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Long-term variations in $$^{129}$$I seawater concentrations off Fukushima and potential of 129I as an oceanographic tracer for ALPS-treated water

Suzuki, Takashi  ; Otosaka, Shigeyoshi*  ; Takata, Hyoe*; Kuwabara, Jun ; Nakanishi, Takahiro   ; Ikenoue, Tsubasa  

As a results of the 2011 Fukushima Daiichi Nuclear Power Plant accident, long-lived radioactive $$^{129}$$I has been released into the environment, with additional releases beginning in 2023 through ALPS-treated water. To study its long-term variation and potential as an oceanographic tracer, $$^{129}$$I concentrations in seawater off Fukushima were measured from 2012 to 2024. The highest concentration, 445$$times$$10$$^{-8}$$ Bq/L, was observed in 2013 near the plant. Levels have since declined toward the pre-accident value of 1.76$$times$$10$$^{-8}$$ Bq/L. Spatial and temporal changes in the $$^{129}$$I/$$^{137}$$Cs ratio indicate the influence of small water masses and support its use as a tracer in areas with complex ocean circulation.

Language

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English

Journal

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Environmental Science & Technology

Volume

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60

Number

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17

Pages

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p.13123 - 13131

Publication Year/Month

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2026/05

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Patent information

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Paper URL

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https://doi.org/10.1021/acs.est.5c18263

DOI for research data

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Link to research data related to this paper/report.

Keywords

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Iodine-129; $$^{129}$$I/$$^{137}$$Cs ratio; Fukushima NPP accident; ALPS-treated water; oceanographic tracer

Research Facility

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AMS(加速器質量分析装置)  

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JAEA R&D Navigator

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Cooperating Institute

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Accesses

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- Accesses

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