attenuation coeff.

["Les Slaback, Health Physics" <SLABACK@micf.nist.gov>]

In addition to Hubbell's data, consider Berger's program XCOM based on this
data.  It is available on many BBs.
It allows the computation of the coefficient for any compound or mixture
on as fine an energy grid as desired.
It is available from NIST (I believe) as XGAM (same program, just a fancy,
user friendlyfront end).  See HPJ review.
XCOM is documented in
NBSIR 87-3597, XCOM: Photon Cross Sections on a Personal Computer. Berger and
Hubbell, July 1987
The data in the Rad Health Handbook was generated with this.
The output of this program is within the uncertainties of the data and theory,
so it represents the best current knowledge.
And it fits on one floppy.

SLABACK@MICF.NIST.GOV
   ...a little risk, like a bit of spice, adds flavor to life