[Slick]

I don't know the radiation levels exactly, but, yes, there are some lethal areas between Earth and Mars. The current idea is that there would be a small shielded compartment in the ship where the crew would go when passing through these areas. A small shielded (probably Pb) compartment is much more practical than shielding the entire ship. If required, the crew could safely make short excursions out of the shielded room to operate equipment, etc.

Slick.