Reuters reported today:
Residents outside the Fukushima exclusion zone were likely most exposed to radiation in the four months after the nuclear plant was wrecked by the March 11 earthquake and tsunami, the local government said on Tuesday.
Their exposure of 19 millisieverts is just below the annual limit set by an international nuclear safety body, it said.
The greatest exposure was in the town of Iitate, where residents were allowed to take their time to leave, located 40 km (25 miles) northwest of the plant and outside the 20 km evacuation zone imposed by the government.
The report says that those outside the zone more likely to take their time leaving their homes, and were exposed to more radiation:
According to the estimates, those living within the 20 km zone, who were urged to leave quickly, were likely exposed to 0.18 to 2.3 millisieverts in the four months after the disaster.
That is less than the estimated 0.84-19 millisieverts for those living near the plant but outside the evacuation zone.
Reuters also reported:
“The research categorises residents’ behaviour into 18 patterns to come up with the estimated exposure for each group. There is a possibility some people have been subject to heavier exposure,” an official at the Fukushima local government said.