Current Fukushima resident here (about 60km away from the power station in question).
You know, I was just thinking recently that one of us should start a thread like this for the new JETs, but I thought it was better to wait til placements have come out...
Anyways, some things about radiation...
Every school and park where children often play in Fukushima has been fitted with real-time geiger counters, with digtal displays so that concerned persons can see exactly what the level in that particular place is.
The worldwide average background radiation is 2.4 millisieverts per year. That's 2400 micro sieverts per year. That's about 274 micro sieverts per hour. Off the top of my head, I believe that only Koriyama, Fukushima city, and areas such as Nihonmatsu are still over that level. IIRC, some places within those areas are about twice that.
The lowest dose of radiation exposure scientifically linked to an increase in cancer (based, IIRC, off data from hiroshima, nagasaki, chernobyl, and various atomic explosion tests) is 100 MILLI sieverts' exposure, in one go. That will increase your cancer risk by about 5% or so.
HOWEVER, most of the prefecture (I can't speak for Miyagi, Ibaraki, or anywhere else), is BELOW or about the SAME as the world average.
A word about quoted radiation levels:
Those figures will only reflect your radiaition exposure if you were to stand outside, naked, for a year. Clothing and walls will cut your exposure quite drastically. Most classrooms in my schols have levels 10% or less than what the geiger counter on the field reads.
As for food: I personally don't buy anything from Fukushima. It is tested before it goes on the shelves, BUT I've heard that the testing is random, and that's not good enough for me. On top of that, food radiation amounts are given in becquerals, rather than sieverts, and I just haven't been able to get good enough information on the amount of becquerals certain foods naturally contain, for me to do a good comparision as to whether or not the food in Fukushima is actually radioactive to a dangerous level.