Solving the deep penetration problem in Monte Carlo simulation of airborne gamma-ray spectrum

Hexi WU; Xiuying YANG; Liangquan GE; Yibao LIU; Qianglin WEI; Bo YANG

doi:10.11889/j.0253-3219.2016.hjs.39.070201

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Solving the deep penetration problem in Monte Carlo simulation of airborne gamma-ray spectrum

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

- Solving the deep penetration problem in Monte Carlo simulation of airborne gamma-ray spectrum
- NUCLEAR TECHNIQUES Vol. 39, Issue 7, Article number: 070201(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.成都理工大学成都 610059;
  3.核工业240研究所沈阳 110032
- 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.39.070201
  CLC： TL817.2
- Received：02 March 2016，
  
  Revised：20 March 2016，
  
  Published：2016-07
- 稿件说明：
移动端阅览
Hexi WU, Xiuying YANG, Liangquan GE, et al. Solving the deep penetration problem in Monte Carlo simulation of airborne gamma-ray spectrum[J]. Nuclear techniques, 2016, 39(7): 070201
DOI：

Hexi WU, Xiuying YANG, Liangquan GE, et al. Solving the deep penetration problem in Monte Carlo simulation of airborne gamma-ray spectrum[J]. Nuclear techniques, 2016, 39(7): 070201 DOI： 10.11889/j.0253-3219.2016.hjs.39.070201.

摘要

蒙特卡罗（Monte Carlo

MC）模拟方法被广泛应用于γ能谱分析参数的获取，但因探测高度较高带来的深穿透问题限制了其在航空γ能谱中的应用。研究发现，探测器距离地层边界大于可探测半径时，MC模拟得到地层上空相同高度所有航空γ能谱仪响应规律均相同。根据这一规律，本文提出一种球壳型地层、航空γ探测器的MC模拟模型，通过对4个航空γ能谱仪刻度模型的模拟发现，MC模拟谱与多次实测平均谱吻合较好。同时利用该模型模拟了芬兰Vesivehmaa地区4种典型核素于100 m高空的刻度系数，结果显示模拟值与取样实测值及Allyson自编软件模拟值在±20%内符合，证明该模型能很好地应用于航空γ能谱仪地层信息反演计算参数的快速获取。

Abstract

Background

Monte Carlo (MC) simulation method is often used to estimate various parameters for analyzing gamma-ray spectrum

but the deep penetration constrains its application in airborne detection.

Purpose

This study aims to find a solution for the deep penetration problem in MC simulation of airborne gamma-ray spectrum. Methods: When many of same-sized airborne gamma-ray spectrometry (AGS) are placed in the same height and the distances between the center of each AGS and the boundary of stratum are greater than the detectable radius

the response laws of these AGSs are the same under infinite source particles. Based on the principle

a spherical shell model of MC simulation for an airborne gamma-ray spectrum is proposed to solve the above problem.

Results

Airborne gamma-ray spectrums of four calibration models are simulated by this spherical shell model on the MCNP (Monte Carlo N Particle) platform

which are in agreement with their respective observational average spectrums. Moreover

the estimated calibration factors of four radionuclides at 100-m altitude in the Vesivehmaa region of Finland are calculated by this method

which show an agreement within 20% error in comparison with the sampling methodology and simulation values of Allyson

et al.

Conclusion

The results verify that the spherical shell model has high simulation efficiency and can provide reliable parameters for inversing stratum information by airborne gamma-ray spectrum.

关键词

Keywords

references

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