A circle of 20km is 1200 km^2. In this case, only half the circle was over land, but the evacuation zone also extended about 40km downwind, based on the amount

A circle of 20km is 1200 km^2. In this case, only half the circle was over land, but the evacuation zone also extended about 40km downwind, based on the amount of radiation, so the original exclusion zone was also about 1200 km^2. Since then, part of the exclusion has been lifted: I think in this map, the green areas are places which are no longer restricted. The yellow areas can be visited with a permit, but you are not allowed to live in them or stay over night. The pink area is the "difficult to return" zone, I think the government treats this as a total loss and reimburses house owners for the full value of their property. http://userdisk.webry.biglobe.ne.jp/001/285/53/N000/000/009/138387581709871406225.jpg http://userdisk.webry.biglobe.ne.jp/001/285/53/N000/000/009/... From counting pixels in the picture, it seems the yellow+pink area is 670 km^2, and the pink area is 330 km^2.