2015—2019年三门核电站周围近海海水与三类海产品中90Sr放射性水平调查及人群剂量评估

目的 调查分析2015—2019年三门核电站周围近海海域海水与海产品中⁹⁰Sr放射性水平,估算食入海产品所致年待积有效剂量。方法 2015—2019年,在近海海域采集海水样品,并结合当地居民饮食习惯,采集三门当地3类常见海产品,测定分析⁹⁰Sr放射性水平,结合浙江省沿海地区居民海产品消费量估算人群年待积有效剂量。结果 2015—2019年,三门核电站近海海域海水中⁹⁰Sr放射性活度浓度范围为2.4~4.1 mBq/L,处于本底水平;3种海产品⁹⁰Sr放射性活度浓度范围为6.7×10^-2~1.3 Bq/kg （鲜重）,均低于《食品中放射性物质限制浓度标准》（GB 14882-94）指导值。三门县居民食用海产品摄入⁹⁰Sr所致年待积有效剂量为2.2×10^-4~4.2×10^-4 mSv,远低于全球内照射所致年待积有效剂量。结论 2015—2019年期间三门核电站周围海水及海产品中⁹⁰Sr放射性水平平稳,人群剂量负担轻微。

Investigation on 90Sr level in offshore seawater and seafood therein around Sanmen nuclear power plant site and assessment of committed effective dose from 2015 to 2019

Objective To investigate and analyze the radioactivity level of ⁹⁰Sr in offshore seawater and seafood therein around Sanmen nuclear power plant (NPP) and to estimate the annual committed effective dose to local population from ingestion of ⁹⁰Sr in seafood from 2015 to 2019. Methods From 2015 to 2019, the offshore seawater and 3 kinds of marine products grown locally in Sanmen and consumed by local residents were collected for measurement of the level of ⁹⁰Sr radioactivity. The committed effective doses to the local population were estimated based on monitoring result and consumption data on seafood in Zhejiang offshore. Results The radioactivity concentrations of ⁹⁰Sr ranged from 2.4 to 4.1 mBq/L in the seawater, close to the natural radioacrive background level and from 6.7×10^-2 to 1.3 Bq/kg in seafood, lower than the standard values specified in the "Limited concentrations of radioactive materials in foods" (GB 14882-94). Annual committed effective dose to the local population from ⁹⁰Sr attributable to consumption of seafood in Sanmen County from 2015 to 2019 were 2.2×10^-4-4.2×10^-4mSv, respectively, far lower than the worldwide committed effective dose result ing from internal exposure. Conclusions From 2015 to 2019, the radioactivity concentration of ⁹⁰Sr in seawater and seafood are stable, with neglectable dose burden to the local population.