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 2.GQ Geiger Muller Counter
 Tube voltage
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6 Posts

Posted - 10/14/2023 :  05:24:59  Show Profile  Reply with Quote
Hello everyone,

I recently got a GMC 600+ and it's a cool device. I've been researching it and one thing i don't understand. What happens if you change tube voltage? Does it detect better or worse?

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1118 Posts

Posted - 10/15/2023 :  03:01:57  Show Profile  Reply with Quote
Read about the "Geiger Plateau", e.g here:

Beyond the left of the left end you may not get any counts at all. Beyond the right of the right end you may destroy your tube (it turns into a 'fluorescent lighting tube').

Increasing voltage within the plateau region increases the count rate slightly. One should select a voltage near the middle of the plateau. But it is not very critical (within the plateau region).
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