In many physical phenomena, the particle transport equation (Boltzmann equation) will beused to describe the particle transport process. For example, the neutron transport equation isappliedtocalculatetheneutrondistributionofthecoreandtheshieldingdesigninnuclearreactors.in the biomedical field , the transport theory are used to determine the dose of radiation therapy.In astrophysics, semiconductor physics, plasma physics, cosmic ray shower, gas discharge physicsand other disciplines, the neutron transport t...