Mars-bound pioneers will be exposed to radiation levels that could effectively retire astronauts under NASA's current standards, scientists reported Thursday.

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They added that the findings raise serious questions about the levels of radiation people can be exposed to at work.

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That is because about a quarter of these people would be expected to die from cancer even had they not been exposed to Chernobyl's radiation.

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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.

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