碳离子与工作气体相互作用的模拟分析  

Simulation Analysis of Carbon Ion Interactions with Working Gases

作　　者：侯玉苗 赵修良[1,2] 杨俊 贺三军 周超[1,2] 屈国普[1,2] HOU Yumiao;ZHAO Xiuliang;YANG Jun;HE Sanjun;ZHOU Chao;QU Guopu(School of Nuclear Science and Technology,University of South China,Hengyang 421001,China;Key Laboratory of Advanced Nuclear Energy Technology Design and Safety,Ministry of Education,421001,China)

机构地区：[1]南华大学核科学技术学院,衡阳421001 [2]先进核能技术设计与安全教育部重点实验室,衡阳421001

出　　处：《核电子学与探测技术》2024年第4期673-679,共7页Nuclear Electronics & Detection Technology

基　　金：国家重点研发计划课题(2022YFB3503604)。

摘　　要：气体探测器因其高倍增能力和分辨率预期可在碳离子测量领域发挥关键作用,工作气体的种类及比例是影响探测器灵敏度和精度的核心因素。本研究通过Geant4模拟碳离子入射不同工作气体的阻止能、射程及能量沉积率,并探讨了气体与碳离子之间的相互作用机制。结果表明:混合气体的阻止能介于纯惰性气体与猝灭气体之间,且随气体比例调整而变化;碳离子在三种混合气体中的射程有所不同;Ar-CF4混合气体在大部分深度范围内呈现更高的能量沉积率,且总体上Ar-CO_(2)/CH4/CF4(60-40)混合气体比例为碳离子能量沉积效果提供了更优的条件。在相同气体比例下,能量沉积率随碳离子能量的增加呈先降低后升高的趋势。本研究成果揭示了不同工作气体及比例对碳离子探测性能的重要影响,并为碳离子测量应用中的气体选择提供了重要的理论依据。Gas detectors,with their high multiplication ability and resolution,are expected to play a key role in carbon ion measurement.The type and ratio of working gases are crucial factors affecting the detectors sensitivity and accuracy.This study used Geant4 simulations to investigate the stopping power,range,and energy deposition rate of carbon ions in various working gases,exploring the interaction mechanisms between the gases and carbon ions.The results show that the stopping power of mixed gases lies between pure inert gases and quenching gases,changing with the gas ratio.The range of carbon ions varies in three mixed gases,with Ar-CF4 mixtures showing a higher energy deposition rate over most depth ranges.Overall,a gas mixture ratio of Ar-CO_(2)/CH4/CF4(60-40)offers better conditions for carbon ion energy deposition.At the same gas ratio,the energy deposition rate decreases and then increases with rising carbon ion energy.This study highlights the significant impact of different working gases and their ratios on carbon ion detection performance and provides crucial theoretical guidance for gas selection in carbon ion measurement applications.

关 键 词：碳离子 GEANT4 气体介质 

分 类 号：TL811[核科学技术—核技术及应用]