Transport processes of particles and physical quantities through matter constitute a physical fundamental occurring in an extremely broad range of applications. The original Boltzmann conservation equation, derived in study through a statistical approach of the transport of molecules in a medium, it is nowadays properly declined for the study of the transport of several different types of particles, from the spreading of cancer cells in human bodies, to the photons transport through matter and neutrons throughout a nuclear reactor core. As regards the case of neutrons, an accurate knowledge of the neutrons population distribution, consequence of the transport processes involving these particles and the nuclei of the background matter, constitutes a crucial basic for any assessments concerning reactor physics analysis, as design and safety analysis computations.