Analyzing airborne gamma-ray spectrum by the least square method

Hexi WU; Liangquan GE; Yaoyao LUO; Yibao LIU; Fei YU

doi:10.11889/j.0253-3219.2016.hjs.39.110201

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Analyzing airborne gamma-ray spectrum by the least square method

LOW ENERGY ACCELERATOR, RAY AND APPLICATIONS | 更新时间：2021-05-24

- Analyzing airborne gamma-ray spectrum by the least square method
- NUCLEAR TECHNIQUES Vol. 39, Issue 11, Article number: 110201(2016)
- 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：
- 基金信息：
  
  National Natural Science Foundation of China;Open-ended Foundation from Engineering Research Center of Nuclear Technology Application, Ministry of Education
- DOI：10.11889/j.0253-3219.2016.hjs.39.110201
  CLC： TL817.2
- Received：05 September 2016，
  
  Revised：26 September 2016，
  
  Published：2016-11
- 稿件说明：
移动端阅览
Hexi WU, Liangquan GE, Yaoyao LUO, et al. Analyzing airborne gamma-ray spectrum by the least square method[J]. Nuclear techniques, 2016, 39(11): 110201
DOI：

Hexi WU, Liangquan GE, Yaoyao LUO, et al. Analyzing airborne gamma-ray spectrum by the least square method[J]. Nuclear techniques, 2016, 39(11): 110201 DOI： 10.11889/j.0253-3219.2016.hjs.39.110201.

摘要

在天然辐射环境下，无法找到仅含单一天然放射性系列的近似无限大地层用于获取航空γ谱仪的响应谱，这是导致无法利用最小二乘法解析航空γ能谱的关键问题所在。本文基于介质互换原理、地层模块化与分能区多次模拟的思想，通过构建Monte Carlo组合模型，从而获得了含不同放射性物质的任意形状地层上空航空γ谱仪的响应谱。依据航空γ能谱测点上γ辐射来源与石家庄动态带分析，建立了一套可靠的最小二乘法航空γ能谱解析模型。通过对野外10 km测线分析发现，当地层含量大于4×10

-6

时，该方法与标准方法分析结果相当。同时该方法为人工放射性核素响应谱的剥离提供参考。

Abstract

Background

It is difficult to establish the least square method for parsing airborne gamma-ray spectrum because the approximately infinite stratum does not exist when it contains only

235

U and

238

U series

232

Th series or

Purpose

This study aims to acquire the response spectrum of airborne gamma-ray spectrometry (AGS) by Monte Carlo simulation and establish the above-described method.

Methods

Based on the principle of media interchange

the basic thought of modular stratum and energy partitioning for characteristic gamma-ray

the combination model is used to obtain the AGS' response spectrum of any shape of stratum by Monte Carlo simulation. And the least square model for solving airborne gamma-ray spectrum is established by the above response spectrum.

Results

The corrected model of eU

eTh and

K content in stratum is acquired by analyzing the eight airborne gamma-ray spectra from the dynamic scale model in Shijiazhuang City. The calculation values of 10 km survey lines coincide with the specification for AGS when the content of natural radioactivity nuclide is larger than 4×10

-6

Conclusion

The results verify that the calculation model is a valid analytical technique of AGS for natural radioactivity nuclide in stratum. And it provides a valid method to acquire the AGS' response spectrum of artificial radioactivity nuclide.

关键词

Keywords

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