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Atmospheric discharge and dispersion of radionuclides during the Fukushima Dai-ichi Nuclear Power Plant accident, 2; Verification of the source term and analysis of regional-scale atmospheric dispersion

Terada, Hiroaki   ; Katata, Genki; Chino, Masamichi; Nagai, Haruyasu  

Regional-scale atmospheric dispersion simulations were carried out to verify source term of $$^{131}$$I and $$^{137}$$Cs estimated by our previous studies and analyze the atmospheric dispersion during the Fukushima Dai-ichi Nuclear Power Plant accident with measurements of daily and monthly surface depositions over land in Eastern Japan from March 12 to April 30, 2011. The prediction accuracy of daily surface deposition by using the refined source term was mostly within a factor of 10 without apparent biases. Therefore, the estimated source term is reasonable during the period when the plume flowed over land in Japan. The analysis of regional-scale atmospheric dispersion suggested that the distribution of a large amount of $$^{137}$$Cs deposition was produced mainly on March 12, 15-16, 20, and 21-23. The ratio of wet deposition to total one varied in wide range depending on the degree of influence by each event.

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