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在小型 相机中 ,基于 射线与 Na I( T1 )晶体的相互作用及其产生的闪烁光子的传输特性 ,用 GEANT3软件包建立的一个蒙特卡罗模拟程序 ,研究闪烁光子在位置灵敏光电倍增管光阴极上的空间分布 ,结果表明用重心读出法得到的图象明显从周围向中心压缩 .本文讨论了这种压缩的物理机制 ,并提出了消除压缩效应的方法
In a small camera, a Monte Carlo simulation program based on the GEANT3 software package was developed based on the interaction between the radiation and the Na I (T1) crystal and the photons produced by the scintillation photons. The results show that the image obtained by the centroid readout method obviously compressed from the periphery to the center.In this paper, the physical mechanism of this compression is discussed and the method of eliminating the compression effect is proposed