Optimizing the design of a moderator-based neutron detector for a flat response curve in the 2–14 MeV energy range

✍ Scribed by Q.Y. Hu; B.J. Li; D. Zhang; H.S. Guo; G.Z. Yang; F.N. Si; J. Liu

• Publisher: Elsevier Science
• Year: 2009
• Tongue: English
• Weight: 327 KB
• Volume: 609
• Category: Article
• ISSN: 0168-9002
• DOI: 10.1016/j.nima.2009.08.055

✦ Synopsis

The efficiency of a neutron detector with boron trifluoride proportional tubes embedded in a polyethylene moderator was simulated with a Monte Carlo program. A moderator structure where the detector had uniform sensitivity for neutrons from 2 to 14 MeV was determined by simulation. A counter was built based on the simulation results. The counter's efficiencies were calibrated with an Am-Be source and an accelerator that served as a D-D and D-T neutron source. Experimental neutron efficiencies of these sources are approximately uniform. The simulated model was validated by the consistent results between the calculated and experimental data.