Development of a fast neutron spectrometer based on a plastic fiber array

Abstract

Objective A three-dimensional position-sensitive fast neutron spectrometer is designed to measure fast neutron spectrum over 10 MeV. Methods The detector consists of a 16 × 16 mutually perpendicular plastic scintillation fiber array coupled to 2 × 2 Hamamatsu H8500C position-sensitive photomultiplier tubes by optical fibers. The fiber array is fabricated with 0.5 mm × 3 mm fibers and 3-mm square fibers. Results Due to the combined application of different sizes of fibers, the detector can broaden energy dynamic range and meanwhile have good detection efficiency. The method of the combined application of different sizes of plastic fibers in the array may provide a solution to measure wider energy range of solar neutrons. Conclusion In this paper, we used FLUKA to simulate the performance of the detector model and report the results of experimental studies with neutrons from a pulsed D-T neutron.

Simulation and design of a fast neutron radiography detector based on MCP

“…With the optimized thickness of HDPE, the detection efficiency of the detector is calculated by using the model shown in figure 1. The detection efficiency of the detector is defined as the ratio of the number of electrons escaping into the MCP channels from the channel wall to the number of the incoming neutrons [9], and the impact of the PS and CCD camera's quantum efficiency on detection efficiency is neglected in the calculations.. Simulation results show that the detector's detection efficiency is about 0.14%, which is comparable with the previous works [7,8,16].…”