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 2.GQ Geiger Muller Counter
 Calibration intervals
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6 Posts

Posted - 09/05/2023 :  00:14:02  Show Profile  Reply with Quote
Iíve been running the GCM-500+ continuously 24/7 for about 10 months now. It was set up to measure ambient radiation and is logging datapoints every 2 minutes. Iíve noticed that for the first 7 months or so, I never saw any reading above 50 CPM. Now after 8 months Iím seeing 50CPM+ readings two or three times a day.

Iím wondering how frequently these things needs to be recalibrated?
Reply #1


1110 Posts

Posted - 09/05/2023 :  03:03:23  Show Profile  Reply with Quote
"Calibration" is of no help; it is only the introduction of a factor to convert from CPM to microSievert/h.

It looks like hardware defect. Try different USB-cable, check battery, check anode voltage.
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Reply #2


2148 Posts

Posted - 09/06/2023 :  10:48:06  Show Profile  Reply with Quote
Try to do a factory reset. Check if the 50+ CPM is consistent even in different areas.
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