Temporal variations of radionuclides in seabed sediments off Ibaraki coast

Nagaoka, Mika ; Yokoyama, Hiroya; Matsubara, Natsumi; Fujita, Hiroki; Nakano, Masanao ; Watanabe, Hitoshi

The radiological impact of the radionuclides released from the Fukushima Daiichi Nuclear Power Station to the sea offshore of Ibaraki has been studied in this research. Fifty-one seabed sediments were collected in 2012, 2013 and 2014, respectively. Then, all samples were measured for the activities of $^{134}$ Cs and $^{137}$ Cs and some samples were analyzed for the activities of $^{90}$ Sr. The results indicated that the activities of $^{134}$ Cs and $^{137}$ Cs were elevated by the accident and showed a decreasing tendency between 2012 and 2014. The tendency of activity in Kuji Riverestuary area was different from Ibaraki coast area. The difference could be caused by geological feature and grain size of seabed sediment etc. On the other hand, $^{90}$ Sr activities were ND-0.26 Bq/kg dry. It was no correlation between $^{90}$ Sr and $^{137}$ Cs activity. The $^{90}$ Sr activity released by the accident was small influence on seabed sediment collected around sea offshore of Ibaraki.

Language	:	Japanese
Journal	:	KEK Proceedings 2015-4
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Pages	:	p.214 - 218
Publication Year/Month	:	2015/11
Meeting title	:	第16回環境放射能研究会
Held date	:	2015/03
Location (city)	:	つくば
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
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Article of JAEA R&D Review	:
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Registration No. : BB20143123
JAEA Abstracts No. : 44001465
Paper Submission No. : 18140

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