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 2.GQ Geiger Muller Counter
 GMC-320 measuring uranium glazed pottery
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Petrovski

Netherlands
16 Posts

Posted - 02/05/2019 :  12:19:36  Show Profile  Reply with Quote
Bought some uranium glazed pottery (Fiestaware) from eBay for about 10 GBP. Measured it at my work with a professional pan-cake survey meter,
the Saphymo Minitrace S5. The minitrace measures ~70uSh/h. Note: not energy compensated and calibrated on a Cs-137 source.

My personal GMC-320 Plus measured around ~13uSv/h, after stabilizing around 2000CPM after a few minutes.
Not bad, given the difference in detection area (pancake GM with a foil that detects alpha, beta & gamma versus a tube GM
which can only detect some beta and mostly gamma) and price difference. :-)






Edited by - Petrovski on 02/05/2019 12:26:59
Reply #1

EmfDev

642 Posts

Posted - 02/05/2019 :  12:50:17  Show Profile  Reply with Quote
What is the CPM with the Saphymo Minitrace S5?
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Reply #2

Petrovski

Netherlands
16 Posts

Posted - 02/05/2019 :  12:51:29  Show Profile  Reply with Quote
quote:
Originally posted by EmfDev

What is the CPM with the Saphymo Minitrace S5?



Good question. I looked through the device's menu but could not find a CPM mode. I'll check the instruction manual tomorrow.
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Reply #3

EmfDev

642 Posts

Posted - 02/05/2019 :  15:43:18  Show Profile  Reply with Quote
If that's using a pancake and more expensive, it should have higher CPM than the 320, otherwise, you can just display any number.
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