I. Orlic et al., PARAMETRIZATION OF THE TOTAL PHOTON MASS ATTENUATION COEFFICIENTS IN THE ENERGY-RANGE 0.1-1000 KEV, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 74(3), 1993, pp. 352-361
It is convenient to generate mass attenuation coefficients using semi-
empirical schemes. The validity of most of the existing schemes is lim
ited to a relatively narrow energy interval (1-40 keV) and their accur
acies are poor in some energy regions. In this work, a semi-empirical
scheme flexible enough to give a good fit to data in a very wide photo
n energy range (0.1-1000 keV) was employed. Fitting coefficients for t
he entire range were obtained by utilizing mass attenuation data from
two sources: (1) semi-empirical data of Henke et al. in the low photon
energy region, and (2) theoretical values generated with the XCOM cod
e for fitting in the high energy region. The root mean square of the f
it is generally less than 0.2% except for energies below 1 keV where t
he available data are scattered. A computer code for generating mass a
ttenuation coefficients based on the proposed scheme has been develope
d.