Abstract
The FORTRAN 77 code PHOTAC to compute photon attenuation coefficients of elements and compounds is described. The code is based on the semi analytical approximate atomic cross sections proposed by Baro et al. (1994). Photoelectric cross sections for coherent and incoherent scattering and for pair production are obtained as integrals of the corresponding differential cross sections. These integrals are evaluated, to a pre-selected accuracy, by using a 20-point Gauss adaptive integration algorithm. Calculated attenuation coefficients agree with recently compiled databases to within - 1%, in the energy range from 1 keV to 1 GeV. The complete source listing of the program PHOTAC is included. (Author) 14 refs.
Citation Formats
Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F.
Calculation of photon attenuation coefficients of elements and compounds from approximate semi-analytical formulae.
Spain: N. p.,
1994.
Web.
Roteta, M, Baro, J, Fernandez-Varea, J M, & Salvat, F.
Calculation of photon attenuation coefficients of elements and compounds from approximate semi-analytical formulae.
Spain.
Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F.
1994.
"Calculation of photon attenuation coefficients of elements and compounds from approximate semi-analytical formulae."
Spain.
@misc{etde_20930046,
title = {Calculation of photon attenuation coefficients of elements and compounds from approximate semi-analytical formulae}
author = {Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F}
abstractNote = {The FORTRAN 77 code PHOTAC to compute photon attenuation coefficients of elements and compounds is described. The code is based on the semi analytical approximate atomic cross sections proposed by Baro et al. (1994). Photoelectric cross sections for coherent and incoherent scattering and for pair production are obtained as integrals of the corresponding differential cross sections. These integrals are evaluated, to a pre-selected accuracy, by using a 20-point Gauss adaptive integration algorithm. Calculated attenuation coefficients agree with recently compiled databases to within - 1%, in the energy range from 1 keV to 1 GeV. The complete source listing of the program PHOTAC is included. (Author) 14 refs.}
place = {Spain}
year = {1994}
month = {Jul}
}
title = {Calculation of photon attenuation coefficients of elements and compounds from approximate semi-analytical formulae}
author = {Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F}
abstractNote = {The FORTRAN 77 code PHOTAC to compute photon attenuation coefficients of elements and compounds is described. The code is based on the semi analytical approximate atomic cross sections proposed by Baro et al. (1994). Photoelectric cross sections for coherent and incoherent scattering and for pair production are obtained as integrals of the corresponding differential cross sections. These integrals are evaluated, to a pre-selected accuracy, by using a 20-point Gauss adaptive integration algorithm. Calculated attenuation coefficients agree with recently compiled databases to within - 1%, in the energy range from 1 keV to 1 GeV. The complete source listing of the program PHOTAC is included. (Author) 14 refs.}
place = {Spain}
year = {1994}
month = {Jul}
}