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Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
hv-friekie wrote ...
yep, exactly.
My, oh my, never a day goes by when we don't learn something new here!
I'd always thought that voltage regulation was needed to hold the anode voltage midway along the GM plateau, so that small changes in voltage would not result in a significant change of sensitivity.
Registered Member #2273
Joined: Thu Aug 06 2009, 07:02PM
Location:
Posts: 37
I guess i am understanding something wrong, your post sounds ironic, or wasn't it?
You need the voltage regulation because without it the boostconverter would output a theoretical unlimited high voltage which would cause the tube to spark over or even damage it.
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
hv-friekie wrote ...
I guess i am understanding something wrong, your post sounds ironic, or wasn't it?
You need the voltage regulation because without it the boostconverter would output a theoretical unlimited high voltage which would cause the tube to spark over or even damage it.
Registered Member #2273
Joined: Thu Aug 06 2009, 07:02PM
Location:
Posts: 37
@Proud Mary: Your statements help nobody. Also, i still don't understand if you mean that in an ironic way. It just sounds if i said ''i am going to build a neclear power plant'' and you will say ''You must do what you think is best''.
Registered Member #27
Joined: Fri Feb 03 2006, 02:20AM
Location: Hyperborea
Posts: 2058
This part is ironic: My, oh my, never a day goes by when we don't learn something new here!
This part explains why you need voltage regulation: I'd always thought that voltage regulation was needed to hold the anode voltage midway along the GM plateau, so that small changes in voltage would not result in a significant change of sensitivity.
Registered Member #3859
Joined: Sun May 01 2011, 03:47PM
Location:
Posts: 179
What sensitivity is there to a Geiger counter? I am confused.
A Geiger-Muller tube receives a radioactive ionization particle and sparks over or it doesn't receive an ionization particle and it doesn't spark over. That is why it is a counter. Tertium nоn datur.
Is there a sensitivity of the Geiger-Muller tube? Some are made for alpha, betta and gamma, while others are made just for gamma. Right?
Registered Member #543
Joined: Tue Feb 20 2007, 04:26PM
Location: UK
Posts: 4992
In the example above, it would be good practice to use a regulator to hold the anode voltage to 1200 V, in the middle of the GM plateau.
In this position, quite large voltage excursions can be tolerated without significantly altering the number of ion pairs produced.
In an ideal GM tube, the GM plateau would be completely level, but in practice there is always a slight inclination, known as the slope, which changes (usually slowly) over the life of the tube.
Slope is an important datasheet parameter, and is the percentage change of count rate for each 100 V change of anode voltage on the GM plateau.
Tubes with a slope greater than about 10% should be put in the dustbin.
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Geigercounter problem
