Re: "Now, commence NBC DECON"
A great deal of radiation control is simply getting the radioactive crap off you. The Navy technique would be quite effective against fallout. The radiation suits people wear are not to stop radiation, but to be able to quickly ditch any particles you might have picked up when you're safely out of the radioactive zone.
On cheap SF TV shows you can often see a character put on one of these suits and then safely enter a nuclear core or something. Kind of like movie lava, that only burns you if you actually touch it.