Preliminary measurements of space radiation at Mars suggest that astronauts who travel there could face exposure to doses that over the course of a three-year mission would approach the lifetime safety limits set by NASA.
While the radiation appears to be manageable, an official said a network of radiation sensors in the inner solar system will be needed to warn Mars astronauts of impending space storms so that they can take cover.
Radiation levels were monitored over the past year by NASA's Odyssey spacecraft and projected to a three-year period, roughly how long a crewed mission to the Red Planet might last.
Do to the orbital cycles of both Earth and Mars a three-year mission would be the only possibility. Learning to deal with consequences of radiation is one important step in making Mars travel safe.
http://www.space.com/missionlaunches/odyssey_radiation_030313.html
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