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View Diary: Dennis Tito Promises Manned Mars Mission in 5 Years (60 comments)

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  •  There's something called "halving thickness" (8+ / 0-)

    for each material, and it's the thickness that halves the amount of radiation passing through it.  Add twice that thickness and it cuts radiation down to 1/4.  Three times, 1/8.  And so on.  The halving thickness of lead is 1 cm, so shielding for the normal interplanetary space environment (other than solar flares and CMEs) would be a few centimeters.  And you don't need to protect the entire crew habitat all the time with enough shielding to totally block out radiation, just have a shelter for extreme radiation events and put a thinner amount around the rest of the hab.  

    Also, you don't have to use lead - you can just keep the craft oriented so the fuel tanks are always between the habitat and the Sun, and then you only need to shield for cosmic rays.

    Some things you just can't unsmell.

    by Troubadour on Wed Feb 20, 2013 at 06:30:11 PM PST

    [ Parent ]

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