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 High CPM with SBT-11A
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U-238

USA
17 Posts

Posted - 01/11/2017 :  20:20:54  Show Profile  Reply with Quote
Hi, I got my sbt-11a a couple weeks ago, finished installation and it worked fine. I go to test it today and it reads 3k cpm with no radioactive sources nearby. I had is sitting in my garage for a while. Is it possible the freezing temperatures break it? When I shake the tube it sounds like there is something broken inwside it. But I heard this when I first got it.

Victor
Reply #1

ZLM

1046 Posts

Posted - 01/11/2017 :  20:56:40  Show Profile  Reply with Quote
It could be the tube problem. You need to make sure the tube voltage is correct. If the voltage exceeded the upper limit of the tube. It may damage the tube.
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Reply #2

U-238

USA
17 Posts

Posted - 01/12/2017 :  07:15:27  Show Profile  Reply with Quote
okay thank you

Victor
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Reply #3

Distelzombie

Germany
163 Posts

Posted - 01/13/2017 :  08:12:20  Show Profile  Reply with Quote
My sbt11a does not make any rattling sounds when shaken. You should probably return it.

GMC-300E+ V4.20 with sbt-11 alpha tube

My statements are to be taken as stuff-a-hobbyist-says.
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