Tepco (Tokyo Electric Power Company) here provides a useful summary of daily radiation conditions at the Fukushima Daiichi Nuclear Power Plant complex.
A series of 8 monitoring posts recently measured an average air radiation level of just over 5 microsieverts per hour along the perimeter from north to west to the south end of the facility.
On March 4, 2013, the level in the air at the west gate was measured at 6 microsieverts per hour.
At the main gate, the level increased to 20 microsieverts per hour.
On the south side of the main building for the power station, the level leaped to 200 microsieverts per hour, varying little throughout the day, between 191-201 microsieverts per hour. Working at that last location outside for 8 hours a day for just under 4 days would give an American a typical ANNUAL dose of radiation.
