http://www3.nhk.or.jp/daily/english/10_04.html* This is what they admit to, cautious observers know to double that..
Japan's Nuclear Safety Commission says a new aerial map of radioactive fallout contamination has confirmed the radiation levels in the area near the Fukushima Daiichi nuclear power plant.
The commission's chairman, Haruki Madarame, told reporters on Monday that the map will reinforce the agency's system to monitor contamination and will help find ways to lower radiation levels.
The Japanese Science Ministry and the US Energy Department conducted a joint aerial survey from April 6th to the 29th of the area within an 80-kilometer radius of the plant.
The map shows the density of radioactive cesium in red or yellow, depending on the concentration in the soil.