Havent been on this thread (or even on FR) for a little while because I have been traveling with my job. I noticed the interest in KI pills, and figured I would chime in because I have experience in this field of expertise. Hope you dont mind.
Potassium Iodide and Potassium Iodate only help if the weapon contains iodine elements in ots composition. If there is no Iodine, there is no need for KaI pills.
The little radalert pagers are pretty good things, but for long term exposure like you could find in a weapons type scenario, you need a dosimeter that can tell you the total accumulated dosage over time. There are several sources of dosimeters, some surplus, some new, that can fit the needs of most people if that is the concern. A radalert beeper only measures rises in radioactive activity above background levels, and doesnt do much for long term or high energy monitoring.
This is a good site for those types of items, bnut some can be expensive...beware...the watch type gamma dosimeter is pretty neat, however. You need gamma capability if you are looking for survival stuff.
http://www.laurussystems.com/ Another thing to read about is the Kearney Fallout meter. its a Cold War era radiation survey meter that can be built in your house ( I scratched my head too...but then I built one, took it to work, and it did check out)
http://www.ki4u.com/kfm.htm Just a former bubbleheads opinion...
Hope that helps