NECTAR装置快中子照相能谱和散射的修正
Corrections on energy spectrum and scatterings for fast neutron radiography at NECTAR facility
摘要：
中子能谱和散射中子引起的畸变是快中子照相中的主要问题，应加以考虑以提高图像质量。本文重点介绍了在德国慕尼黑工业大学（TUM）研究堆FRM-II的NECTAR装置上进行的快中子照相的图像失真和偏差的消除。分析并建立了NECTAR能谱，修正了中子能谱的影响，并利用蒙特卡罗程序MCNPX模拟的点散射函数（PScF）评价了目标散射效应，提高了图像质量。良好的分析结果证明了上述两种修正方法的有效性。
英文摘要：
Neutron spectrum and scattered neutrons caused distortions 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 Universität München (TUM), Germany. The NECTAR energy spectrum is analyzed and established to modify the influence caused by neutron spectrum, as well as the Point Scattered Function (PScF) simulated by the Monte-Carlo program MCNPX is used to evaluate scattering effects from the object and improve images qualities. Good analysis results prove the sounded effects of above two corrections.
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