Pulse-height tally variance reduction in deep penetration problem

LI Changkai; TANG Xiaobin; YUE Aizhong

doi:10.11889/j.0253-3219.2015.hjs.38.030501

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Pulse-height tally variance reduction in deep penetration problem

更新时间：2021-03-03

- Pulse-height tally variance reduction in deep penetration problem
- NUCLEAR TECHNIQUES Vol. 38, Issue 3, Article number: 030501(2015)
- 作者机构：
  
  1. 南京航空航天大学核科学与工程系,南京,210016
  2. 中石油测井有限公司,西安,710077
- 作者简介：
- 基金信息：
- DOI：10.11889/j.0253-3219.2015.hjs.38.030501
  CLC：
- Published：09 March 2015
- 稿件说明：
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LI Changkai, TANG Xiaobin, YUE Aizhong. Pulse-height tally variance reduction in deep penetration problem[J]. Nuclear techniques, 2015, 38(3): 030501
DOI：

LI Changkai, TANG Xiaobin, YUE Aizhong. Pulse-height tally variance reduction in deep penetration problem[J]. Nuclear techniques, 2015, 38(3): 030501 DOI： 10.11889/j.0253-3219.2015.hjs.38.030501.

摘要

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MCNP5 1.51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(Pulse height variance reduction techniques

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。

Abstract

Background: In deep penetration application such as well-logging

medical physics and radiation shielding

analog Monte Carlo method will cause long calculation time and large variance. The newly released Monte Carlo code MCNP5 version 1.51 allows almost all of MCNP’s variance reduction techniques to be used with pulse height tally. Purpose: This paper aims to find an optimize pulse height variance reduction technique (PHVRT) to solve low efficiency with pulse-height tallies in deep penetration problems. Methods: A variety of variance reduction techniques including an auto-important sampling method-Mesh-based weight windows were proposed

and all kinds of variance reduction techniques proposed were tested and results with different variance reduction techniques were compared. Results: Mesh-based weight windows used with DXTRAN and forced collision get good calculation efficiency. After optimizing

the efficiency can be improved with large amplitude. Conclusion: Mesh-based weight window used with other variance reduction techniques can resolve deep penetration problem effectively. Abstract

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