Also one more note about shielding in general - at least in the Solar system, you need to work with two types of radiation regimes:
1) The roughly constant stream of radiation from the Sun & deep space. That drives your shielding baseline & the areas where people spend the most time in should be shielded. One concept I liked (in the manga/anime Planetes) was a big rotating habitat having de-spun zero-G "capsule hotel" in the inner core of the station where people would go to sleep & which provided the best shielding possible, both from radiation and possibly also orbital debris, etc.
2) Solar flares and coronal mass ejections that can release basically a cloud of bunch radiation it roughly random direction from the Sun at roughly random times (related to the cycle of solar activity). Those are short but potentially very intensive events that might effectively kill un-shielded people outside (eq. doing EVA work) and still be dangerous even with shielding of the regular type. But by these evens being quite short, you can have a small area with very heavy shielding (sometimes called a "storm shelter") where people would wait out the radiation storm in safety. This might even be the same as the "sleeping area" mentioned above.
