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 2.GQ Geiger Muller Counter
 Source of 0.8 uCi		  New Topic  Reply to Topic
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mimichris

France
18 Posts
Posted - 11/28/2022 :  02:56:18  Show Profile  Reply with Quote
I have a source of 0.8 uCi which comes from a smoke detector, I do not know its accuracy, but I only have this, how far can this source from the Geiger tube be placed to have a reliable measurement?
I also have a piece of natural U238 and a radium source also from a smoke detector but I don't know its value.
Thanks.
Maxime
Edited by - mimichris on 11/28/2022 02:56:44
Reply #1

ullix

Germany
1171 Posts
Posted - 11/28/2022 :  03:06:14  Show Profile  Reply with Quote
Try it out, nothing can go wrong.

Except: if these appear dusty, or pieces may come off, put them in a plastic bag. I would not want to have any alpha emiiter around me, which I could breath in!

With the GMC-500 you could not detect alpha anyway, and enough betas will pass. Gammas will almost not be weakened at all.
Edited by - ullix on 11/28/2022 03:08:19
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Reply #2

mimichris

France
18 Posts
Posted - 11/28/2022 :  07:50:05  Show Profile  Reply with Quote
with a RHElectronics ver 2.15 Geiger counter and an SBM20 tube at 13mm from the tube: 1.44uSv/h and 256 CPM.

with another Chinese CG-01 Geiger counter tube J321 at 13mm from the tube: 1.70 uSv/h and 240 CPM.

With a RHElectronics ver 1.2 Geiger counter with a tube J305 at 13mm from the tube: 1.70uSv/h and 214 CPM.
Maxime
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