  We have considered X-ray radiation of a relativistic charged particle moving
in a system consisting of microspheres distributed randomly in a dielectric
material. A new mechanism based on the diffusional scattering of pseudophotons
is suggested. The result leads to a stronger dependence of radiation intensity
on the particle energy, than that predicted by the traditional transition
radiation theory,and explains a recent experiment on such a system of randomly
distributed superconducting granules.

Disordered Systems and Neural Networks