Looks like they lost the formula for that magic gold foil, that they used for the Moon Missions.
This article casts doubt on the ability to send humans to Mars because of the radiation. The problem is that the article ignores the problem of
particles thrown off of molecules when struck by Beta and Gama radiation. It is not the radiation which is the problem, you can block most of that
with a few inches of earth. The particle storm from the rays striking the shield shreds the human body. It takes about 12 feet of earth to absorb the
cascade effect of the particle storm.
science.nasa.gov...
Being in a capsule will not protect you from Beta and Gama radiation. Alpha is stopped by a piece of paper.
The shielding to stop Beta and Gama causes a cascade effect of particles being torn from the shielding, which shred the cells of the body.
NASA never explained how they got around this problem for Apollo.
If you doubt the truth of this, ask yourself: How much shielding does it take for a nuclear reactor? How deep does a bomb shelter need to be to
protect from radiation?
The amount of earth shielding in different references varies, but I recall reading many years ago, that 12 feet were required in space.
www.captaindaves.com...
Four feet of earth is considered the minimum amount of shielding you should have if you are in a hot fallout zone. More shielding is, of course,
better. You should expect to stay in the shelter a minimum of two weeks and plan on sleeping in it for longer. Again, the longer you are prepared to
stay in the shelter, the safer you will be.