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By the way, radiation from coronal mass ejections and associated solar particle events (SPEs) is much easier to shield than radiation from galactic cosmic rays (GCRs are the primary concern for long-term astronaut exposure on Mars). Even the thin skin of the spacecraft is enough to reduce the SPE dosage to non-acutely-lethal levels, and rearranging the provisions (food and water) around a central location is sufficient to reduce the dosage due to solar particle events to a manageable level.

On board ISS, the crew return vehicles are not for ditching due to an SPE. Such radiation events travel fast enough that you'd likely be stuck in the crew return vehicle when it hit. The Station itself provides much better shielding from such events, and ditching in a hurry (landing somewhere random in the ocean) would be much more dangerous than sheltering in place.



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