P: 11 Questions about Compton Scattering thanks for the link. The target for the primary X-rays ("scattering target") process is localized in the center of the chamber? Compton used the angle of recoiling electron to measure the angle of secondary ray, using this relation $$\cot\frac{1}{2}\delta=\tan\theta$$ ? The shown image in the nobel lecture is a it is a simplification of this image? http://hyperphysics.phy-astr.gsu.edu...ompdat.html#c1