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I understand that when X-rays pass through matter they interact in various ways, photoelectric, Compton, etc, which attenuate the beam. I am just slightly confused when it comes to coherent and incoherent scatter and exactly how they relate to the beam's attenuation, and when I should use one or the other or the total attenuation to model an X-ray beam.

For instance, I am working with an X-ray beam which I pass through a filter. The filter is a considerable distance away from the object, so I imagine I am really only interested in the X-rays that aren't scattered, as the scattered X-rays probably won't hit the target. In front of the target I have a buildup material which is in contact with the target, so I imagine, that both coherent and incoherent are important. The beam then hits the target, and I am interested in the beam attenuation vs depth, and in this case, I am definitely interested in both the photons which get scattered inside the target and the photons that penetrate deeper to determine the amount of energy deposited vs depth. My confusion comes in because I have heard people tell me 'model without coherent scatter at this part' or 'model with coherent scatter'. I guess does anyone have experience in this on what coefficients I should be using in the scenario I described? Thanks

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