Distribution of oceanic 137Cs from the Fukushima Dai-ichi Nuclear Power Plant simulated numerically by a regional ocean model
Title: Distribution of oceanic 137Cs from the Fukushima Dai-ichi Nuclear Power Plant simulated numerically by a regional ocean model
Author: Daisuke Tsumune, Takaki Tsubono, Michio Aoyama, Katsumi Hirose
Reference: Journal of Environmental Radioactivity, Volume 111, September 2012, Pages 100–108
DOI: http://dx.doi.org/10.1016/j.jenvrad.2011.10.007
Keywords: Fukushima reactor accident; Regional ocean model; Release rate; 137Cs; 131I/137Cs activity ratio
Abstract: Radioactive materials were released to the environment from the Fukushima Dai-ichi Nuclear Power Plant as a result of the reactor accident after the Tohoku earthquake and tsunami of 11 March 2011. The measured 137Cs concentration in a seawater sample near the Fukushima Dai-ichi Nuclear Power Plant site reached 68 kBq L−1 (6.8 × 104 Bq L−1) on 6 April. The two major likely pathways from the accident site to the ocean existed: direct release of high radioactive liquid wastes to the ocean and the deposition of airborne radioactivity to the ocean surface. By analysis of the 131I/137Cs activity ratio, we determined that direct release from the site contributed more to the measured 137Cs concentration than atmospheric deposition did.
URL: http://www.sciencedirect.com/science/article/pii/S0265931X11002463
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