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

A total of 37 seawater samples were collected at 10 sites along the coastline of the Northern Sanriku and Tsugaru Strait, 250–450 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 γ-spectr...

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Bibliographic Details
Published in:Journal of environmental radioactivity 2012-09, Vol.111, p.116-119
Main Authors: Inoue, M., Kofuji, H., Hamajima, Y., Nagao, S., Yoshida, K., Yamamoto, M.
Format: Article
Language:English
Subjects:
134Cs
137Cs
Atmospherics
Cesium Radioisotopes - analysis
Coastal
Coastal seawater
Disasters
Earthquakes
Fukushima Dai-ichi Nuclear Power Plant accident
Geography
History, 21st Century
Japan
Marine
Northern Sanriku
Nuclear power generation
Nuclear power plants
Pacific Ocean
Radiation Monitoring - statistics & numerical data
Radioactive Fallout - analysis
Radioactive Hazard Release - history
Radioactive Hazard Release - statistics & numerical data
Radioactivity
Reduction
Sea water
Seawater - chemistry
Spectrometry, Gamma
Straits
Time Factors
Tsunamis
Water Pollutants, Radioactive - analysis
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Summary:A total of 37 seawater samples were collected at 10 sites along the coastline of the Northern Sanriku and Tsugaru Strait, 250–450 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 γ-spectrometry. The 134Cs and 137Cs activities measured in these samples in May 2011 were found to be 2–3 mBq/L and 2.5–4 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.
ISSN:0265-931X
1879-1700
DOI:10.1016/j.jenvrad.2011.09.012