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Re: Light Sensitive GM Tube



 >>>>    Any thoughts as to the cause of the phenomenon.   <<<<

Just a thought:

The UV rays produced inside G-M tubes (following ionization and gas
multiplication events) are leading to the counter's complete discharge;
thus, if you have a breach in light-tightness, the tube will produce counts
when exposed to external UV.   

Regards,

  Miroslav

  ************************************************************
  Miroslav Lieskovsky                Health Physics Department
  Health Physicist                           Point Lepreau G.S.
  e-mail bus: mirolies@nbnet.nb.ca         New Brunswick Power           
  Phone  bus: (506) 659 7421                       P.O. BOX 10      
  Fax    bus: (506) 659 2003                      Lepreau, N.B.
  e-mail res: miroslav@mi.net                  Canada, E0G 2H0
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  PS. Standard disclaimers apply...(also to expressed opinions).