A Gamma-ray in a uniform compton scatterer

Describing the transport of particles in a medium from a source with phase density ( ) Q x immersed in a medium, interaction of which with the particles is described by the operator L. In the problem under consideration, ( ) f x may denote the flux of photons, or their concentration, or some other local characteristics of the photon field at a point = ( , ) x r p of the phase space. For the sake of convenience, we will represent the photon momentum p through the pair of variables = / p Ω p (the direction unit vector) and = E cp (photon’s energy).