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.
How is that calling ISS data invalid? This is the most confusing argument I've had on Twitter in a while.
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Speaking bluntly, historically dozens of astronauts have died due to "human factors" and none from radiation. Not even any radiation-involved illness. The worst case scenario for radiation on a trip to Mars is that the mass carve out for shielding needs to be a bit bigger.
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I don't lose sleep worrying about conjectured interactions of GCRs and bone-decalcification, as though osteocytes know or care about this. I lose sleep worrying about mechanical design decisions getting screwed up by non-technical middle management structures.
End of conversation
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