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 2.GQ Geiger Muller Counter
 GMC-600+ Reading too high for sample?
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Rightfrog

USA
2 Posts

Posted - 03/15/2021 :  12:30:12  Show Profile  Reply with Quote
I have a new GMC-600+ and recently ran it against a sample of uranium ore certified at 1109 CPM using a GCA-07W. The CPM number is "combined alpha, beta, and gamma radiation emissions". The measurement was taken at zero distance from the sample and at the highest reading spot.

Just setting my unit over the container with the lid off is giving me a CPM of over 3000 and that's a consistent number after letting it measure over 3+ minutes. If I move the sample directly in front of the tube, it reads over 16000.

I've tried setting fast estimate to 60 seconds (defaulted to dynamic) but it still reads > 3000.

The unit seems to read background levels OK. On its own, it's usually 30-40CPM.

What am I missing?
Reply #1

EmfDev

1438 Posts

Posted - 03/15/2021 :  17:55:00  Show Profile  Reply with Quote
The GCA-07W has a different tube and seems like it is less sensitive than the GMC-600+. You should compare the uSv/h or radiation rate. Those should be similar.
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Reply #2

Rightfrog

USA
2 Posts

Posted - 03/16/2021 :  02:46:02  Show Profile  Reply with Quote
Much appreciated!
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