论文部分内容阅读
目的 调查和掌握广西防城港核电站运行前周边地区食品放射性本底水平并估算当地居民由膳食摄入所致内照射剂量,为核事故应急响应和健康影响评估等积累基线数据,为政府制定核事故应急措施提供科学依据.方法 采用HP-Ge γ能谱仪对核电站周边30 km范围内所采集的食品进行检测分析.结果 仅能检出137Cs、238U、226Ra、232Th和40K5种放射性核素,比活度均值分别为(0.063±0.252)、(0.146±0.172)、(0.326±0.678)、(1.080±2.139)、(107.7±130.5) Bq/kg;检出比活度范围分别为(0.008 ～2.498)、(0.469～0.821)、(0.007 ～3.423)、(0.012 ～9.812)、(30.52～672.1) Bq/kg.结论 防城港核电站周边地区食品中放射性核素活度浓度均在国家标准限值以内,由食品摄入所致当地成人人均年待积有效剂量为197.16μSv/a,其中由人工核素137Cs所致的当地居民年待积有效剂量为0.158μSv/a,对公众所造成的附加剂量低于国家规定的限值,对人体的健康不会造成影响.“,”Objective To investigate and master food radioactivity background levels in the area around the FangChengGang Nuclear Power Plant before operation.And the internal doses of local residents by ingestion were estimated.The work aims to accumulate baseline data for nuclear accident emergency response and health impact assessment,and to provide a scientific basis for the government to formulate emergency measures for nuclear accidents.Methods HP-Ge gamma spectrometer was used to detect and analyze the food collected in the range of 30 km around the nuclear power station.Results 137Cs、238U、226Ra、232Th and 40K were detected in food samples.Their average radioactivity was (0.063 ± 0.252)、(0.146 ± 0.172)、(0.326 ± 0.678)、(1.080 ± 2.139)、(107.7 ± 130.5) Bq/kg;Their Specific activity range were (0.008 ～ 2.498)、(0.469 ～0.821) 、(0.007 ～3.423) 、(0.012～9.812) 、(30.52 ～672.1)Bq/kg.Conclusion The radioactivity concentration of food in the surrounding area of Fangchenggang nuclear power station is within the national standard limit,The committed effective dose of all radionuclides by ingestion food is 197.16μSv/a,and man-made 137 Cs contributes to 0.158 μSv/year.Its additional dose to the public is below the national limit and will not affect the health of the human body.