INESの基準では、レベル7の定義はヨウ素131換算で放射性物質の放出量が 数万テラベクレル以上としか書いて無いんだからごちゃごちゃ屁理屈言っても無意味だろ An event resulting in an environmental release corresponding to a quantity of radioactivity radiologically equivalent to a release to the atmosphere of more than several tens of thousands of terabecquerels of 131I