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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

刘敏俊, 石睿, 杨广, 等. 基于Geant4的α粒子能谱模拟研究及软件设计实现[J]. 强激光与粒子束, 2023, 35: 126003. doi: 10.11884/HPLPB202335.230143
引用本文: 刘敏俊, 石睿, 杨广, 等. 基于Geant4的α粒子能谱模拟研究及软件设计实现[J]. 强激光与粒子束, 2023, 35: 126003. doi: 10.11884/HPLPB202335.230143
Liu Minjun, Shi Rui, Yang Guang, et al. Research and software design of α particle energy spectrum simulation based on Geant4[J]. High Power Laser and Particle Beams, 2023, 35: 126003. doi: 10.11884/HPLPB202335.230143
Citation: Liu Minjun, Shi Rui, Yang Guang, et al. Research and software design of α particle energy spectrum simulation based on Geant4[J]. High Power Laser and Particle Beams, 2023, 35: 126003. 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
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

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

  • 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。
  • 图  1  几何因子计算示意图

    Figure  1.  Schematic diagram of geometry factor calculation

    图  2  整体研究方案

    Figure  2.  Integral research scheme

    图  3  PIPS-α谱仪腔室实物图

    Figure  3.  Photo of PIPS-α spectrometer chamber

    图  4  PIPS探测器物理模型

    Figure  4.  Physical model of the PIPS detector

    图  5  整体软件功能框图

    Figure  5.  Diagram of the software function

    图  6  软件模拟粒子技术路线

    Figure  6.  Technology line of simulation by the software

    图  7  软件主页面

    Figure  7.  Software main page

    图  8  功能界面

    Figure  8.  Functional interface

    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

    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

    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
    下载: 导出CSV

    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/mmmeasured detection efficiency/%analog detection efficiency/%analog detection efficiency range/%relative bias/%
    2.839.5538.6238.42~38.812.41
    6.827.1827.3727.04~27.650.69
    10.818.6318.4318.35~18.541.08
    14.813.0713.2813.25~13.311.58
    18.89.479.349.27~9.411.39
    下载: 导出CSV
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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

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