Hard to say, since that's in grays instead of sieverts. The two can give very different curves. >again very little GCR reaches the surface On Venus there woul

Hard to say, since that's in grays instead of sieverts. The two can give very different curves. >again very little GCR reaches the surface On Venus there would be less shielding than on the surface of the Earth. The minimum acceptable altitude is ultimately limited by temperature, not pressure or radiation.