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

作　　者：张金钊 庹先国 

机构地区：[1]Applied Nuclear Techniques in Geoscience Key Laboratory, Chengdu University of Technology

出　　处：《Chinese Physics C》2014年第7期139-143,共5页中国物理C（英文版）

基　　金：Supported by National Natural Science Foundation of China(41274109,41025015,41374112,11105132,41104118)

摘　　要：We present the design and optimization of a prompt T-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 PCNAA 2526f 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 the 252Cf neutron spectrum. Our new design shows a significantly improved per- formance 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.We present the design and optimization of a prompt T-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 PCNAA 2526f 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 the 252Cf neutron spectrum. Our new design shows a significantly improved per- formance 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.

关 键 词：PGNAA neutron source thermal neutron moderation REFLECTION 

分 类 号：O571.5[理学—粒子物理与原子核物理]