Abstract
In this paper, multiple scattering of 137Cs gamma photons from composite materials is studied experimentally. Photons scattered in backward direction of 90° to the incident beam are detected by a NaI (Tl) detector. Single scattered events are reconstructed analytically to extract multiple scattered photons from the measured spectrum. We observe that for an increase in target thickness, there is an increase in multiple backscattered photons. After a particular thickness called as saturation thickness, multiple backscattered photons becomes almost a constant. The saturation thickness of the multiple scattered photons is used to assign effective atomic number for HDPE, UHMW, Nylon, Bakelite, Glass-epoxy, local wood (Hopea parviflora) and Portland Cement (grade 43). Experimental results are compared with Monte Carlo simulation. The ratio of single scattering events to multiple scattering events decreases for an increase in target thickness.
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