14 MeV快中子照相用光纤转换屏研究

Study on Optical Fiber Conversion Screen for 14 MeV Fast Neutron Radiography

快中子照相技术因其超强的样品透视能力而成为射线无损检测技术近年来研究的热点,转换屏是中子照相装置的关键部件。光纤转换屏是一种新型的快中子照相转换屏,较大程度兼顾了光纤阵列的高探测效率和荧光屏的高成像质量,具有很好的应用前景。本文以D-T加速器为中子源,用ZnS和环氧树脂以及光纤研制了快中子照相光纤转换屏,耦合科学级CCD数字成像系统,进行了快中子数字照相技术研究,获取了不同光纤排列方式的光纤转换屏积分曝光图像,同时测量了快中子荧光屏和塑料闪烁体等其他快中子照相用转换屏的发光效率,实验结果表明,光纤转换屏的发光效率高于其他类型转换屏的。

Fast neutron radiography technology has become a hot spot in recent years because of its strong sample transmission ability.Conversion screen is the key component of neutron radiography device.Optical fiber conversion screen is a new type of fast neutron radiography conversion screen,which takes into account the high detection efficiency of fiber array and the high imaging quality of the fluorescent screen,and has a good application prospect.Using D-T accelerator as neutron source,fast neutron radiography optical fiber conversion screen was developed by ZnS,epoxy resin and optical fiber,coupled with scientific CCD digital imaging system.The fast neutron radiography technology was studied.The integrated exposure images of optical fiber conversion screen with different optical fiber arrangement modes were obtained.Meanwhile,the detection efficiencies of fast neutron fluorescence screen and plastic scintillator were measured.The result shows that the detection efficiency of optical fiber conversion screen is better than that of other conversion screen.