Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2012, Vol. 23 ›› Issue (6): 337-343 doi: 10.13538/j.1001-8042/nst.23.337-343

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Monte-Carlo simulation of cement neutron field distribution characteristics in PGNAA

YANG Jianbo; YANG Yigang; LI Yuanjing; TUO Xianguo; LI Zhe; LIU Mingzhe; CHENG Yi; MU Keliang; WANG Lei;   

  1. Department of Engineering Physics,Tsinghua University; Chengdu University of Technology; State Key Laboratory of Geohazard prevention & Geoenvironment Protection; Nuclear Power Institute of China;
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YANG Jianbo, YANG Yigang, LI Yuanjing, TUO Xianguo, LI Zhe, LIU Mingzhe, CHENG Yi, MU Keliang, WANG Lei, . Monte-Carlo simulation of cement neutron field distribution characteristics in PGNAA.Nuclear Science and Techniques, 2012, 23(6): 337-343     doi: 10.13538/j.1001-8042/nst.23.337-343

Abstract:

The distribution characteristics of the neutron field in cement was simulated using the MCNP code to comply with the requirements of an online Prompt Gamma Neutron Activation Analysis system.Simulation results showed that the neutron relative flux proportion reduced with increasing cement thickness.When the cement thickness remains unchanged,the reduced proportion of thermal neutrons increases to a small extent,but the epithermal, intermediate,and fast neutrons will decrease according to the geometric progression.H element in the cement mainly affects the reduction of fast neutrons and other single-substance elements,e.g.,O,Ca,~(56)Fe,Si,and Al.It also slows down the reduction of the fast neutrons via inelastic scattering.O contributes more than other elements in the reduction of fast neutrons.Changing the H content affects the thermal,epithermal,intermediate,and fast neutrons, while changing the Ca,Fe,and Si contents only influences the thermal,epithermal,and intermediate neutrons; hence, there is little effect on the reduction of fast neutrons.

Key words: Monte Carlo simulation, MCNP, Prompt gamma neutron activation analysis, Neutron field distribution, Neutron flux rate