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 2.GQ Geiger Muller Counter
 GMC 800 beta sensitivity		  New Topic  Reply to Topic
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Zippotix

Poland
2 Posts
Posted - 03/12/2025 :  05:37:00  Show Profile  Reply with Quote
Hello, I just bought GMC 800 and while I'm generally happy with it I feel beta sensitivity could be higher. There are no openings in the sensor location, how is beta particle supposed to pass through? Or does it work only for high energy betas?
Tested with radium watch hand and thorium mantle
Reply #1

Zippotix

Poland
2 Posts
Posted - 03/13/2025 :  02:56:35  Show Profile  Reply with Quote
Also, I tested my tube against sunlight (cloudy day but I saw those tubes react even on cloudy day) and it doesn't increase counts. Is it possible that I've got some other tube, and not m4011?
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Reply #2

EmfDev

2306 Posts
Posted - 03/13/2025 :  13:45:45  Show Profile  Reply with Quote
do you mean that it is not sensitive to light? it is suppose to not be sensitive to light. The device should have M4011 / J321 tube.
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