Re: Gamma and X-ray detectors

["USHINO, TOSH" <ushinot@songs.sce.com>]

David (I hope I guessed your name correctly):

Sounds to me like you need to talk to manufacturers of detector crystals and 
plastics.  End-users like me wouldn't have these information (I can't even find 
it Glenn Knoll's book), and I imagine most people wouldn't be looking for them 
unless they start to worry about neutron activation of detector impurities.  In 
fact, since you are at LLNL and you probably got access to all kind of neat 
toys, that might the quickest way for you to find out.  Sounds like fun!

Tosh Ushino
SONGS
ushinot@songs.sce.com

---------------------------------------------------------------------------
Here is something for all the experts to ponder over the weekend.
     
What is compositon of detectors, including the weight percents of trace 
elements. Below is a list of detectors that we are considering for inclusion 
in an upcommming ICRU standard.
     
Si, Ge, CdTe, HgI2' GaAs, and the inorganic scintillators BGO, NaI(Tl), 
CsI(Tl), and CsI(Na)
     
It would be nice to be as accurate as possible and have the weight percents 
of all elements add to as close to 1.0 asis reasonably possible, without 
going over a value of 1.0. The importance lies in the use of the detector 
and the manufacture of the detectors. For instance, if too much lead is 
present in the NaI material used to grow the crystal, a discoloration of the 
crystal occurswhic changes the light transmission properties of the crystal. 
Lead is usally present at 0.0005% maximum.
     
So if any of you have some insights of references I can use I would be indebted.
     
     
If you want to respond directly, my e-mail is:
     
dhickman@llnl.gov
     
     
     
David P. Hickman, Ph.D.
     

Received: by ccmail from sce.com