I went to visit my son this weekend at college and he took me on a tour of the nuclear research facility that he used to work at (yes they have students running a nuclear reactor - not to worry - it's small and I think I would trust Reed students more than most people out there doing the job). One of the exhibits they had was a Geiger counter next to some fiesta ware. It was turned off at the time but I was told that it ticks its little heart out when on. :)
Donna