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Now say I detect and analyze the outgoing gamma rays, I can know their energy with respect to the incoming gamma energy and angle difference but can one use this information to then calculate the depth and pinpoint the place where the interaction took place within the material ?

I would think for this one would need to know the place of original gamma going in and the place of scattered gamma coming out and then by measuring the energy difference one can know the angle and make a triangle and know the spot?

PS. Does the maximum angle of Compton scatter which is 180 degrees means that the incoming gamma is backscattered?