Angular properties for combined 6.13 and 7.12 MeV source photons penetrating concrete, steel and lead

In this paper, experimentally determined angular flux spectra for combined source energies of 6.13 and 7.12 MeV, penetrating single layer shields of concrete, steel and lead are examined. A method for the calculation of the scattered photons energy, when multi-energy photons are emitted from a radioactive source, is described. Changes in the total scattered photon energy spectrum, as a function of polar angle and shield thickness are discussed.