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Source term estimation of atmospheric release due to the Fukushima Dai-ichi Nuclear Power Plant accident by atmospheric and oceanic dispersion simulations

Kobayashi, Takuya ; Nagai, Haruyasu ; Chino, Masamichi; Kawamura, Hideyuki 

The source term of the atmospheric release of $$^{131}$$I and $$^{137}$$Cs due to the Fukushima Dai-ichi Nuclear Power Plant accident estimated by previous studies was validated and refined by coupling atmospheric and oceanic dispersion simulations with observed $$^{134}$$Cs in seawater collected from the Pacific Ocean. By assuming the same release rate for $$^{134}$$Cs and $$^{137}$$Cs, the sea surface concentration of $$^{134}$$Cs was calculated using the previously estimated source term and was compared with measurement data. The release rate of $$^{137}$$Cs was refined to reduce underestimation of measurements, which resulted in a larger value than that previously estimated. In addition, the release rate of $$^{131}$$I was refined to follow the radioactivity ratio of $$^{137}$$Cs. As a result, the total amounts of $$^{131}$$I and $$^{137}$$Cs discharged into the atmosphere from 5 JST on March 12 to 0 JST on March 20 were estimated to be approximately 2.0$$times$$10$$^{17}$$ and 1.3$$times$$10$$^{16}$$ Bq, respectively.

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Category:Nuclear Science & Technology

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