By contrast, people on Earth are typically exposed to about 3 millisieverts a year.
Japanese authorities said they had measured radiation dose rates of up to 400 millisieverts-per-hour, IAEA reported.
FORBES: Fukushima's Last Stand: All But 50 Workers Evacuated
The career dose limit for 30-to-60-year-old male astronauts who never smoked ranges from 800 to 1, 200 millisieverts.
In normal circumstances, a passenger might receive a radiation dose of 0.1 millisieverts on such a journey, she explained.
By comparison, the typical American receives about 6.2 millisieverts a year from natural and man-made sources, including medical diagnostic procedures.
The highest number was 679 millisieverts, for a worker who helped to prepare venting as rising pressure threatened an explosion.
Thagard, the former NASA astronaut, said he was exposed to 120 millisieverts during his 115 days in low-Earth orbit aboard Mir.
According to the Nuclear and Industrial Safety Agency (NISA), robots inside the buildings measured radiation levels reached 57 millisieverts per hour.
FORBES: Radiation Dangerously High Inside Japanese Nuclear Power Plant
Outside Mr Sato's house, however, a reading of the equivalent of 150 millisieverts a year left your correspondent strangely reluctant to inhale.
ECONOMIST: The mounting human costs of Japan��s nuclear disaster
For female astronauts, the limit ranges from 600 to 1, 000 millisieverts.
Radiation doses are measured in units known as millisieverts, or mSv.
Many workers had already accumulated dosages of 100 millisieverts and more.
FORBES: Radiation Dangerously High Inside Japanese Nuclear Power Plant
That's a sizable chunk of an astronaut's career cap of 1, 000 millisieverts which many international space agencies use to limit the accumulated radiation dosage in space.
In two months it had reached almost 33 millisieverts, or a third the level normally permissible for those working on a nuclear accident in a year.
Of the 20, 115 people who have worked there since last March, 167 were exposed to 100 millisieverts or more, including six subjected to at least 250 millisieverts.
Zeitlin and his colleagues found voyagers could be exposed to between 554 and 770 millisieverts of ionizing radiation during the trip, depending on the level of solar activity.
This week in Tokyo, Wade Allison, a physics professor at Oxford University, argued that Japan's dose limit could safely be raised to 100 millisieverts, based on current health statistics.
ECONOMIST: The mounting human costs of Japan��s nuclear disaster
应用推荐