摘要
目的 调查辽宁红沿河核电站运行前周边地区食品和饮用水以及环境放射性本底水平。方法 监测核电站周边30 km范围内12个采样点的食品、饮用水、土壤中γ核素浓度和2个采样点的沉降灰、气溶胶放射性水平以及地表天然γ辐射水平，并估算当地居民由膳食摄入所致内照射剂量。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，其中食品中 137Cs平均活度水平（0.029±0.043）Bq/kg。饮用水中总α放射性水平（0.07±0.06）Bq/L，总β放射性水平为（0.32±0.35）Bq/L，沉降灰总β放射性水平（0.40±0.14）Bq·m-2·d-1，气溶胶样品中未发现人工核素，周边地区土壤中137Cs平均活度为（2.16 ± 1.37）Bq/kg。结论 核电站周边地区采集的食品中除微量137Cs外，未见其他人工γ核素，食品和饮用水中放射性核素水平均低于国家标准限值，沉降灰及气溶胶放射性水平在正常本底范围，居民由食入人工核素137Cs所致年有效剂量为0.18 μSv/年。
Objective To investigate the radioactivity levels in food, drinking water and the environment in the areas around Hongyanhe nuclear power plant （NPP） before operation. Method The radioactivity monitoring was performed within 30 km of Hongyanhe NPP at 12 sampling sites by detecting food, drinking water, soils and gamma radiation level, and the samples of atmosphere aerosols and precipitations were monitored at 2 sampling sites. The effective doses of local residents by ingestion were estimated. Results The major radionuclides in food were 238U,226Ra,232Th,40K and 137Cs. The average levels of 137Cs in food were（0.029±0.043）Bq/kg. The average gross-alpha and gross-beta activities in drinking water were （0.07±0.06）Bq/L and（0.32±0.35）Bq/L, respectively. The gross-beta activities of precipitations were （0.40±0.14）Bq·m-2·d-1. The concentrations of man-made radionuclides in atmosphere samples were lower than the lower detection limits. The average levels of 137Cs in nearby soils were （2.16 ± 1.37）Bq/kg. Conclusions No man-made gamma radionuclides can be found in the food collected nearby except 137Cs. The concentrations of radionuclides in food and drinking water are lower than the relevant national limits and the radioactivity levels of atmosphere aerosols and precipitations are at normal background level. The effective dose to local residents by ingestion of man-made 137Cs is 0.18 μSv/year.
出处
《中华放射医学与防护杂志》
CAS
CSCD
北大核心
2013年第6期648-652,共5页
Chinese Journal of Radiological Medicine and Protection
关键词
红沿河核电站
放射性水平
运行前
有效剂量
Hongyanhe nuclear power plant Radioactivity levels Before operation Effective doses
