| T O P I C R E V I E W |
| Tony |
Posted - 04/06/2025 : 23:06:34
Hi, I bought a GMC-800 a few weeks ago, I'm an enthusiast, so I read something about it, now I have some questions to ask and I hope you can help me understand: my GMC 800 mounts a J321BY tube, now the first question I ask is; what is the difference between M4011, J321 without the BY and if I can mount a Russian SMB-20 tube on the 800 since the casing is not glass it should work well then on the 800 also by drilling some holes since it is not glass so I suppose it is not sensitive to light like the J321, I read some comments on the 321J tubes that do not work well, now I do not understand these differences between M4011 \ J321 \ J321BY are they the same thing or not? can you mount a SMB-20 perhaps with some modifications since it is longer by removing the side caps? and can you also mount a J305BY tube on the 800? A thousand thanks |
| 11 L A T E S T R E P L I E S (Newest First) |
| Tony |
Posted - 04/15/2025 : 10:53:54
is the operating system of the chromebook chromeos? should i install linux then |
| Tony |
Posted - 04/15/2025 : 10:49:18
sorry, i don't understand well, does it work on chromebook or not can i use geigerlog on my chromebook? |
| ullix |
Posted - 04/14/2025 : 23:15:59
quote:
to do all this you need a windows operating system,
Where did you get that from?
Even an only very cursory look at at the web or into the manual would have told you that GeigerLog is based on Python, and so it runs wherever Python runs.
This means it runs on Linux, Windows, Mac, BSD, and others. As Chrombook is based on Linux, you can't help - it also runs Python!
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| Tony |
Posted - 04/14/2025 : 04:22:08
yes I understand but to do all this you need a windows operating system, I don't have it, the system I have is chromebook |
| ullix |
Posted - 04/12/2025 : 23:19:44
GeigerLog is my software, supporting Geiger counters and various other, data-logging devices. Its latest version is even supporting Gamma-Spectra from a multitude of Gamma sensors. It is free, open source, and is hosted on SourceForge:
https://sourceforge.net/projects/geigerlog/
Since you are not familiar with it, I suggest a look into its manual:
https://sourceforge.net/projects/geigerlog/files/GeigerLog-Manual-v1.5.0.pdf/download
If you are new to the Geiger field, a reading of my "Potty Training", like a 101 on Geigers, might be helpful.
https://sourceforge.net/projects/geigerlog/files/Articles/
GeigerLog includes some tools for Quality Checking of your recordings. The most important one is the "Poisson Test". To my knowledge, this is not available anywhere else.
The count events of any random counts over time, being cars on an intersection, customers in an icecreak parlor, whales in a bay, or Counts of a Geiger counter follow a Poisson distribution. And if they don't, something is wrong. More on Poisson in both the manual and the Potty Training.
As an example a recording of mine from yesterday.
The upper left picture shows the time course of CPM from a GMC-300 counter. The backside was removed, and the "naked" tube was exposed to ambient light. The yellowish line is a Moving Average. You can probably already tell when the sun was shining brightly, and when the sky was cloud covered. (Yes, all glass tubes are light sensitive!).
The upper right picture shows the resulting Poisson curve. Clearly distorted!
The bottom two pictures show the very same setup, but now the counter is sitting in a dark box; no light is reaching it. And the Poisson curve is near perfect!
Similar distortions can be observed when the electric pulses resulting from a count are quenched due to improper wiring of anode wires and anode resistor. The time course will NOT show it; but Poisson will!
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| Tony |
Posted - 04/12/2025 : 05:50:23
sorry why is it geigerlog, the poisson geiger log button? I don't understand |
| ullix |
Posted - 04/12/2025 : 04:39:20
I see you really are serious! But before you go the distance, I suggest something simpler.
Just connect some wires to the tube clips inside, and lead the wires to outside, where you connect the new tube, like the SBM20.
These wires should be as short as possible. Because long wires would increase the capacitance of this setup, and this might well result in a distorted count collection.
You can easily test whether your setup is suited to the task: Run the GMC counter at GeigerLog to collect a good chunk of data (like overnight). Then click the Poisson button of GeigerLog, and you will immediately see whether anything is distorted or proper.
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| Tony |
Posted - 04/11/2025 : 02:33:51
thanks I take note of itI will try to install a SBM-20 on GMC 800...I saw this video on youtube to shorten the tube and insert it into the 800
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| ullix |
Posted - 04/09/2025 : 23:38:56
All of those cheap Chinese glass tubes, and all of the extended SBM20 family are electrically compatible with the GMC-800. In addition, even those expensive Pancake tubes, like built into the GMC-600, can be used.
Fitting them mechanically, hoever, is not so trivial.
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| Tony |
Posted - 04/09/2025 : 10:14:00
Thanks, when asked if someone tried to install an SBM-20 tube on GMC-800? |
| EmfDev |
Posted - 04/07/2025 : 13:17:48
BY probably just means beta / gamma so they should be the same
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