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I also looking at Spectra of the background.. Im seeing small, but consistant, deviations from the expected 1/f spectrum.

I can't find any information on the spectrum of background..

If this forum is the wrong place for this post, just delete the thread. This forum seems to be the best place to discuss geiger counter engineering so I am going to post here with some observations and questions if its OK. I am a electronic engineer with tons of analog engineering experience. As a f...