[Spaceships] Getting A Few Thousand Extra MPS

[Anthony]

Originally Posted by scc

Pretty sure that Colonies in Space said 5 feet, but it's been so long since I last read my copy I don't know where it is.

Usual estimates for getting doses below OSHA limits are about 5 tons per square meter (roughly half of Earth's atmosphere; how thick this is depends on the material), varying somewhat with composition (unlike gamma rays, cosmic ray shielding works better with light elements).

The rules for cosmic radiation PF aren't terribly accurate, but the rules for radiation PF in general are not super accurate.