Influence of Beam Divergence and Crystal Mosaic Structure Upon   Parametric X-Ray Radiation Characteristics
  Based on kinematic model of parametric X-ray   Radiation (PXR), an approach for calculation of PXR characteristics (spectrum, intensity, polarization and yield) has been developed. The approach allows to take into account the beam divergence, mosaicity, aperture sizes, influence of $K$-edge, etc. using a uniform technique. 
A.P. Potylitsin