¹³⁴Cs and ¹³⁷Cs activities in coastal seawater along Northern Sanriku and Tsugaru Strait, northeastern Japan, after Fukushima Dai-ichi Nuclear Power Plant accident

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• 作者：M. Inoue^a ; ^{mutsuo@llrl.ku-unet.ocn.ne.jp} ; H. Kofuji^b ; Y. Hamajima^a ; S. Nagao^a ; K. Yoshida^a ; M. Yamamoto^a
• 关键词：134Cs ; 137Cs ; Coastal seawater ; Northern Sanriku ; Fukushima Dai-ichi Nuclear Power Plant accident
• 刊名：Journal of Environmental Radioactivity
• 出版年：2012
• 期刊代码：45_0265931x
• 类别：env
• 出版时间：September, 2012
• 卷：111
• 期：Complete
• 页码：116-119
• 文件大小：303 K

摘要

A total of 37 seawater samples were collected at 10 sites along the coastline of the Northern Sanriku and Tsugaru Strait, 250-450聽km north of the Fukushima Dai-ichi Nuclear Power Plant in April-December 2009 and May-June 2011, and analyzed for ¹³⁴Cs and ¹³⁷Cs activities using low-background 纬-spectrometry. The ¹³⁴Cs and ¹³⁷Cs activities measured in these samples in May 2011 were found to be 2-3聽mBq/L and 2.5-4聽mBq/L, respectively. By June, these values had decreased by 25-45%/month and 5-30%/month, respectively. These results can be plausibly explained by surface infusion of these isotopes into the sea by atmospheric transport from Fukushima and their subsequent reduction by water migration to off-shore and deeper regions.