"Barry" wrote in message
...
I know this is a very long shot, but I wondered if anyone has a
geiger-muller tube lurking anywhere?
Perhaps you may know of a supplier or have an old geiger counter that you
may wish to dispose of?

Mr G4


Not sure if you've seen these but...

http://www.goldmine-elec-products.co...?number=G17365


That one only responds to Gamma radiation, not Alpha and Beta particles. A
GM tube to detect all three has a different construction- in particular a
thin window which will pass Alpha and Beta particles which normally are
stopped quite easily.

If the Geiger counter is for private/demo use then sources will be an issue.
Alpha and Beta sources are quite common- smoke detectors use an Alpha source
(can't recall the name) and "Tritium" lights (as found in some signs,
compasses, watches etc.) are Beta sources.

I don't recall any readily available sources of Gamma radiation- although it
is used extensively in medicine.

--
73
Brian G8OSN/W8OSN
www.g8osn.net