Gas filling of Geiger tube
Posted: Tue Feb 27, 2018 10:13 am
Hi all,
I got from my sypplier a badly crushed soviet CTC6 GM tube. As it was unusable, I opened it up to see how it is made inside.
The attached picture shows the whole interior of it.
The inspection reveals that the gas contained into the tube may stays there provided a sealed chamber is formed by a tight crimping of tube at the end caps.
Together with the crushed tube I received more undamaged CTC-6 and SBM-19 tubes. A couple of them however have one or both caps that are not firmly crimped, thus they can be moved by twisting them a little bit by hand.
This fact led me to conclude that the gas of those tubes has leaked out through minute tube-caps fissures, as there is no other sealing, thus making those tubes unusable.
However, when I tested them, they resulted working pretty well, in contrast to what I expected.
Do you have any explanation for that odd behaviour? Maybe the gas has not completely leaked out and some of it still stays inside the tubes? Or what?
Thank you
Antonio Zanardo
I got from my sypplier a badly crushed soviet CTC6 GM tube. As it was unusable, I opened it up to see how it is made inside.
The attached picture shows the whole interior of it.
The inspection reveals that the gas contained into the tube may stays there provided a sealed chamber is formed by a tight crimping of tube at the end caps.
Together with the crushed tube I received more undamaged CTC-6 and SBM-19 tubes. A couple of them however have one or both caps that are not firmly crimped, thus they can be moved by twisting them a little bit by hand.
This fact led me to conclude that the gas of those tubes has leaked out through minute tube-caps fissures, as there is no other sealing, thus making those tubes unusable.
However, when I tested them, they resulted working pretty well, in contrast to what I expected.
Do you have any explanation for that odd behaviour? Maybe the gas has not completely leaked out and some of it still stays inside the tubes? Or what?
Thank you
Antonio Zanardo