Re: SBM 21 geiger tube datasheet
Mads Barnkob, Tue Jul 22 2008, 08:17PM

Here you go

Re: SBM 21 geiger tube datasheet
invader, Wed Jul 23 2008, 09:59AM

thank you, but that link I already have, I'm searching for something with more info, charts like voltage/CPM , etc.
Does any one know the conversion of CPM to other radiation units for this tube ?

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Re: SBM 21 geiger tube datasheet
uzzors2k, Sun Aug 03 2008, 12:14PM

I looked for more info on that same tube too when I made my counter and didn't find anything else. Your best bet would be to calibrate the tube against a known source of radiation.

Re: SBM 21 geiger tube datasheet
Seoul_lasers, Sat Aug 30 2008, 03:53PM

On yahoo groups there is an EXCELLENT source of info about Geiger counters especially (these russian units) on Geiger counter enthusiasts, and CDV700 group.
GEOS (members name) is a professional at building geiger counters and know more about calibration of these.
He sells Cs137 check sources and it is pretty reasonable.

Re: SBM 21 geiger tube datasheet
invader, Mon Sept 01 2008, 11:35AM

what's the name of the yahoo group ?

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