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 2.GQ Geiger Muller Counter
 GMC-500+ vs GMC-600
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ceandre27

9 Posts

Posted - 02/07/2018 :  06:46:22  Show Profile  Reply with Quote
Hi ppl!

I just got my GMC-600, and I'm running some tests on them both sametime.
Then, I just noticed something weird on CPM / uSv/h.

On GMC-500+ (M4011 + SI-3BG tubes) I got:
uSv/h: 0.15
1427 CPM after 1 hour

On GMC-600 (SBT-11 pancake) I got:
uSv/h: 0.09
1755 CPM after 1 hour

I know, SBT-11 is more sensitive, but WHY I got lower uSv/h even with MORE CPM ??


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Edited by - ceandre27 on 02/07/2018 06:48:22
Reply #1

marzio

Italy
4 Posts

Posted - 02/07/2018 :  11:30:37  Show Profile  Reply with Quote
i hope that this image can help you.
GMC-600+ (LND7317)
your GMC-600 is wrapped in nylon
may it lose sensitivity compared to the GMC-500?


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Marcus
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Reply #2

ceandre27

9 Posts

Posted - 02/07/2018 :  14:13:47  Show Profile  Reply with Quote
Hi Marzio!

I open a hole on plastic film at sensor window :)

What I think weird it's ratio CPM x uSv/h, from one unit to another. 600 unit got MORE CPM than, but it's counting LESS on uSv/h unit.

Both turned on same time, side by side. I know which 600 must get more CPM because it's more sensitive, but what intrigues me is the lower uSv / h value

Carlos
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Reply #3

marzio

Italy
4 Posts

Posted - 02/07/2018 :  14:41:22  Show Profile  Reply with Quote
hi Carlos,
have you modify the 'calibrate' menu?
the relation among CPM and uS/h can be changed in base of the sensibility of the tube.
if you have changed the relation then try to execute a 'factory reset'.
ciao, marzio

Marcus
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Reply #4

ceandre27

9 Posts

Posted - 02/07/2018 :  18:53:21  Show Profile  Reply with Quote
Hi Marcus,

No, I not changed anything on calibrate menu :|

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Reply #5

ZLM

1194 Posts

Posted - 02/07/2018 :  22:03:54  Show Profile  Reply with Quote
ceandre27, each tube has slight different conversion rate. In your case, you can adjust the conversion rate. Go to Init menu and then select Calibration 1, change 300 to 230.
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