Meanwhile,
http://www3.nhk.or.jp/daily/english/04_32.html
Radiation measurements have exceeded levels at which people are advised to stay indoors in a town outside the 30-kilometer radius of the damaged Fukushima Daiichi nuclear plant
...
A nuclear expert has pointed out that the government should explain the details of the finding to the residents.
MEANWHILE :
Fukushima Radiation: Modeling Shows Limited Spread in Ocean
http://news.sciencemag.org/scienceinsider/2011/04/fukushima-radiation-modeling-shows.html?ref=hp