Gamma and X-ray detectors

[hickman3@popcorn.llnl.gov (David Hickman)]

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.