It is an observation data today
http://ag.riken.jp/u/mon/2011-03-18.gif
Timezone : GMT+9:00
Unit : μSv/h 1000μSv/h=1mSv/h
Station : Tokai, Ibaraki
fukushima-100km-tokai(leeward)-115km-tokyo(leeward)
Tokyo to New York by airplane One way 0.19mSv
Hot spring(onsen) of radium 0.3-15μSv/h
X-ray computed tomography - Wikipedia, the free encyclopedia
Guarapari - Wikipedia, the free encyclopedia beach 5-15μSv/h
Please permit poor English. orz
Cryptanalysis is necessary for you.
set a goal：English at the same level as Johan Cruyff