The radiation spread in Japan...wider and higher.

Caught this post on Smart Planet about the radiation levels resulting from the Fukushima nuclear plants.  Japanese bloggers are updating this map of measured radiation levels.  Hovering over the colored squares shows you the date and reading; most of the readings were done in the past two weeks.

You can perform the calculations yourself; suffice to say, 0.5 microsieverts per hour is nothing to laugh at, over a prolonged period of time.  You can see how the exclusion zone is wholly inadequate.  And yes, parts of Tokyo are affected.