Re: Light Sensitive GM Tube -Reply

[don@radpro.uchicago.edu]

I believe that the outside of the window is coated with graphite.  This may 
have flaked off, leaving a window for UV to enter the tube.  The graphite 
coating can possibly be repaired using a substance called "Aquadag", which 
is a colloidial suspension of graphite in water -  with a little ammonia 
for stability.   I have not tried this, so I can't promise success.  Mr. 
Frame is probably right in his suggestion to replace the tube.

___________________________________________________________________

Don Jordan                          Tel. (312) 702-6299
Office of Radiation Safety          Fax        702-4008
The University of Chicago           email: don@radpro.uchicago.edu
1101 East 57th Street, Room 11
Chicago, Illinois  60637  
                -- Any opinions are the author's --