基于Geant4的α粒子能谱模拟研究及软件设计实现

刘敏俊; 石睿; 杨广; 王博; 王洲; 曾雄; 闫成杰

doi:10.11884/HPLPB202335.230143

基于Geant4的α粒子能谱模拟研究及软件设计实现

doi: 10.11884/HPLPB202335.230143

刘敏俊^1,,
石睿^1, ,,
杨广²,
王博¹,
王洲¹,
曾雄¹,
闫成杰¹

1.
四川轻化工大学计算机科学与工程学院，四川宜宾 644005
2.
成都理工大学核技术与自动化工程学院，成都 610059

基金项目: 国家自然科学基金项目(42074218); 国家自然科学基金区域创新发展联合基金重点项目(U19A2086)；四川轻化工大学研究生创新基金项目(Y2022176)

详细信息

作者简介:
刘敏俊，2608467415@qq.com

通讯作者:
石　睿，shirui@suse.edu.cn。

中图分类号: TL814
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- 文章访问数: 566
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- PDF下载量: 96
- 被引次数: 0
出版历程
- 收稿日期: 2023-05-20
- 修回日期: 2023-08-14
- 录用日期: 2023-08-24
- 网络出版日期: 2023-11-07
- 刊出日期: 2023-12-15

Research and software design of α particle energy spectrum simulation based on Geant4

1.
School of Computer Science and Engineering, Sichuan University of Science & Engineering, Yibin 644005, China
2.
School of Nuclear Technology and Automation Engineering, Chengdu University of Technology, Chengdu 610059, China

摘要

摘要: 为进一步发展基于蒙特卡罗模拟方法的α粒子能谱探测参数优化技术，利用PyQt5设计一款调用蒙特卡罗模拟程序包Geant4进行α粒子能谱模拟研究的软件。一方面，建立了测量α粒子的钝化离子注入平面硅探测器（Passivated Implanted Planar Silicon）物理模型，根据实际α粒子测量条件对模拟的物理过程、模型材料及粒子源几何形状、成分等参数进行校正，结合PyQt5界面开发平台将粒子源参数、探测器参数修改等功能可视化。在多个探源距和不同真空压强条件下进行模拟实验，得到该模型的探测效率，并将获取的能量沉积成谱后，通过EMG-Landau响应函数模型展宽。另一方面，为验证该探测器模型的准确性，将模拟结果与实测结果的探测效率进行对比，实验结果表明，两者探测效率误差均在5%之内，且EMG-Landau响应函数模型展宽效果良好。本文研究结果验证了该Geant4模拟软件在α粒子能谱研究方面的可靠性，该软件可直观修改α粒子能谱测量条件，简化了模拟步骤，提高了模拟效率，为基于蒙特卡罗模拟方法的α粒子能谱探测参数优化技术提供了有力工具。
- PyQt5 /
- Geant4 /
- 钝化离子注入平面硅探测器 /
- 响应函数 /
- 探测效率
Abstract: To further develop the optimization technology of alpha particle energy spectrum detection parameters based on Monte Carlo simulation method, this paper uses PyQt5 to design a software that calls Monte Carlo simulation package Geant4 for alpha particle energy spectrum simulation research. On the one hand, a physical model of the Passivated Implanted Planar Silicon detector for measuring α particles is established, and the simulated physical process, model materials, particle source geometry, composition and other parameters are corrected according to the actual α particle measurement conditions, combined with the PyQt5 interface. The development platform visualizes functions such as particle source parameters and detector parameter modification. The detection efficiency of the model is obtained by performing simulation experiments under multiple detection distances and different vacuum pressure conditions, and after the acquired energy is deposited into a spectrum, it is broadened by the EMG-Landau (Exponentially Modified Gaussian and Landau) response function model. On the other hand, to verify the accuracy of the detector model, the detection efficiency of the simulation results and the measured results are compared. The experimental results show that the detection efficiency errors of both are within 5%, and the EMG-Landau response function model broadened works well. The research results of this paper verify the reliability of the Geant4 simulation software in the study of α-particle energy spectrum. The software can directly modify the measurement conditions of α-particle energy spectrum, simplify the simulation steps, and improve the simulation efficiency, thus provides a powerful tool for α-particle energy spectrum detection parameter optimization technology.
- PyQt5 /
- Geant4 /
- Passivated Implanted Planar Silicon /
- response function /
- detection efficiency

HTML全文

图 1 几何因子计算示意图

Figure 1. Schematic diagram of geometry factor calculation

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图 2 整体研究方案

Figure 2. Integral research scheme

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图 3 PIPS-α谱仪腔室实物图

Figure 3. Photo of PIPS-α spectrometer chamber

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图 4 PIPS探测器物理模型

Figure 4. Physical model of the PIPS detector

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图 5 整体软件功能框图

Figure 5. Diagram of the software function

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图 6 软件模拟粒子技术路线

Figure 6. Technology line of simulation by the software

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图 7 软件主页面

Figure 7. Software main page

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图 8 功能界面

Figure 8. Functional interface

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图 9 响应函数模拟能谱展宽效果图

Figure 9. Diagram of response function simulated energy spectrum broadening effect

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图 10 ²³⁸Pu四个大气压强下的Geant4模拟展宽图

Figure 10. Geant4 simulation stretching diagram of ²³⁸Pu under four atmospheres

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表 1 PIPS探测器腔室部件、尺寸和材料

Table 1. Components, dimensions and materials of PIPS detector chamber

part	material	density/(g/cm³)	inner radius/mm	outer radius/mm	half height/mm
probe top	stainless steel	8.06	0	8	3.655
probe	stainless steel	8.06	0	13.82	6.175
tray	aluminum	2.7	34	25.82	1
sample tray	stainless steel	8.06	0	12	0.25
slot stick	aluminum	2.7	34	1.15	1
dead layer	silicon	2.33	0	13.82	2.5×10⁻⁶
silicon layer	silicon	2.33	0	13.82	0.175
rubber layer	rubber	0.92	0	13.82	0.25
brass layer	brass	8.5	0	13.82	0.5
polyethylene layer	polyethylene	0.94	0	13.82	2

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表 2 ²³⁸Pu标准源探测效率实测值与Geant4模拟值的对比

Table 2. Comparison between measured value and Geant4 simulation value of detection efficiency of ²³⁸Pu standard source

probing distance/mm	measured detection efficiency/%	analog detection efficiency/%	analog detection efficiency range/%	relative bias/%
2.8	39.55	38.62	38.42～38.81	2.41
6.8	27.18	27.37	27.04～27.65	0.69
10.8	18.63	18.43	18.35～18.54	1.08
14.8	13.07	13.28	13.25～13.31	1.58
18.8	9.47	9.34	9.27～9.41	1.39

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