The normal method isn't terribly adequate AFAIK, at least for the weight. The ISS crew has a pretty substantial increased cancer risk, and they're still partially protected by Earth's magnetic field.
Over a long term interplanetary voyage, the chances of cancers developing would probably approach 100%.
I think the idea is, you're going to have to carry all that water to Mars anyway, and it just happens to be the best form of shielding around.
Over a long term interplanetary voyage, the chances of cancers developing would probably approach 100%.
I think the idea is, you're going to have to carry all that water to Mars anyway, and it just happens to be the best form of shielding around.