Barry wrote:
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?


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

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

The thing about these is that the glass is designed to block lower energy
radiation. Still, if you want to detect background gamma radiation, it's
not bad. It's probably okay for beta radiation too although you don't know
until you test it.

The market is glutted with Victoreen survey meters. Millions of them were
made for the civil defense folks in the fifties and sixties, and they are
all on the surplus market. They also don't respond well to lower energy
particles, and the scale calibration is useless because the integrator stage
is intended for use in very high radiation environments, but they are very
cheap.
--scott


--
"C'est un Nagra. C'est suisse, et tres, tres precis."