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Report No.
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Preliminary estimation of release amounts of $$^{131}$$I and $$^{137}$$Cs accidentally discharged from the Fukushima Daiichi Nuclear Power Plant into the atmosphere

Chino, Masamichi; Nakayama, Hiromasa; Nagai, Haruyasu; Terada, Hiroaki; Katata, Genki; Yamazawa, Hiromi*

The release amounts of $$^{131}$$I and $$^{137}$$Cs into the atmosphere due to the Fukushima Daiichi Nuclear Power Plant is preliminary estimated by coupling monitoring data on air concentrations and atmospheric dispersion simulation assuming unit release rate (1 Bq/h). The estimated results show that the large amount of release, the peak value of about 10$$^{16}$$ Bq/h of $$^{131}$$I on March 15, continued for a week after the accident, and, after March 23, the release rates have generally been declining to the order of 10$$^{11}$$ to 10$$^{12}$$ Bq/h. The total amounts of $$^{131}$$I and $$^{137}$$Cs discharged into the atmosphere are estimated about 1.5$$times$$10$$^{17}$$ Bq and 1.2$$times$$10$$^{16}$$ Bq.

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