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... try the following. Go to a screen of your TV (after it was on
for an hour or so, or to your computer screen, and wipe its dirt with a wet
tissue paper. Then put the dirt in front of your GM tube and count for
about 5 minutes. Most likely you will observe at least two or three times
more counts than without the tissue. The dominant half-life, if I recall
correctly was something like 40 minutes. Then a tail with T=10 hrs or so.
: Ludwik Kowalski