效率曲线法计算样品中所含放射性核素的活度浓度（Bq/kg）,并估算当地居民由膳食摄入所致的待积有效剂量。结果食品样品中检出的放射性核素为天然核素⁴⁰K、²³⁸U、²³²Th、²²⁶Ra以及人工核素¹³⁷Cs、⁶⁰Co,检出人工核素刚达到探测下限,其余人工核素¹³¹I、¹³⁴Cs、⁵⁸Co未检出;⁴⁰K、²³⁸U、²³²Th、²²⁶Ra、¹³⁷Cs的活度浓度平均值分别为12.858、0.550、0.146、0.077、0.016 Bq/kg,范围分别为0.0266².2736,0.0013¹.3599,0.0127⁰.2568,0.0043⁰.0555,0.0065⁰.0065,2.433³0.4572 Bq/kg;放射性核素平均活度浓度由高到低依次为⁴⁰K>²³⁸U>²³²Th>²²⁶Ra>¹³⁷Cs>⁶⁰Co,各种核素所致年待积有效剂量为39.21μSv/a,其中人工核素为0.03μSv/a。结论所检测海阳核电站周边地区食品中人工核素除微量¹³⁷Cs、⁶⁰Co外,未见其他人工核素;食品中各种放射性核素活度浓度均在国家标准限值以内,对周围居民造成的剂量负担较小。更多还原

【Abstract】 Objective To analyze the radioactivity levels and obtain the baseline value of radionuclide in the food in the area around the Haiyang Nuclear Power Plant,and to provide a basis for assessing the impact of the nuclear power station on the population.Methods To collect 22 kinds of food samples of daily consumption diet around the nuclear power plant in the 50 km area,calculate the activity concentration（ Bq/kg） by using the efficiency curve method,and estimate the committed effective dose of the local population.Results The natural radionuclides ⁴⁰K,²³⁸U,²³²Th,²²⁶Ra and artificial radionuclides ¹³⁷Cs and ⁶⁰Co were detected in food samples.The artificial radionuclides were just above the detectable limit.Other artificial radionuclides just like ¹³¹I、¹³⁴Cs、⁵⁸Co were not detected.The average radioactivity of ⁴⁰K、²³⁸U、²³²Th、²²⁶Ra、¹³⁷Cs were 12.858、0.550、0.146、0.077、0.016 Bq/kg,their range were 0.0266 2.2736,0.0013 1.3599,0.0127 0.2568,0.0043 ⁰.0555,0.0065 0.0065,2.433 30.4572 Bq/kg respectively.The average radioactivity decreased in ⁴⁰K、²³⁸U、²³²Th、²²⁶Ra、¹³⁷Cs and ⁶⁰Co in regular order.The committed effective dose of all radionuclides are 39.21μSv/a among which the artificial radionuclide part is 0.03 μSv/a.Conclusion No artificial radionuclides were detected except trace amounts of ¹³⁷Cs and ⁶⁰Co in the surrounding areas of Haiyang Nuclear Power Plant.The concentrations of all radionuclides in food are lower than the national standard limits which will lead a little dose burden.更多还原