Any discussion of radiation health effects that does not talk about it quantitatively is pretty much a scam. Even if you hate math, it doesn't make the math go away. Radiation is not even remotely a yes or no issue, a safe or unsafe issue, or a black or white issue. Health effects are tied to cumulative doses and their effect on your probability of getting cancer. Any articles or discussion talking about "hot spots" or "lots of radiation" without numbers are by ignorant writers, and are probably intentionally designed to scare you. Articles about "billions of becquerels" are also designed to scare you, because the numbers sound big.
Here's a nice live map of radiation in Fukushima. It took 2 seconds to find it in Google. http://fukushima-radioactivity.jp/ It even has English.
Assuming you stay out of a 40km radius around the power plant, the vast majority of dark blue dots when you click on them show under 0.1 microsieverts per hour. Choko, when you took an international flight recently, you were most likely experiencing an average of 5.0 microsieverts per hour. That means you'd need 50 hours in those parts of Fukushima to pick up as much radiation as you picked up on 1 hour of your airplane flight.
Also compare the Fukushima radiation to other places shown on the 全国調査結果 bar. Okayama prefecture (0.06), Hiroshima prefecture (0.10), etc. Pretty much the same as the non-disaster area of Fukushima. All of them about half the normal natural background radiation in Hong Kong, if I'm not mistaken.
If you're between 40-70km from the disaster site, the worst measurements (dark green dots) are up to 1.0 microsievert per hour. So even if you ventured that close to the disaster, at worst they're still 5 times LOWER than the radiation on your airplane flight.
Here's some information on radiation from flights: http://aviationknowledge.wikidot.com/av ... -radiation. Your 5 microsievert per hour airflight radiation is only surpassed on that Fukushima map by the dark red dots, and just by a bit in most cases. I would not hang around those areas (within 30 km of the site) for too long if I were you, any more than I'd like to spend weeks onboard an international flight.
