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 2.GQ Geiger Muller Counter
 Energy response curves
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Posted - 11/11/2020 :  08:01:15  Show Profile  Reply with Quote

Does anybody know where I can find an energy response curve for the tube that is in the GMC300E-plus? I'd appreciate any direction anyone can give.

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602 Posts

Posted - 11/13/2020 :  01:14:04  Show Profile  Reply with Quote
If you ever find such a response curve, please show us! I doubt, however, that such a curve even exists.

You may have to settle for some generic curves, google for "energy response geiger tube" and select pictures. Wikipedia has a representative one (scroll down).

They all tend to show a similar pattern: low sensitivity around 1 MeV (so the prominent potassium line at 1.4MeV is poorly detected), and high sensitivity slightly below 100keV. But typical clinical x-rays also remain poorly detectable.

Keep in mind that this applies ONLY to gamma radiation! Once your source has any beta radiation, this energy response curve becomes meaningless!

By the way: the tubes in the GMC counters had been M4011, but recently some seem to have been replaced with the cheaper J305 tubes. For neither have I ever seen an energy response curve.
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