<sup>90</sup>Sr in marine environment: Comparison of seas surrounding Japan and the South China Sea

Lin Wuhui; He Jianhua; Yu Kefu; Du Jinqiu; Deng Fangfang; Liang Lin; Li Junyi; He Xianwen; Chen Baocai; Feng Liangliang

doi:10.3969/j.issn.0253-4193.2020.10.005

Volume 42 Issue 10

Nov. 2020

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Lin Wuhui，He Jianhua，Yu Kefu, et al. 90Sr in marine environment: Comparison of seas surrounding Japan and the South China Sea[J]. Haiyang Xuebao，2020, 42(10)：47–58 doi: 10.3969/j.issn.0253-4193.2020.10.005

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Lin Wuhui，He Jianhua，Yu Kefu, et al. ⁹⁰Sr in marine environment: Comparison of seas surrounding Japan and the South China Sea[J]. Haiyang Xuebao，2020, 42(10)：47–58 doi: 10.3969/j.issn.0253-4193.2020.10.005

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⁹⁰Sr in marine environment: Comparison of seas surrounding Japan and the South China Sea

doi: 10.3969/j.issn.0253-4193.2020.10.005

1.
School of Marine Sciences, Guangxi University, Nanning 530004, China
2.
Guangxi Key Laboratory on the Study of Coral Reefs in the South China Sea, Nanning 530004, China
3.
Third Institute of Oceanography, Ministry of Natural Resources, Xiamen 361005, China
4.
National Marine Environmental Monitoring Center, Dalian 116023, China
5.
Radiation-Environment Management and Monitoring Station of Guangxi Zhuang Autonomous Region, Nanning 530222, China

Received Date: 2020-04-02
Rev Recd Date: 2020-07-19

Available Online: 2020-11-13

Publish Date: 2020-10-25

Abstract

Abstract

⁹⁰Sr is recognized to be one of most important artificial radionuclides. A huge amount of radioactive substance (e.g., ⁹⁰Sr) was released into marine environment after the Fukushima Nuclear Accident (FNA). High ⁹⁰Sr activity was still observed in the treated wastewater which was stored on site in many tanks. However, ⁹⁰Sr was rarely investigated in marine environment due to its complicated and time-consuming analytical procedure after the FNA, constraining a comprehensive understanding of the fate of ⁹⁰Sr in marine environment. We discussed the ⁹⁰Sr activity and environmental half-life (EHL) in seas surrounding Japan (SSJ) and the South China Sea (SCS) on the basis of previous data and our ⁹⁰Sr data in seawater and marine biotas (e.g., sargassum, shrimp, oyster, mangrove, reef coral) collected from the SCS during 2015−2018. We found that the EHL of ⁹⁰Sr in the SSJ was 15.4 years during 1975−2010. ⁹⁰Sr in the SSJ was significantly elevated after the FNA. Radiation dose rate of ⁹⁰Sr on marine fish was increased by five orders of magnitude after the FNA relative to the baseline before the FNA. As the downstream basin of the North Pacific Subtropical Gyre, the SCS was not identified with noticeable ⁹⁰Sr-derived from the FNA. The EHL of ⁹⁰Sr in the SCS was calculated to be 26.7 years during 1984−2018 based on the compilation of historical ⁹⁰Sr data. The contrasting patterns of the EHL of ⁹⁰Sr and ¹³⁷Cs in the marginal seas and open oceans were attributed to the distinct sources (river input) and sinks (marine biological pump) of ⁹⁰Sr and ¹³⁷Cs. In the context of challenge of ⁹⁰Sr analytical method in marine environment, extremely high ⁹⁰Sr concentration factor (around 1000 L/kg) was observed in the reef coral skeleton after comparing with concentration factors of ⁹⁰Sr in more than 10 kinds of marine biotas. Additionally, reef coral is potential to be a reliable ⁹⁰Sr marine bioindicator with other advantages of easy availability in large quantity, growth at a fixed location, continue record with high resolution, and simple pretreatment. The study of ⁹⁰Sr in reef coral will not only help to reveal distinct sources and sinks of artificial radionuclides in marine environment, but also provide valuable insights to optimization and improvement of standards/guidelines of marine radioactivity monitoring program.
- Fukushima Nuclear Accident,
- radioactivity,
- seawater,
- biotas,
- sediment,
- reef coral

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References(88)

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