No, you're not welcome to go live in Fukushima. First, it's almost impossible to get a residency visa to live in Japan, unless you are being sponsored for a job that nobody in Japan can do. There aren't any of these jobs in Fukushima. Second, even if you do manage to get a visa, the government has forcibly evacuated the area around Fukushima and is not allowing residents to return. The odds of a new resident being allowed to move into the area are zero.
All up, even well informed people, who are willing to accept the risks (if any) of low level radiation exposure, are not allowed to live in Fukushima. It must really suck for the people who were forced to leave their lives behind.