区域γ辐射定向监测仪准直器的设计

摘要

为区域γ辐射分布定向监测实验相机系统设计了一个针孔准直器。应用针孔准直器的解析公式,根据探测器内在分辨率和实验相机系统的预期分辨率,考虑探测器尺寸,确定了相机的焦距及准直器的张角;然后根据预期角分辨率计算有效孔径,得出孔径和孔深的范围;再利用蒙特卡罗方法模拟面源入射,在各种孔径和孔深组合中,挑选出透射和散射光子份额最小的组为最优组,对应孔径和孔深参数即为最优参数。%A Pinhole Collimator of one experimental gamma camera system used for territorial gamma-ray radiation measurement was designed.By using analytical formula of pinhole collimator,considering size of detector,and according to inner resolution of detector and anticipated resolution of the experimental camera system,the foci of the camera and the angle of the pinhole collimator can be confirmed.The range of diameter and depth of the pinhole were considered after effective aperture was calculated according to anticipated angle resolution.And then,simulating the incident of area source by use of Mont Carlo method,the group with smallest fraction of transmission and scatter is selected as excellent group.