辐射防护 ›› 2019, Vol. 39 ›› Issue (4): 280-286.

• 剂量学基础 • 上一篇    下一篇

单球中子谱仪的能量响应模拟及解谱方法研究

邹益晟1, 肖德涛1, 张伟华2, 王志强2, 刘毅娜2, 李春娟2   

  1. 1.南华大学核科学技术学院,湖南衡阳 421000;
    2.中国原子能科学研究院计量测试部,北京 102413
  • 收稿日期:2018-08-29 出版日期:2019-07-15 发布日期:2019-10-29
  • 通讯作者: 肖德涛。E-mail:13307478601@189.cn
  • 作者简介:邹益晟(1994—),男,2012年本科毕业于南华大学核科学技术学院核工程与核技术专业,现为南华大学核科学技术学院辐射防护与环境保护专业在读研究生。E-mail:zouyisheng_94@qq.com

Energy response simulation and unfolding method research ofsingle sphere neutron spectrometer

ZOU Yisheng1, XIAO Detao1, ZHANG Weihua2, WANG Zhiqiang2, LIU Yina2, LI Chunjuan2   

  1. 1.School of Nuclear Science and Technology,University of South China,Hunan Hengyang 421001;
    2. Division of Radiation Metrology,China Institute of Atomic Energy,Beijing 102488
  • Received:2018-08-29 Online:2019-07-15 Published:2019-10-29

摘要: 本文阐述了单球中子谱仪的原理,介绍了基于单慢化球和19对6Li-7Li闪烁体探测器构成的单球中子谱仪的结构及解谱方法,使用蒙特卡罗中子输运程序模拟了单球中子谱仪的中子响应函数。计算结果表明,该谱仪具有较好的空间对称性,能根据谱仪中各探测器的计数对源的大致方位进行判断;模拟了单球谱仪在241Am-Be源照射下各探测器的计数,使用Unfolding with Maxed and Gravel (UMG)解谱程序在不同解谱算法以及初始谱的情况下对模拟数据进行解谱计算,在使用最大熵散发以及与源项相同的预置谱的情况下,解谱结果最为准确,验证了响应函数的准确性。

关键词: 单球中子谱仪, 蒙特卡罗模拟, 6Li-7Li闪烁体探测器, 能量响应, 解谱

Abstract: The principle and structure of the single sphere neutron spectrometer based on a spherical polyethylene moderator with 19 pairs of 6Li and 7Li scintillation detectors was described in this paper. Calculated neutron response functions by Monte Carlo Neutron-particle Transport Code showed that this spectrometer has good spatial symmetry, and the source location can be estimated by detector’s counts. Simulated spectrometer was exposed in 241Am-Be radiation field to obtain counts of each detector and to unfold the simulated results by using Unfolding with Maxed and Gravel (UMG) code to get the energy spectrum. Different algorithms and default spectrum were considered in unfolding process. Compared with expected spectrum, the spectrum unfolded by default spectrum of 241Am-Be standard source and maximum entropy method is the most accurate. The accuracy of response function is verified.

Key words: single sphere neutron spectrometer, monte carlo simulation, 6Li and 7 Li scintillator detectors, energy response, spectrum unfolding

中图分类号: 

  • TL72