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 are calculated directly from a simple analytical expression. Atomic 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 equal 1%, in the energy range from 1 KeV to 1 GeV. The complete source listing of the program PHOTAC is included.
Citation Formats
Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F.
Calculation of photon attenuation coeeficients of elements and compounds from approximate semi-analytical formulae; Ccalculo de los coeficientes de atenuacion de fotones de elementos y compuestos a partir de formulas de aproximacion semianalitica.
Spain: N. p.,
1994.
Web.
Roteta, M, Baro, J, Fernandez-Varea, J M, & Salvat, F.
Calculation of photon attenuation coeeficients of elements and compounds from approximate semi-analytical formulae; Ccalculo de los coeficientes de atenuacion de fotones de elementos y compuestos a partir de formulas de aproximacion semianalitica.
Spain.
Roteta, M, Baro, J, Fernandez-Varea, J M, and Salvat, F.
1994.
"Calculation of photon attenuation coeeficients of elements and compounds from approximate semi-analytical formulae; Ccalculo de los coeficientes de atenuacion de fotones de elementos y compuestos a partir de formulas de aproximacion semianalitica."
Spain.
@misc{etde_10104693,
title = {Calculation of photon attenuation coeeficients of elements and compounds from approximate semi-analytical formulae; Ccalculo de los coeficientes de atenuacion de fotones de elementos y compuestos a partir de formulas de aproximacion semianalitica}
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 are calculated directly from a simple analytical expression. Atomic 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 equal 1%, in the energy range from 1 KeV to 1 GeV. The complete source listing of the program PHOTAC is included.}
place = {Spain}
year = {1994}
month = {Dec}
}
title = {Calculation of photon attenuation coeeficients of elements and compounds from approximate semi-analytical formulae; Ccalculo de los coeficientes de atenuacion de fotones de elementos y compuestos a partir de formulas de aproximacion semianalitica}
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 are calculated directly from a simple analytical expression. Atomic 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 equal 1%, in the energy range from 1 KeV to 1 GeV. The complete source listing of the program PHOTAC is included.}
place = {Spain}
year = {1994}
month = {Dec}
}