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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No, you looked purely at GCR and not total dose.
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I'm talking about GCR because that is the radiation type we don't have good data on.
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Except we do. We have years of data on it. Low energy GCR is most similar to the trapped radiation ISS. So AGAIN, you have to use Sieverts which already adjusts for the different effects, not cherry-picking just GCR.
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We don't have the data on what deep-space GCR does to humans, because we have never gone there and there is not such an environment on Earth. GCR flux in deep space includes heavy nuclei whose cumulative effect on eyes, bone, etc. is conjectural. You can't handwave that away.
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Replying to @Pinboard @Robotbeat and
We've put mice in front of a particle beam; that's about the extent of what we know about the biological impact of heavy ion radiation.
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Did you somehow forget ISS again? The heavy ion high energy GCRs are not deflected by the magnetosphere and impact ISS the same as in deep space minus some shielding from Earth itself (which lowers the dose rate but doesn’t eliminate it).
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Replying to @Robotbeat @Pinboard and
Yup, it's the atmosphere that (partially) protects us from those.
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Big fan of the atmosphere personally
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