Quote Originally Posted by NA4BH View Post
Keep the keychain down near the "OL, Knewt Rockne's".
I checked the tritium key chain fob against my Geiger counter. Held 1 inch from the Geiger tube I got normal background radiation levels. Placed directly on the Geiger tube I got normal background levels. In other words the beta particles emitted by the tritium lack the energy to make it outside of the sealed fob. So I would deem it very safe to carry. Even down there.