Calculation of Thermal Neutron Induced Electron Fluxes Generated in a Fiber-Optic Cerenkov Radiation Sensor Using Monte Carlo N-Particle Transport Code

Abstract

The purpose of this research is to develop a fiber-optic Cerenkov radiation sensor (FOCRS) for detecting thermal neutrons in mixed radiation fields. Thus, we designed a probe for FOCRS to detect thermal neutrons and background gamma rays using a Gd-157 foil and rutile crystal. A probe for a reference sensor to detect gamma rays was also designed with a rutile crystal. To clarify the relationship between electron fluxes and intensities of Cerenkov radiation, the electron fluxes inducing Cerenkov radiation in the probes of FOCRS and the reference sensor were calculated using Monte Carlo N-particle transport code (MCNPX) simulations.