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为了计算中子厚针孔准直器的成像质量、点扩散函数、像面中子注量分布等,可利用MCNP5程序通过计算位于像面处的点探测器阵列的中子点通量分布来实现,但这种计算耗时较长,且计算得到的图像数据的统计涨落较大。研究了中子经过厚针孔准直器后在像面处的直穿中子注量分布快速计算方法,并据此建立了中子厚针孔成像快速计算程序WINPSF,其计算结果与MCNP5计算结果相符,而在计算速度和计算结果的统计特性等方面均优于MCNP5。
In order to calculate the neutron thick pinhole collimator imaging quality, point spread function, image neutron flux distribution, MCNP5 program can be used by calculating the point detector array located at the image plane neutron flux distribution However, this calculation takes a long time and the statistical fluctuation of the calculated image data is larger. The fast calculation method of the direct-penetrating neutron fluence distribution of the neutron after passing through the thick pinhole collimator was studied. Based on this, WINPSF, a fast calculation program of neutron thick pinhole imaging, was established. The calculation results were in good agreement with those calculated by MCNP5 The results were consistent with those of MCNP5 in terms of computational speed and the statistical properties of the calculated results.