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 2.GQ Geiger Muller Counter
 Radioactive gas mantle and storage
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14 Posts

Posted - 04/29/2019 :  17:33:24  Show Profile  Reply with Quote
It is known that some gas mantles are radioactive. I managed to found some of them, however, as I searched lately, those are doped with Thorium dioxide. The mantles are in a sealed plastic bag, and with GMC-300E+ 4.50 measures 660 to 780 average CPM. If I separate the counter, more than 2 or 3 cm, it decreases drastically.

Few doubts I have:

1. With plastic bag, filters out all alpha particles?, next
2. With same above, but now wrapped with aluminum foil, should block beta particles right?, and
3. All above plus a steel sheet of 0.8 ~ 1.0 mm, must block alpha and beta particles and only pass gamma rays?

Should I still keep them in their bags or it is needed more shielding?

I will provide photos if needed, any foreword is welcome meanwhile.
Reply #1


1163 Posts

Posted - 04/30/2019 :  10:27:34  Show Profile  Reply with Quote
1. Yes.
2. The alpha should still be blocked, but beta depends.
3. Yes.

I think you can keep them with the plastic bag but don't put them close to you or someone else.
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