No, we're not evacuating because of radiation, we're evacuating to improve quality of daily life.
Riiiiight.
From Kyodo:
NEWS ADVISORY: Gov't prods people within 30 km of nuke plant to voluntarily leave: Edano
NEWS ADVISORY: Evacuation near plant to improve daily lives, not for safety reasons: Edano
NEWS ADVISORY: Radiation 10,000 times normal level found in water that hit workers
http://english.kyodonews.jp/news/2011/03/80872.html