When the instrument is placed in a

When the instrument is placed in a neutron field, the interactions with the neutron will cause a recoil proton to traverse a portion of the sphere. The neutron collides with a nucleus and is scattered with a loss of energy, which appears as the kinetic energy of the recoil nucleus. In tissue, elastic scattering is the dominant neutron interaction in the energy interval 10 KeV to 10 MeV the sum of the kinetic energies of the participating particles remains constant before and after the interaction. The average neutron energy loss will be one half for a collision with a hydrogen atom.