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Corrections on energy spectrum and scatterings for fast neutron radiography at NECTAR facility

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Chinese Physics C 2013年第11期37卷 114-120页

作者：刘树全 Bcherl Thomas 李航邹宇斌陆元荣郭之虞 State Key Lab of Nuclear Physics and Technology & School of Physics Peking University Technische Universitt Mnchen ZTWB Radiochemie Mnchen RCM Walther-Meissner-Str3Garching 85748 Germany Institute of Nuclear Physics and Chemistry Chinese Academy of Engineering Physics

Distortions caused by the neutron spectrum and scattered neutrons are major problems in fast neutron radiography and should be considered for improving the image quality. This paper puts emphasis on the removal of these image distortions and deviations for fast neutron radiography performed at the NECTAR facility of the research reactor FRM-II in Technische Universit/it Mfinchen （TUM）, Germany. The NECTAR energy spectrum is analyzed and established to modify the influence caused by the neutron spectrum, and the Point Scattered Function （PSeF） simulated by the Monte-Carlo program MCNPX is used to evaluate scattering effects from the object and improve image quality. Good analysis results prove the sound effects of the above two corrections.

关键词： fast neutron radiography correction energy spectrum scattering NECTAR

An empirical formula for scattered neutron components in fast neutron radiography

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Chinese Physics C 2011年第5期35卷 483-487页

作者：窦海峰唐彬 Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics

Scattering neutrons are one of the key factors that may affect the images of fast neutron radiography. In this paper, a mathematical model for scattered neutrons is developed on a cylinder sample, and an empirical formula for scattered neutrons is obtained. According to the results given by Monte Carlo methods, the parameters in the empirical formula are obtained with curve fitting, which confirms the logicality of the empirical formula. The curve-fitted parameters of common materials such as 6 LiD are given.

关键词： fast neutron radiography scattered neutrons empirical formula

neutron imaging at Peking University

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Engineering Sciences 2009年第4期7卷 83-85页

作者： Zou Yubin Guo Zhiyu Tang Guoyou Mo Dawei State Key Laboratory of Nuclear Physics and Technology ＆ School of Physics Peking University Beijing 100871 China

neutron imaging techniques were investigated at Peking University based on a 4.5 MV Van de Graaff *** thermal neutron radiography,fast neutron radiography and fast neutron resonance radiography were *** low neutron flux limits the image quality.A new radio frequency quadrupole (RFQ) accelerator based on neutron source with a yield of 1 012 n/s is being set up.

关键词： neutron imaging thermal neutron radiography fast neutron radiography fast neutron resonance radiography