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Take a listen to the video on that page (scroll down).
Radiation fallout on UShttp://www.youtube.com/watch?v=QgVpY_CMepU&feature=share
Japan's radiation monitors
Updated 2/16/12
I don't know what the measurement means, but Fukushima's magnitudes higher than anywhere else. I don't recall seeing it this high after the event.
Fukushima 6702 nGy/h
Ibaraki 137
Fukui/Kyoto 76
Osaka 56
Saga/Nagasaki 33
http://www.bousai.ne.jp/eng/index.html
RadChick Radiation Research & Mitigationhttp://www.facebook.com/pages/RadChick-Radiation-Research-Mitigation/260610960640885?sk=wall