Light Sensitive GM Tube -Reply

[FRAMEP@ORAU.GOV]

Ed Pombier wrote in part:

> We have a Ludlum Model 44-7 thin end window G-M detector which
>appears to have become light sensitive.
>Any thoughts as to the cause of the phenomenon.

What the heck, let me speculate on something I know very little about.

It might be pulse production due to UV interactions in the detector
cathode.  The quenching agent might finally have been depleted. This
would suggest that the tube uses an organic quench. In any event,  I'd
buy a new tube. 

Paul Frame
Professional Training Programs
ORISE
framep@orau.gov