Je suis tombé sur ça,ça date d'aujourd'hui:
http://www3.nhk.or.jp/daily/english/01_39.html
The operator of the Fukushima Daiichi nuclear power plant says it has detected 10,000 millisieverts of radioactivity per hour at the plant. The level is the highest detected there since the nuclear accident in March.
According to the science ministry's brochure, if a human received 10,000 millisieverts, they would likely die within a week or two.