A Monte Carlo simulation and setup optimization of output ef f iciency to PGNAA thermal neutron using ~(252)Cf neutrons

作者：ZHANG Jin Zhao; TUO Xian Guo; Applied Nuclear Techniques in Geoscience Key Laboratory Chengdu University of Technology

来源：Chinese Physics C, 2014, (07): 145-149.

• PGNAA
• neutron source
• thermal neutron
• moderation
• reflection

We present the design and optimization of a prompt γ-ray neutron activation analysis(PGNAA) thermal neutron output setup based on Monte Carlo simulations using MCNP5 computer code. In these simulations, the moderator materials, reflective materials, and structure of the PGNAA252 Cf neutrons of thermal neutron output setup are optimized. The simulation results reveal that the thin layer paraffin and the thick layer of heavy water moderating effect work best for the252 Cf neutron spectrum. Our new design shows a significantly improved performance of the thermal neutron flux and flux rate, that are increased by 3.02 times and 3.27 times, respectively,compared with the conventional neutron source design.

• 出版日期2014-7-15
• 单位成都理工大学