Lt CHEG, I'd agree that avoiding breathing the stuff into the lungs would be the highest priority. The DHS document recommended breathing through a cloth while there was airborn rads.
From your comments, I wondered if you had a nuclear background. I was impressed by the civilian Navy nukes; they seemed to only take the brightest of the bright.
I got out of the Navy after almost 7 years in 1991 when the 1st Gulf War started. I did my nuke training in Orlando and Hartfort, CT. I was stationed on subs in Groton, CT and Charleston, SC. I interviewed with Admiral McKee when I was in college before being accepted into the nuke program. If I had interviewed one year earlier, I would have had to interview with Admiral Rickover (known as "The Father of the Nuclear Navy"). I have talked with people who interviewed with Rickover; there are some interesting stories. One guy went to his interview and Rickover told him that the guy wasn't ready yet to interview with Rickover and made him wait in a closet with the door shut for 2 hours. I knew a guy in college who interviewed with Rickover the year before my interview. He did not get accepted into the program. His interview with Rickover was so traumatic that he would not talk about it. I have no idea what happened.