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核技术  2015 

深贯穿问题脉冲高度计数减方差技巧

DOI: 10.11889/j.0253-3219.2015.hjs.38.030501, PP. 30501-30501

Keywords: 深贯穿,脉冲高度计数,减方差,Mesh-based权窗

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Abstract:

在处理核测井、辐射防护以及核医学等深贯穿问题时简单使用无偏方法会导致计算时间长且误差大。较新版本的MCNP程序在进行脉冲高度计数时可使用多种减方差技巧。本文使用蒙特卡罗程序代码MCNP51.51对包括Mesh-based权窗在内的多种减方差技巧的计算效率进行测试研究,旨在寻求较好的脉冲高度减方差技巧(Pulseheightvariancereductiontechniques,PHVRT)来解决深贯穿问题中计数效率低的问题。计算表明使用DX球配合强迫碰撞生成的权窗可大幅提高计算效率,对各参数进行优化后又可进一步大幅度提高计算效率。最终得出使用Mesh-based权窗配合其他减方差技巧可以很好解决深贯穿问题计算效率低问题。

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