I’m sure you’ll ignore this, but: For a transit time of 3-4 months, that’s a solved problem. The Russians had a >400 day mission and the dude who did it walked after landing on Earth. That’s 3 times the gravity of Mars and 4 times the duration of Mars transit on Starship.
You have this wrong; GCR radiation dose is four times as intense on a trip to Mars as it is over an equivalent period on ISS, and includes cosmic rays at lower energies that don't reach LEO.
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Right. And ISS includes a bunch of trapped radiation from the lower part of the Van Allen belts (the South Atlantic Anomaly) which isn’t present in deep space. To account for different effects on tissue, we adjust by the Quality Factor. That’s already included in the Sievert unit
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And the Mars transit exposure for this radiation in Sieverts, with all fudge factors applied, is over four times that of ISS
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