中子图像探测器的量子探测效率

摘要

为研究由中子-可见光图像转换屏、光学系统以及CCD相机组成的中子图像探测器的成像性能,根据探测效率、量子增益和调制传递函数等性能评价参数,分析了中子探测效率与闪烁体厚度的关系以及薄板型和阵列型闪烁体与CCD相机之间采用不同耦合方式下的量子增益,并给出了透镜耦合条件下的调制传递函数及相应的量子探测效率,最后全面分析了中子图像探测器的等效噪声量子数.%Imaging performances of neutron radiography detectors, which consist of neutron-optical photon converter, image optics subsystem and CCD camera, were analyzed elaborately. Firstly, the variation of detective efficiency with the thickness of scintilla-tor and the difference on quantum gain of two typical coupling methods between converter and CCD were discussed. Secondly, modulation transfer function and detective quantum efficiency with different lens coupling methods were described. Lastly, noise equivalent number of quanta was introduced to compare radiography detectors in theory.