Compton scatter imaging (CSI) is well establish one-sided imaging approach, where the image is formed using photons that are singly scattered in a region of the object. However, the measured data includes also photons that are multiply scattered and is also affected by the fact that incoming and outgoing beams are attenuated. In this paper, the EGS4 code system is used to gain some insight into the physics that constrains CSI. The yields of singly and multiply scattered photons, obtained with monochromatic and X-ray tube inspecting beams, were assessed for a variety of media and depths.
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