The career dose limit for 30-to-60-year-old male astronauts who never smoked ranges from 800 to 1, 200 millisieverts.

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As for the 5m people who still live in contaminated areas, most have exposures to radiation that remain within the recommended dose limit.

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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.

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If you received that Defkalion dose for one hour, you would be approximately at the U.S. limit on effective dose from a single airport security screening.

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The Food and Drug Administration instituted the new limit on the top 80-milligram dose of Zocor, generically known as simvastatin because that dose has been associated with an elevated risk of muscle injury, which can lead to potentially dangerous consequences.

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Dr. JOSHUA OFMAN (Vice President, Amgen): The FDA label acknowledges that a certain risks cannot be excluded, but they have clearly stated that the lowest dose should be use to avoid transfusion with an upper safety limit of 12, leaving some discretion for physicians to make those determinations based on their individual patient needs.

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