See: http://enenews.com/just-in-tepco-estimates-total-cesium-137-release-from-fukushima-at-360000-terabecquerels-4-times-higher-than-chernobyls-85000-terabecquerels
and: http://www.yomiuri.co.jp/dy/national/T120523005514.htm
plus: https://en.wikipedia.org/wiki/Caesium-137