Daily radiation readings from Fukushima Prefecture [View all]
The following website provides radiation measurements from Fukushima Prefecture that are taken twice a day-- once at either 9:00 or 10:00 a.m., and again at 5:00 p.m., and are updated accordingly. Measurements are taken by the Disaster Management Office of Fukushima Prefecture, and by the Japanese Ministry of Education, Culture, Sports, Science and Technology.
http://www.nhk.or.jp/fukushima/wind/index2.html
The municipalities listed in the table at the bottom of the page are as follows:
福島市 Fukushima City
郡山市 Koriyama City
白河市 Shirakawa City
会津若松市 Aizuwakamatsu City
南会津町 Minami Aizu Town
南相馬市 Minami Soma City
いわき市 Iwaki City
玉川村 Tamakawa Village
飯舘村 Iidate Village
田村市船引 Tamura City-- Funehiki
田村市常葉 Tamura City-- Tokiwa
二本松市 Nihonmatsu City
伊達市 Date City
本宮市 Motomiya City
The numerical values to the right of the city names represent: 1) normal radiation level, 2) current radiation level, 3) distance from the reactors. Note that all of the measuring points are outside of the 20km exclusion zone.