Neutronics aspects of position-sensitive neutron scintillator detectors using wavelength-shifting readout fibers.

摘要

Recent investigations in using wavelength-shifting fibers with scintillator screens for two-dimensional position sensitive neutron detection have shown this method to be effective and affordable. However, hydrogen and carbon atoms in the readout fibers scatter many neutrons traveling into the scintillator and affect the detector's efficiency and position resolution. In this work we seek to quantify these effects for various neutron energies using Monte Carlo simulations of different geometrical cases and suggest methods for mitigating negative effects from neutron scattering.