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为了解福岛核泄漏放射性核素对北太平洋公海渔场的后续性污染影响情况,于2013年8—11月在北太平洋公海渔场(40°—44°N、145°—160°E)采集柔鱼样品,利用超低本底HPGeγ谱仪分析5种放射性核素.结果表明:134Cs和110mAg未检测出高于本底值的比活度,而~(210)Pb、~(137)Cs和40K均有检出.其中~(210)Pb在柔鱼体的比活度范围为0.99~7.60 Bq·kg-1,137Cs的比活度范围为最低检测限~0.37 Bq·kg-1,40K的比活度范围为46.00~107.00 Bq·kg-1.~(210)Pb核素含量在柔鱼250~300 mm胴长组分布最高;在200~250和>400 mm胴长组中最低.~(137)Cs含量在柔鱼200~250 mm胴长组中最高;在250~300和350~400 mm胴长组较低.40K核素含量在柔鱼250~300 mm胴长组中最高,在150~200 mm胴长组最低,总体分布比较均匀.3种核素在柔鱼的不同组织中含量不同,但均在内脏中含量最高.通过风险评估发现,北太平洋公海渔场所有检测的海洋生物的放射性核素含量值与基准值的熵值均未超过1,说明目前核辐射对该海域渔业资源的影响暂无大风险.研究可为福岛核事故对海洋环境生态影响及公众健康危害评估提供理论依据.
In order to understand the impact of Fukushima nuclear leak radionuclide on the follow-up pollution of the North Pacific Ocean high-lying fishery, the soft-shelled turtle was collected at the North Pacific Ocean Fishing Ground (40 ° -44 ° N, 145 ° -160 ° E) from August to November 2013 The results showed that the specific activity of 134Cs and 110mAg was higher than the background value, while the contents of ~ (210) Pb, ~ (137) Cs and 40K, and the specific activity range of ~ (210) Pb in squid was 0.99 ~ 7.60 Bq · kg-1, and the specific activity range of 137Cs was the lowest detection limit ~ 0.37 Bq · kg -1 The specific activity was in the range of 46.00-107.00 Bq · kg-1. The content of ~ (210) Pb nuclide was the highest in the 250-300 mm length of Ommastrepheline, and the lowest in the length of 200-250 mm and> 400 mm. (137) The content of Cs was the highest among 200-250 mm length of Ommastrepteryx long group, lower in the length of 250-300 mm and 350-400 mm, and the content of 40K was the highest among 250-300 mm length of Ommastrepteryx. In 150 ~ 200 mm body length group, the lowest and the overall distribution is more uniform.The content of the three kinds of radionuclides in different tissues of squid is different, but they are all highest in the internal organs.Through the risk assessment, it is found that all the detected oceans in the open sea fishery of the North Pacific Ocean Biological radionuclides Entropy value and the reference value of no more than 1, indicating that the effects of nuclear radiation is currently the fishery resources of the waters No big risk. Fukushima nuclear accident study can provide a theoretical basis for the assessment of the ecological impact of the marine environment and public health hazards.