The german Gesellschaft für Anlagen- und Reaktorsicherheit (GRS) (which is owned by the state of Germany to about one half ) has regularily updated information (in english) about the Fukushima plant and other plants at trouble at:
The report is by order of the german ministry for the environment.
The japanese Ministry of Education, Culture, Sports, Science & Technology has a japanese website on the Readings at Monitoring Post out of 20 Km Zone of Fukushima Dai-ichi NPP at:
and of Readings of environmental radioactivity level by prefecture at:
A partial translation of the pdf’s is possible via google translate
update 19.3.2011: there are now also english pdf’s of the measurements
update 20.3.2011: The above mentioned grs has also a website about the potential dangers of radiation however the old one, which is still in the Google cache was currently a bit more informative. There they say as a “rule of thumb” that
Als Faustregel gilt, dass die Aufnahme von etwa 80 000 Bq Cs-137 bei Erwachsenen einer Strahlenexposition von etwa 1 mSv entspricht.
translation without guarantee: 80 000 Bq of Cs-137 for an adult equates to about 1 mSv.
The limit of import into Germany for caesium is 600 Bq/kg. For milk, milkproducts and kids nutrition is 370 Bq/kg. For the beginning of May 1986 (shortly after Chernobyl) the Commission for radiation safety recommended to eat and drink only milk with less than 500 Bq/l of Iodine 131 and green vegetables with less then 250 Bq/kg of Iodine 131 .