Radiative Transport Reconsidered

We describe situations where coherent and incoherent effects take place in a disordered medium illuminated by a coherent source. We illustrate the transition from coherence to incoherence by considering the propagation of a scalar wave in a medium of point, isotropic scatterers. We note how a traditional transport equation evolves and that it is enriched by a boundary layer in which coherence decays and the intensity is of damped oscillatory nature.