2019—2021年河北省某铀矿周围主要食品放射性核素检测分析

Detection and analysis of main food radionuclides around a uranium mine inHebei Province from 2019-2021

目的了解河北省某铀矿周围地区食品放射性水平,建立铀矿运行期间的放射性基线值,提高核事故应急监测水平,为评估食品安全风险提供参考依据。方法利用高纯锗γ谱仪对2019—2021年河北省某铀矿山周围主要生产食品的放射性核素进行检测,并对数据进行分析。结果2019—2021年铀矿周围主要食品放射性核素238U、232Th、226Ra、40K、137Cs比活度范围值分别为<方法检测限(method detection limit,MDL)~(1.14±0.23)、<MDL~(0.163±0.047)、<MDL~(1.02±0.11)、(8.5±1.5)~(319.0±32.0)、<MDL~(0.295±0.084)Bg/kg。2019、2020、2021年铀矿周围生产主要食品所致年有效剂量为93.54、42.43和154.71 uSv/a。结论河北省某铀矿周围食品放射性核素水平远远低于国家限值,居民因食入当地产食品所致年待积有效剂量与联合国原子辐射效应科学委员会2000年报告相符合,微量人工放射性核素137Cs不会对居民健康造成危害。

Objective To investigate the radioactivity level of food around a uranium mine area in Hebei Province,establish the radioactivity baseline value during the normal operation of the uranium mine,improve the level of emergency monitoring of nuclear accidents,and provide a scientific basis for evaluating food safety risks.Methods The high-purity germanium gamma spectrometer was used to detect the radionuclides of the main food produced around a uranium mine area in Hebei Province from 2019 to 2021,and the data were analyzed.Results From 2019 to 2021,the specificactivity ranges of 238U,232Th,226Ra,40K,137Cs,which are main food radionuclides around the uranium mine,were method detection limit(MDL)-(1.14±0.23),MDL-(0.163±0.047),MDL-(1.02±0.11),(8.5±1.5)-(319.0±32.0),MDL-(0.295±0.084)Bg/kg,respectively.The annual effective dose caused by the main food produced around the uranium mine in 2019,2020 and 2021 was 93.54,42.43 and 154.71 uSv/a,respectively.Conclusion The level of radionuclides in food around a uranium mine in Hebei Province is far below the national limit,the annual accumulated effective dose of residents due to ingestion is consistent with the United Nations Scientific Committee on the Effects of Atomic Radiation 2000 report,and the trace amount of artificial radionuclide 137Cs will not cause harm to the health of residents.