I have a question regarding X-ray diffraction and energy conservation. If one considers elastic scattering from a rod-like structure, the observed diffraction pattern will change as the sample is illuminated from different directions. For some directions the pattern will be point-like, and for other angles like a circle, all according to the Ewald sphere. Now, my question is, will the energy scattered to a specific radius |q| in the reciprocal space be constant, assuming that the scattering volume is constant? I.e. will the same amount of energy be scattered to the points as for the whole ring? Or will more of the beam just continue in the forward direction in some cases, just to make sure the overall energy is conserved?