JAEA
  • help
  • PC | SP
  • JP | EN
          
Refine your search：     
Report No.
 - 
Clear All
Search Results: Records 1-2 displayed on this page of 2
  • 1

Presentation/Publication Type

Initialising ...

Refine

Journal/Book Title

Initialising ...

Meeting title

Initialising ...

First Author

Initialising ...

Keyword

Initialising ...

Language

Initialising ...

Publication Year

Initialising ...

Held year of conference

Initialising ...

Save select records

Journal Articles

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

Environmental Science & Technology, 60(17), p.13123 - 13131, 2026/05

https://doi.org/10.1021/acs.est.5c18263
 Times Cited Count：0 Percentile：0.00(Engineering, Environmental)

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.

Oral presentation

Distribution of iodine-129 in the Japan Sea and the Bering Sea; Oceanographic insights

Suzuki, Takashi; Otosaka, Shigeyoshi*; Kuwabara, Jun; Nishioka, Jun*

no journal, , 

$$^{129}$$I concentrations in seawater from the Japan Sea and the Bering Sea were measured to evaluate its applicability as an oceanographic tracer. Surface seawater concentrations of $$^{129}$$I in the Japan Sea were higher than those in the Bering Sea, likely reflecting atmospheric transport patterns of $$^{129}$$I. Vertical profiles showed decreasing concentrations with depth, and in the Japan Sea, anthropogenic $$^{129}$$I was observed to reach bottom waters. The total inventory was higher in the Japan Sea, which is attributed to its unique circulation structure and topographic constraints. Furthermore, the turnover time of Japan Sea Bottom Water was estimated to be 200-520 years, demonstrating its usefulness as a tracer for ocean circulation.

2 (Records 1-2 displayed on this page)
  • 1