Study on the ability of maximum likelihood method to retrieve the positionof γ characteristic peaks

Wei CHEN; Chuanying SU; Tiancheng FENG; Wenbiao LIU; Zining TIAN

doi:10.11889/j.0253-3219.2018.hjs.41.120502

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Study on the ability of maximum likelihood method to retrieve the positionof γ characteristic peaks

NUCLEAR PHYSICS, INTERDISCIPLINARY RESEARCH | 更新时间：2021-05-19

- Study on the ability of maximum likelihood method to retrieve the positionof γ characteristic peaks
- NUCLEAR TECHNIQUES Vol. 41, Issue 12, Article number: 120502(2018)
- 作者机构：
  
  西北核技术研究所西安 710024
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China
- DOI：10.11889/j.0253-3219.2018.hjs.41.120502
  CLC： TL81
- Received：04 April 2018，
  
  Revised：09 July 2018，
  
  Published：10 December 2018
- 稿件说明：
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Wei CHEN, Chuanying SU, Tiancheng FENG, et al. Study on the ability of maximum likelihood method to retrieve the positionof γ characteristic peaks[J]. Nuclear techniques, 2018, 41(12): 120502
DOI：

Wei CHEN, Chuanying SU, Tiancheng FENG, et al. Study on the ability of maximum likelihood method to retrieve the positionof γ characteristic peaks[J]. Nuclear techniques, 2018, 41(12): 120502 DOI： 10.11889/j.0253-3219.2018.hjs.41.120502.

摘要

极大似然法反演γ能谱可有效提高γ能谱能量分辨率，为观察该方法反演γ特征峰位的能力，使用蒙特卡罗模拟程序MCNP（Monte Carlo N Particle Transport Code）计算了一台10.16cm×10.16cm×40.64cm NaI（Tl）探测器的能量响应矩阵，采用极大似然法和该能量响应矩阵对包含10种不同能量特征峰的MCNP模拟能谱、铅屏蔽室和实验室自然环境中测得的

152

Eu点源的γ能谱进行反演。结果显示：对模拟的γ能谱，反演后特征峰中心道址相对参考值最大偏差为1道；对铅屏蔽室中的

152

Eu γ能谱，反演后特征峰中心道址与实测值偏差小于2道；对实验室自然环境中

152

Eu γ能谱，反演后特征峰中心道址与实测值偏差小于4道。

Abstract

Background

The inversion of gamma spectrum by maximum likelihood method can effectively improve the energy resolution of gamma spectrum.

Purpose

This study aims to observe the ability of maximum likelihood method to retrieve the central channel of γ characteristic peaks.

Methods

Monte Carlo simulation program MCNP (Monte Carlo N Particle Transport Code) was used to calculate the energy response matrix of a 10.16 cm×10.16 cm×40.64 cm NaI(Tl) detector. Energy response matrix

the simulated spectra contained 10 different peaks

and the

152

Eu γ spectra obtained by the experiment were retrieved.

Results & Conclusions

The results showed that the maximum deviation of the peak center channel between the retrieved spectra and the simulated spectra was 1 channel

deviation between the retrieved spectrum and

152

Eu γ spectrum measured in the lead shielding room was less than 2 channels

the deviation between the retrieved spectrum and

152

Eu γ spectrum measured in the laboratory's natural environment was less than 4 channels.

关键词

Keywords

references

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