MuonNeutrino: mamoru: The Beatings Will Continue Until Morale Improves: The best strategy I heard was to line the inside of the pressure hull with the ship's water tanks since water tends to absorb radiation quite well.Water is heavy and rather dense (1 ton per cubic meter). That will significantly add to the mass of any ship, further increasing fuel requirements, further increasing the amount of mass you need to move. If water is your fuel, then you run into the problem of decreasing your shielding by using it.I'd guess a lighter solution would be much more preferable. Just out of curiosity, anyone know how thick a layer of water you would need to shield those on board from radiation hazards in space?I think the idea was simply to design the craft such that the water you'd be bringing along anyway would be placed in locations where it'd help to shield the crew. That said, wikipedia suggests that you need 18 cm of water just to cut gamma ray intensity by half, which is a lot. I'm not sure what the figure is for shielding against energetic protons, but if it's comparable, you're going to need a heck of a lot of water for protection. Even just shielding a 4 meter by 10 meter cylinder is about 29 cubic meters of water AKA 29 metric tons. That's a lot of mass to try and launch.
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