北部湾近海某海域主要海产品放射性水平分析  

Analysis of radioactivity level of main seafood in a sea area offshore Beibu Gulf

作　　者：赵新春[1] 冯兰英[1] 吴应宇[1] 卢秀芳[1] 谢萍[1] ZHAO Xinchun;FENG Lanying;WU Yingyu;LU Xiufang;XIE Ping(Institute of Radiation Health and Protection,Guangxi Zhuang Autonomous Region Center for Disease Control and Prevention,Nanning 530028 China)

机构地区：[1]广西壮族自治区疾病预防控制中心放射卫生防护所,广西南宁530028

出　　处：《中国辐射卫生》2021年第6期687-692,共6页Chinese Journal of Radiological Health

基　　金：广西壮族自治区卫生健康委员会科研项目(Z20190178)。

摘　　要：目的调查北部湾近海某海域主要海产品放射性水平。方法采用高纯锗(HP-Ge)γ能谱仪对所采集的海产品进行检测分析。结果10份样品均能检出^(226)Ra和^(40)K,检出范围分别为(0.069~4.95)Bq/kg和(34.0~114.9)Bq/kg;4份样品能检出^(238)U,检出范围为(0.142~0.660)Bq/kg;7份样品能检出微量^(137)Cs,检出范围为(0.012~0.078)Bq/kg;除1份巴浪鱼样品^(232)Th结果异常外,其余9份样品^(232)Th检出范围为(0.206~9.81)Bq/kg。结论该海域海产品中的^(238)U、^(137)Cs的放射性水平均在全国调查水平范围值以内;2种海产品中的^(226)Ra放射性水平高于全国调查水平;5种海产品中的^(232)Th的放射性水平明显高于全国调查水平,其中1份巴浪鱼样品中^(232)Th比活度为23.2 Bq/kg(折算为5.71 mg/kg),超出国家标准限值(3.6 mg/kg),巴浪鱼采样区域海底底泥及海水的天然放射性核素检测结果均在文献的范围值内,人工放射性核素放射水平均低于仪器的探测下限。巴浪鱼样品放射水平异常原因不明,需进一步调查并长期对该区域海产品放射性进行监测。Objective To investigate the radioactivity level of main seafood in the offshore area near the Beibu Gulf.Method High purity germanium(HP-GE)γspectrometer was used to detect and analyze the collected seafood.Results ^(226)Ra and 40 K could be detected in all the 10 samples and the detection ranges were(0.069~4.95)Bq/kg and(34.0~114.9)Bq/kg,respectively.^(238)U could was detected in four samples,and the detection range was(0.142~0.660)Bq/kg.^(137)Cs could be detected in seven samples and the detection range was(0.012~0.078)Bq/kg.The detection range of ^(232)Th in the other 9 samples was(0.206~9.81)Bq/kg,except for one sample with abnormal result.Conclusion The radioactivity levels of ^(238)U and ^(137)Cs in seafood in this area were all within the range of the national investigation level.The radioactivity level of ^(226)Ra in two kinds of seafood was higher than that in the national survey.The radioactivity level of ^(232)Thin five kinds of seafood was significantly higher than that in the national survey.The specific activity of ^(232)Thin one sample of balang fish was 23.2 Bq/kg(5.71 mg/kg),which exceeded the national standard limit(3.6 mg/kg).The detection results of natural radionuclides in the seabed sediment and sea water in the sampling area were all within the range of the literature,and the radioactivity levels of artificial radionuclides were all lower than the detection limit of the instrument.The reason for the abnormal radioactivity level of balang fish samples is unknown,and further investigation and long-term monitoring of radioactivity of seafood in this area are needed.

关 键 词：Γ能谱仪 放射性水平 比活度 放射性核素 放射性限制浓度 

分 类 号：X591[环境科学与工程—环境工程]