Albedo factors of 123, 320, 511, 662 and 1115 keV gamma photons in carbon, aluminium, iron and copper

Abstract

Experimental measurements to study the variation of albedo factors in carbon, aluminium, iron and copper are carried out using gamma photons obtained from 57Co, 133Ba, 22Na, 137Cs and 65Zn. The back-scattered photons from the samples are detected by a \( 3^{\prime\prime}\times 3^{\prime\prime}\) NaI(Tl) scintillation detector placed at a backscattering angle of \( 180^{\circ}\). The variation of number albedo (\( A_{N}\)), energy albedo (\( A_{E}\)) and dose albedo (\( A_{D}\)) as a function of source energy and atomic number (Z) is studied. The experimentally obtained, response corrected variation of multiple scattered photons as a function of target thickness is compared with the Monte Carlo simulation using MCNP code and are in good agreement.