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Vertical distribution of $$^{129}$$I released from the Fukushima Daiichi Nuclear Power Plant in the Kuroshio and Oyashio current areas

Suzuki, Takashi  ; Otosaka, Shigeyoshi  ; Kuwabara, Jun ; Kawamura, Hideyuki  ; Kobayashi, Takuya 

To investigate the penetration of radionuclides released from Fukushima Daiichi Nuclear Power Plant (FDNPP), depth profiles were revealed at Kuroshio current, transition, and Oyashio current areas. The FDNPP-derived $$^{129}$$I was found in surface layer at Oyashio current and transition areas and in sub-surface layer at Kuroshio current area. Moreover, it was found that the FDNPP-derived $$^{129}$$I/$$^{134}$$Cs ratios in the Oyashio current and transition areas were higher than that in the FDNPP reactor. The higher FDNPP-derived $$^{129}$$I/$$^{134}$$Cs ratios suggest three potential mechanisms for the migration of radionuclides in the environment: (1) radioiodine was released more easily than radiocesium by the FDNPP accident, (2) $$^{129}$$I was supplied from the atmosphere by re-emitted $$^{129}$$I from contaminated areas around Fukushima, (3) leaked water that removed radiocesium reached the sampling stations. The FDNPP-derived $$^{129}$$I in sub-surface layer would be transported by the meander of the Kuroshio Extension current.

Language

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English

Journal

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Marine Chemistry

Volume

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204

Number

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Pages

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p.163 - 171

Publication Year/Month

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2018/08

Meeting title

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Held date

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Location (city)

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Location (country)

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Patent information

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PDF

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Paper URL

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https://doi.org/10.1016/j.marchem.2018.07.007

DOI for research data

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Keywords

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福島第一原子力発電所事故; ヨウ素129; 海水の沈み込み; 黒潮続流の蛇行; Fukushima Daiichi Nuclear Power Station Accident; $$^{129}$$I

Research Facility

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AMS(加速器質量分析装置)  

Press Release

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Article of JAEA R&D Review

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Exploring the Migration of Radionuclides to the Deep Ocean; Elucidation of Subduction from the Vertical Distribution of Concentration[/]

Cooperating Institute

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Accesses

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- Accesses

InCites™

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Percentile:10.86

Category:Chemistry, Multidisciplinary

Altmetrics

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