ABSTRACT
ABSTRACT: The purpose of this research is to measure the neutrons in mixed radiation fields by using Cerenkov effect. In this research, we fabricated a fiber-optic Cerenkov radiation sensor using a Gd-foil, a rutile crystal and an optical fiber. A reference sensor was also fabricated with the rutile crystal and an optical fiber to remove noise signals induced by background gamma-rays. To clarify the relationship between electron fluxes and intensities of Cerenkov radiation, the electron fluxes inducing Cerenkov radiation in the fiber-optic Cerenkov radiation sensor were calculated by using the Monte Carlo N-particle transport code simulations. Finally, relative fluxes of thermal neutrons in a polyethylene generated by a Cf-252 neutron source were obtained by using the fiber-optic Cerenkov radiation sensor. The results obtained by the fiber-optic Cerenkov radiation sensor were close to calculated thermal neutron fluxes by using the Monte Carlo N-particle transport code simulations.
