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2.GQ Geiger Muller Counter

Source of 0.8 uCi

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mimichris

France
18 Posts

Posted - 11/28/2022 : 02:56:18

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
1107 Posts

Posted - 11/28/2022 : 03:06:14

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

Reply #2

mimichris

France
18 Posts

Posted - 11/28/2022 : 07:50:05

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.