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目的:调查三门核电站周围环境辐射累积剂量水平及周边海水海产品中n 137Cs含量。n 方法:2015—2019年，在三门县境内设置60个监测点，监测环境辐射累积剂量；以核电厂排水口为起点，5 km范围内设置6个监测点采集海水，测定海水中n 137Cs；采集核电站周围海域的当地居民经常食用的紫菜、带鱼、鲻鱼，测定海产品中n 137Cs。n 结果:2015—2019年，核电站周围环境辐射累积剂量范围为0.321～0.411 mSv；5 km范围内海水中n 137Cs活度浓度范围为0.579～2.119 mBq/L；附近海域紫菜、带鱼、鲻鱼中n 137Cs的活度浓度范围分别为0.498～0.672、0.399～0.493、0.267～0.371 Bq/kg，均低于《食品中放射性物质限制浓度标准》(GB 14882-94)指导值。n 结论:三门核电站周围环境辐射累积剂量及周边海水海产品中n 137Cs的浓度处于本底水平。n “,”Objective:To investigate the cumulative dose level arising from environmental radiation and the concentration level of n 137Cs in seawater and seafood around Sanmen nuclear power plant.n Methods:From 2015 to 2019, 60 monitoring sites were set up in Sanmen county to monitor the cumulative dose from environmental radiation. Starting from the outlet of the nuclear power plant, a total of 6 monitoring points were set within 5 km to determine n 137Cs concentration in seawater. Nori, hairtail and mullet around the nuclear power plant were collected to determine n 137Cs concentration in seafood.n Results:From 2015 to 2019, the cumulative dose from environmental radiation were 0.321-0.411 mSv.The concentrations of n 137Cs were 0.579-2.119 mBq/L in seawater around the nuclear power plant within 5 km; 0.498-0.672 in nori, 0.399-0.493 in hairtail and 0.267-0.371 Bq/kg in mullet, respectively, all lower than the standard values specified in the “Standard for the concentration of radioactive substances in food” (GB 14882-94).n Conclusions:Around Sanmen nuclear power plant, the cumulative doses from environmental radiation, concentration of n 137Cs in seawater and seafood are at the background level.n