guys - I found an article that describes 3 different ways to determine the helium pressure inside the counter!
I have the pdf of the original in Russian, but I also found an English version, however, I do not have access to the text to compare it with the original.
the English version is here - https://doi.org/10.1134/S0020441220010236
original - https://sciencejournals.ru/view-article ... silev#text
https://sciencejournals.ru/cgi/getPDF.p ... asilev.pdf
p.s.
since i really love x-rays, i decided to image this counter at 50 and 100 kev - will post the pictures here : )
Is this neutron counter dead?
- Michael Kaufmann
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- Dennis P Brown
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- Real name: Dennis Brown
Re: Is this neutron counter dead?
Thanks for the post on the detector parameters.
Just remember, X-rays don't love you! Proper shielding and detectors to determine exposure is critical for one's long term health - safety matters.
Just remember, X-rays don't love you! Proper shielding and detectors to determine exposure is critical for one's long term health - safety matters.
- Michael Kaufmann
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Re: Is this neutron counter dead?
heh - nothing really fancy there:
and i don't see anode wire - probably coz it's just too tiny. or coz the focus of the x-ray tube is too large.
and i don't see anode wire - probably coz it's just too tiny. or coz the focus of the x-ray tube is too large.
- Michael Kaufmann
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Re: Is this neutron counter dead?
it's there : )
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Re: Is this neutron counter dead?
Well that is some next level investigation right there…
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- Real name: Peter Schmelcher
Re: Is this neutron counter dead?
Your operating voltage seems high to me. I tested a CH19N and determined it was working by ramping the voltage up in steps and measuring the resulting pulse heights (Geiger plateau curve). Pulse height is the gain of the detection process and increases with voltage.
From my memory I believe the best signal to noise was around 1200 +-75V for proportional operation. The manufacturer recommended voltage was 1875V to 2100V for Geiger operation but honestly it was unusable at that voltage.
At higher tube operating voltages the circuit you are using becomes an avalanche oscillator.
Cheers -Peter
From my memory I believe the best signal to noise was around 1200 +-75V for proportional operation. The manufacturer recommended voltage was 1875V to 2100V for Geiger operation but honestly it was unusable at that voltage.
At higher tube operating voltages the circuit you are using becomes an avalanche oscillator.
Cheers -Peter