Photon albedo coefficients as functions of μ/Zeff parameter

Abstract

This pa per pres ents the re sults of the anal y ses of pho ton re flec tion from pla nar tar gets for nor mal pho ton in ci dence and for dif fer ent shield ing ma te ri als (wa ter, con crete, alu mi num, iron, and cop per), in the range of the ini tial pho ton en er gies from 20 keV to 300 keV. Cal cu lations of pho ton re flec tion pa ram e ters based on the re sults of Monte Carlo sim u la tions of the pho ton trans port have been per formed us ing MCNP4C code. In te gral re flec tion co ef fi cients, pre sented as func tions of the ra tio of to tal cross-sec tion of pho tons and ef fec tive atomic number of tar get ma te rial, show uni ver sal be hav iour for all the ana lysed shield ing ma te ri als in the se lected en ergy do main.

Integral particle reflection coefficient for oblique incidence of photons as universal function in the domain of initial energies up to 300 keV

“…We have made an at tempt to an a lyze the oblique pho ton in ci dence us ing the ap proach and meth od ology ap plied for the nor mal in ci dence, de scribed in [7,10,11,13]. It is based on a three di men sional model of a pla nar thick slab of ma te rial which is a tar get for a nar row beam of monoenergetic pho tons.…”

“…Monte Carlo re sults for to tal num ber albedo of pho tons for oblique pho ton in ci dence were an a lyzed us ing the pa ram e ter µ/Z eff , (where µ is the to tal cross-sec tion of pho tons and Z eff is the ef fec tive atomic num ber of tar get ma te rial), i. e., the albedo coef fi cients are pre sented as func tions of the µ/Z eff param e ter, as it was done for nor mal pho ton in ci dence in ref. [11].…”

“…1. Val ues of the pa ram e ter µ/Z eff , which cor re spond to the given tar get ma te rial and ini tial pho ton en ergy, as de scribed in [11], are also pre sented in tab. 1.…”

“…This means that a sin gle func tion can de scribe reflec tion of one type of par ti cles from dif fer ent tar get ma te ri als and for dif fer ent par ti cle en er gies. Num ber of pa pers have been pub lished on this topic [3,[5][6][7][8][9][10][11].…”

“…In the pre vi ous ten years the au thors pub lished sev eral pa pers [7][8][9][10][11]13], in which anal y ses of pho ton re flec tion were done and the uni ver sal be hav ior of the in te gral re flec tion co ef fi cients was ex plored, based on the re sults of the Monte Carlo sim u la tions of pho ton trans port in a set of ma te ri als of in ter est. Those anal yses cov ered the do main of in ci dent pho ton en er gies up to 300 keV and were lim ited to nor mal pho ton in cidence only.…”