Kyodo News has the latest update here, with the following related information:
[O]ne of seven workers who were injured following a March 14 hydrogen explosion at the No. 3 reactor was found to have been exposed to radiation amounting to over 150 millisievert per hour.
The level is lower than the maximum limit of 250 millisievert per hour set by the health ministry for workers tackling the emergency at the Fukushima plant.
An emergency worker in the US is permitted a once in a lifetime maximum single exposure of 250 mSv. Added to normal radiation exposure over the course of a lifetime, such exposure raises lifetime totals from a normal 484 mSv to 734 mSv, 52 percent more than normal.
