能量选择法中子照相技术  

Energy-selective neutron radiography

作　　者：王雨[1] 王洪立[1] 贺林峰[1] 魏国海[1] 郝丽杰[1] 刘蕴韬[1] 韩松柏[1] 陈东风[1] 

机构地区：[1]中国原子能科学研究院核物理研究所,北京102413

出　　处：《核技术》2015年第5期27-33,共7页Nuclear Techniques

基　　金：国家重点基础研究发展计划项目(No.2010CB833106)资助

摘　　要：能量选择中子照相是近年来新兴的中子照相技术,具有广泛的潜在应用前景。介绍了能量选择中子照相技术的基本原理,比较分析了机械速度选择器法、双晶单色器法、飞行时间法以及超镜和晶体过滤器结合法4种获取单色中子束的方法。介绍了能量选择中子照相技术在增强图像对比度、应力测量、织构分析以及相变过程研究等方面体现的优异特性和应用潜力。Background： A new method, energy selective neutron radiography, has been presented to be an advanced technique for determination of the crystalline structures in engineering materials. Numerous studies about the advanced technique were reported by the international well-known neutron scattering research centers. Purpose： The aim is to master the basic principles, instrument configuration optimization scheme and the application field. Methods： We analyzed the basic principles of the energy selective neutron radiography, compared different methods for achieving the monochrome neutron beam, and presented the application field which showed the data analysis methods. Results： When achieving the monochrome neutron beam, the velocity selector could get a much higher intensity but with a coarse resolution, the time of flight （TOF） method could get a much better resolution but with a lower intensity, and by using the double crystal method, the intensity and the resolution could realize the balance. So this technique could be used to enhance the in image contrast, measure the residual stress distribution, analysis the texture and study the phase transition of the materials. Conclusion： Energy selective neutron radiography is a very valuable experimental technique, which has an important application prospect.

关 键 词：中子照相 能量选择 应力 织构 相变 

分 类 号：TL99[核科学技术—核技术及应用] O571.56[理学—粒子物理与原子核物理]