Japan: govt. chart shows levels of radioactivity in water throughout country

This chart released online by the government of Japan plots levels of radioactivity measured in drinking water in various cities. Also new, this data about radioactivity levels around the Fukushima nuclear plant. Also just released: a chart measuring levels of radioactivity in the rain throughout Japan. Google Translate can help, for those who don't read Japanese.

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Noodle

Are they dangerous levels of radioactivity or are they just being thrown out there?

FYI it’s mostly Iodine 131, which has an 8 day halflife – it’s a short lived product and they all seem to be dipping..
oheso

What’s up with Ibaraki-ken? And does anyone have a quick comparison of Becquerels/m2 with micro Sieverts?

Um, apparently not.
jphilby

And those translations can even be linked:
http://translate.google.com/translate?js=n&prev=_t&hl=en&ie=UTF-8&layout=2&eotf=1&sl=ja&tl=en&u=http%3A%2F%2Fatmc.jp%2Fame%2F&act=url