Geiger Tubes - Geiger Müller Counters

I'm also looking forward to do experiments with "ordinary" off-the-shelf GM tubes.
The principle is the same - 2 tubes connected to the coincidence detector. One disadvantage might be the much smaller area of the tube, so one is counting less muons, but at least you don't have to build the detectors yourself.

UPDATE 19-JUN-2004:

I got the geiger müller tubes this week and today I tried one tube at first. I hooked up a CK1026 and later a CK1049 - with the new coincidence circuit designed by Joseph DiVerdi of xtrsystems.com and I saw very nice background radiation. I verified the correct function of my setup with 3 uranium glass marbles placed directly beside the tube and as expected the radiation count rate increased.

So I went ahead and connected a second tube of the same type (CK1049). After increasing the high voltage to about 900V the LED for each tube started to flash randomly, but sometimes the MUON LED flashed! Pretty cool!!! :-D

A few words to the Raytheon tubes: The pin (on the left side in the image above) is the connection to the high voltage and the gaphite-colored belt goes to ground or in our case to the resistor of the coincidence circuit.

More to come...

Be very careful when handling high voltages!
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