Angular properties of the scattered photons for combined 1.43 and 2.75 MeV source photons penetrating single and double-layer shields

In this paper, experimentally determined angular flux spectra for combined source energies of 1.43 and 2.75 MeV, penetrating single and double layer shields, are examined. Changes in the total scattered photon energy spectrum, as a function of polar angle and shield thickness, are also discussed. For any given polar angle, the scattered photon properties decrease exponentially with increasing shield thickness. Recently, similar conclusions were reported for single source photon energy (Kappos and Bishop, 1987).