航空γ能谱仪无源效率刻度方法研究

吴和喜; 葛良全; 魏强林; 杨波; 罗耀耀; 刘义保; 余飞

doi:10.11889/j.0253-3219.2016.hjs.39.120202

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航空γ能谱仪无源效率刻度方法研究

低能加速器技术、射线技术及应用 | 更新时间：2021-05-24

- 航空γ能谱仪无源效率刻度方法研究
- Methodology study on the sourceless efficiency calibration of airborne gamma-ray spectrometry
- 核技术 2016年39卷第12期文章编号：120202
- 作者机构：
  
  1.东华理工大学核技术应用教育部工程研究中心南昌 330013
  2.东华理工大学核科学与工程学院南昌 330013
  3.成都理工大学成都 610059
- 作者简介：
  
  [ "吴和喜, 男, 1985年出生, 2010年于东华理工大学获硕士学位, 现为博士研究生, 讲师, 主要从事核探测及其数据处理研究", "WU Hexi, male, born in 1985, graduated from East China University of Technology with a master's degree in 2010, doctoral student, lecturer, mainly engaged in the research of nuclear detection and data processing" ]
  葛良全, E-mail:glq@cdut.edu.cn GE Liangquan, E-mail:glq@cdut.edu.cn
- 基金信息：
  
  国家自然科学基金(No.11505027);国家自然科学基金(No.11665001);国家自然科学基金(No.41604116);核技术应用教育部工程研究中心基金(No.HJSJYB2014-7 & 8)
- DOI：10.11889/j.0253-3219.2016.hjs.39.120202
  中图分类号： TL817.2
- 收稿日期：2016-08-31，
  
  修回日期：2016-09-19，
  
  纸质出版日期：2016-12
- 稿件说明：
移动端阅览
吴和喜, 葛良全, 魏强林, 等. 航空γ能谱仪无源效率刻度方法研究[J]. 核技术, 2016,39(12):120202

Hexi WU, Liangquan GE, Qianglin WEI, et al. Methodology study on the sourceless efficiency calibration of airborne gamma-ray spectrometry[J]. Nuclear techniques, 2016, 39(12): 120202
吴和喜, 葛良全, 魏强林, 等. 航空γ能谱仪无源效率刻度方法研究[J]. 核技术, 2016,39(12):120202 DOI： 10.11889/j.0253-3219.2016.hjs.39.120202.

Hexi WU, Liangquan GE, Qianglin WEI, et al. Methodology study on the sourceless efficiency calibration of airborne gamma-ray spectrometry[J]. Nuclear techniques, 2016, 39(12): 120202 DOI： 10.11889/j.0253-3219.2016.hjs.39.120202.

摘要

因人工放射性核素的航空γ能谱仪实物刻度模型匮乏，导致难以依据航空γ能谱准确反演地面人工放射性核素的含量。本文基于窄束γ射线指数衰变规律与微积分的思想建立了任意形状的γ辐射源上空航空γ能谱仪无源效率刻度的数值计算模型。通过低空探测实验、高空变化趋势分析、5-100 m高空探测实验证明该模型适用于任意位置点源航空γ能谱仪全能峰探测效率数值计算。同时计算发现在低空探测时不同γ辐射的面源与体源的航空γ能谱仪全能峰探测效率与MCNP5模拟值的相对偏差在±1.5%以内，且含1 460.83 keV或2614.533 keV γ射线的无限大体源90-150 m探测高空计算结果与石家庄动态带上的实验值相对偏差为8.33%-15.82%。上述实验充分证实该无源效率刻度计算模型适用于航空γ能谱探测实践，为利用航空γ能谱仪寻找丢失放射源及核事故应急监测提供技术支持。

Abstract

Background:

It is still difficult to establish all calibration models for significant short-lived artificial radionuclides because of the short half-life periods of most artificial radionuclides

potential radiation hazards

high cost

etc. Therefore

how to obtain more accurate quantitative results from airborne gamma-ray spectrum needs to be solved urgently.

Purpose:

This study aims to find a calculation model for efficiency calibration of airborne gamma-ray spectrometry (AGS).

Methods:

Based on the basic thought in calculus

tiny source is divided from gamma radiation on arbitrary shape by a grid partition method and seen as a point source. And the full-energy peak efficiency formula of AGS for a point source is derived in this paper. According to the superposition principle

the sourceless efficiency calibration method of AGS is established.

Results:

Firstly

the calculation values show an agreement within ±5% error in comparison with measurement values while a point source of

137

Cs is only a short distance away. Secondly

the calculation response law of different positions by this paper coincides with the experiment of Grasty

et al

. Finally

the calculation values show an agreement within ±10% error in comparison with measurement values while a point source of

137

Cs and

Co is put under the AGS-863 for 5-100 m. These prove that the numerical calculation is suitable for computing the full-energy peak efficiency of a point source. Meanwhile

the calculation values of a surface source and a volume source show an agreement within ±1.5% error in comparison with simulation values by MCNP5. And while AGS is 90-150 m away from infinite volume source

the calculation values of 1 460.83 keV and 2 614.533 keV are 8.33%-15.82% bigger than the measurement values.

Conclusion:

These results verify that the sourceless efficiency calibration method of AGS is accurate and reliable. It gives technical support for monitoring radionuclide deposition after nuclear accidents and locating radioactive sources using AGS.

关键词

Keywords

references

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