I thought you all might find this amusing. I while back there was a thread 
about tubes with radon in them. That set me off on a little side-quest where I 
ended building a Geiger counter using an old Russian Geiger-mueller tube. It 
has never detected anything but background levels.

I also buy other vintage stuff, and my wife just asked me to check one of them 
for radioactivity, because she said “it looks like it glows”. It had never 
occurred to me. Anyhow, here is the result:

https://youtu.be/PMrHIyntT4s

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