Sinking flux of radiocesium in the region off Fukushima

Otosaka, Shigeyoshi ; Suzuki, Takashi ; Nakanishi, Takahiro ; Narita, Hisashi*; Kato, Yoshihisa*

Between August 2011 and July 2012, sinking particles were collected with a sediment trap deployed at 100 km east of the Fukushima Daiichi Nuclear Power Plant. Concentration of $^{134}$ Cs in sinking particles varied between 5 and 415 Bq/kg and was highest on December 2011. In this period, sinking particles predominantly consisted of lithogenic particles and the highest carbon/nitrogen ratio was observed, indicating resuspension of seabed sediment in the near-shore regions. From these results, it can be inferred that accident-derived radiocesium in the near-shore seabed was transported to the offshore region and increased $^{134}$ Cs concentration in sinking particles.

Language	:	Japanese
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Meeting title	:	2013年度日本海洋学会春季大会
Held date	:	2013/03
Location (city)	:	東京
Location (country)	:	日本
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Keywords	:	福島第一原子力発電所事故; Fukushima Daiichi Nuclear Power Station Accident
Research Facility	:	第4研究棟
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Article of JAEA R&D Review	:
Cooperating Institute	:	東海大学

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Registration No. : BB20122896
JAEA Abstracts No. :
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