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 2.GQ Geiger Muller Counter
 GQ GMC-800 Beta Sensitivity		  New Topic  Reply to Topic
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Sajuuk Khar

Canada
1 Posts
Posted - 03/12/2025 :  07:36:08  Show Profile  Reply with Quote
Hello,

I had a GQ GMC300S and recently purchased the 800 as an upgrade. I cant find any details on the Tube if its better than the 300S, but I am concerned that the Beta Sensitivity will be even less than the 300S because there are no vents around the tube to the outside.

Have most found this is the case with this unit?
Reply #1

EmfDev

2313 Posts
Posted - 03/12/2025 :  13:14:32  Show Profile  Reply with Quote
the tubes are the same and the vent should not have that much effect.
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Reply #2

ullix

Germany
1189 Posts
Posted - 03/25/2025 :  00:43:19  Show Profile  Reply with Quote
The GMC-800 compared to the 300 has a sturdier case (i.e. thicker plastic), which is a good thing, and also no holes.Also good, because it does mitigate the undesirable effect of light on the Geiger tube.

This has (almost) no impact on Gamma sensitivity, even for that lowest Gamma-Energy radiation which its Geiger tube is able to detect.

However, it does have a very significant impact on beta radiation. See this other post with an almost identical topic:
https://www.gqelectronicsllc.com/forum/topic.asp?TOPIC_ID=10791
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