(09-29-2015, 01:16 PM)JoeStrout Wrote: Quite a lot. I don't have the figures handy, but if you have High Frontier, you can explore this for yourself: compare radiation in LEO (which is well within the magnetosphere) to radiation in High Earth Orbit (outside the magnetosphere). It makes quite a difference.
But yeah, nine meters of water would do the trick too!
Well according to the paper below in fact it would require less water not more, 6-7 meters of water in High Earth orbit, so that would work on Mars.
After posting, I thought that non-opaque solid materials, in particular quartz glass, could be used instead of water. No potential problem of leakage.
http://www.nss.org/settlement/space/RadiationPaper.pdf