Travel to Mars will be significantly different w.r.t. cosmic ray exposure: "Exposures on the ISS average 150 mSv per year, although frequent crew rotations min

Travel to Mars will be significantly different w.r.t. cosmic ray exposure: "Exposures on the ISS average 150 mSv per year, although frequent crew rotations minimize individual risk. Astronauts on Apollo and Skylab missions received on average 1.2 mSv/day and 1.4 mSv/day respectively." https://en.wikipedia.org/wiki/Health_threat_from_cosmic_rays https://en.wikipedia.org/wiki/Health_threat_from_cosmic_rays