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 2.GQ Geiger Muller Counter
 Does direct sunlight really affect readings?
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StevenL

Canada
43 Posts

Posted - 04/02/2022 :  14:02:26  Show Profile  Reply with Quote
Hello, I just received a new GMC-500+, I love it.

I have mine installed in a window, and at the end of the day it gets maybe one hour of direct sunlight, albeit behind a glass window.

I read in the manual you should avoid taking readings in direct sunlight.

Can ayone confirm what effect it might have?

Thanks, Steven Lightfoot

Steven Lightfoot, Eng.
Ottawa, Ontario, Canada
Reply #1

ullix

Germany
775 Posts

Posted - 04/02/2022 :  23:31:31  Show Profile  Reply with Quote
There are plenty of reports in this forum on light - from sun, LED, ... - creating counts in GMC's counters, search for it.

You can generally find out by shining a white LED onto the inner ends of the rod in the tube.

The strange thing is that some tubes are not sensitive at all, while at least in one case even a blackened tube was sensitive! I have now seen photos from new counters showing the tube looking like wrapped into some kind of black-paper, obviuosly to avoid the light impact. How does your tube look?

However, even if your tube turns out to be not sensitive, it is not a good idea to mount the counter at a location which changes in temperature, which will happen, when the counter gets sunlight, because the count rate will also change with temperature.

It is also not necessary to mount the counter at the window pane, perhaps you are expecting a higher count rate? Put it on a place inside the room, perhaps away from the walls, because they may contribute due to their Potassium content.
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Reply #2

StevenL

Canada
43 Posts

Posted - 04/03/2022 :  08:30:29  Show Profile  Reply with Quote
Ullix, Thanks, that is really helpful.

I am totally new to Geiger counters and radiation (although I am an experienced mechanical engineer) so I am very keen to become proficient in these subject. You obviously have lots of experience. I will start to review posts, I just got registered, and am now trying to finalize my upload settings to the map. Steve

Steven Lightfoot, Eng.
Ottawa, Ontario, Canada
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Reply #3

ullix

Germany
775 Posts

Posted - 04/03/2022 :  23:26:34  Show Profile  Reply with Quote
For starters I suggest a round of "Potty Training" with my article "GeigerLog-Potty Training for Your Geiger Counter-v1.0.pdf", download from https://sourceforge.net/projects/geigerlog/files/Articles/
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Reply #4

StevenL

Canada
43 Posts

Posted - 04/04/2022 :  04:52:02  Show Profile  Reply with Quote
Ullix. Thank you so much. I will read for sure! I noticed in some other posts which I am slowly reading your SW does some statistical analysis also, which I really excited about, I saw a poiaaon fit to some CPM histogram, which I really want to replicate with my backgropund data. I will bein touch again after I have digested your information. This is great stuff. Steven Lightfoot

Steven Lightfoot, Eng.
Ottawa, Ontario, Canada
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Reply #5

StevenL

Canada
43 Posts

Posted - 04/05/2022 :  14:56:52  Show Profile  Reply with Quote
quote:
Originally posted by ullix

For starters I suggest a round of "Potty Training" with my article "GeigerLog-Potty Training for Your Geiger Counter-v1.0.pdf", download from https://sourceforge.net/projects/geigerlog/files/Articles/



Potty Training is a great document. Thanks. May I ask what kind of techincal background you have?

Steven Lightfoot, Eng.
Ottawa, Ontario, Canada
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Reply #6

ullix

Germany
775 Posts

Posted - 04/05/2022 :  22:29:06  Show Profile  Reply with Quote
Nuclear Physics and Cancer research
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Reply #7

StevenL

Canada
43 Posts

Posted - 04/06/2022 :  03:53:10  Show Profile  Reply with Quote
quote:
Originally posted by ullix

Nuclear Physics and Cancer research



Thanks. That explains why you really know the subject. Excellent. I will read all your documwents and have downloaded your log software. I will review it all in detail. I am an experienced mechanical engineer working in the power sector, and I have decided I want to become more radiation aware, so I am braking on a self-education process. Your information will be invaluiable. Cheers. Steven Lightfoot

Steven Lightfoot, Eng.
Ottawa, Ontario, Canada
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