采用直接抽样法和倒易方法计算探测器的通量，得到了一致的结果。
The direct sampling and the reciprocity method are applied to the calculation of the flux measured by a detector.
提出利用聚焦准直器代替单个准直器以达到增大探测器接收到的散射光子通量的目的。
Focusing collimators were used instead of single collimator to increase the scattering photon flux received by detector.
给出了计算探测器通量的物理模型及其解析表达式。
Physical model and the analytic expression for calculating the flux of the detector are given.
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