| 支世杰,王继,吴金杰,等.192Ir γ射线球形石墨空腔电离室室壁修正系数的模拟计算[J].中华放射医学与防护杂志,2022,42(9):706-710.Zhi Shijie,Wang Ji,Wu Jinjie,et al.Simulation calculation of wall correction factor of 192Ir gamma-ray spherical graphite cavity ionization chamber[J].Chin J Radiol Med Prot,2022,42(9):706-710 |
| 192Ir γ射线球形石墨空腔电离室室壁修正系数的模拟计算 |
| Simulation calculation of wall correction factor of 192Ir gamma-ray spherical graphite cavity ionization chamber |
| 投稿时间：2022-06-03 |
| DOI：10.3760/cma.j.cn112271-20220603-00237 |
| 中文关键词: 石墨空腔电离室 绝对测量 室壁修正 EGSnrc模拟 |
| 英文关键词:Graphite cavity ionization chamber Absolute measurement Wall correction EGSnrc simulation |
| 基金项目:中国计量科学研究院基本科研业务费(AKYZZ2017) |
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| 中文摘要: |
| 目的 研究192Ir放射源参考空气比释动能率基准电离室(NIM-Ir-SG-100型)的室壁修正系数。方法 利用蒙特卡罗程序计算经过放射源包壳和辐照器模型的光子光谱和电离室室壁修正系数,并对影响室壁修正系数结果的光子能量、壁厚和电离室内径进行了模拟。结果 经计算,球形石墨空腔电离室室壁修正系数模拟结果为1.037 7。控制单一变量,光子能量(0.3~1.3) MeV、壁厚(0.2~0.5) cm、电离室内径(0.5~15) cm对室壁修正系数结果的最大偏差分别为1.62%、3.30%、2.86%。结论 自制球形石墨空腔电离室性能良好,室壁修正系数kwall值在合理范围内。室壁修正系数的完成为测量192Ir放射源的参考空气比释动能率,建立计量基准完成重要的一步。 |
| 英文摘要: |
| Objective To study the correction factor of the chamber wall of the reference air kerma rate reference ionization chamber (NIM-Ir-SG-100 type) for 192Ir radioactive source.Methods The photon spectrum and ionization chamber wall correction factor of the radioactive source housing and irradiator model are calculated by Monte Carlo code.And then the photon energy,wall thickness and ionization chamber diameter,which affect the result of the chamber wall correction factor,are simulated.Results After calculation,the simulation result of the correction factor of spherical graphite cavity ionization chamber wall was 1.037 7.Controlling a single variable,photon energy (0.3-1.3 MeV),wall thickness (0.2-0.5 cm),inner diameter (0.5-15 cm),the maximum deviations of wall correction result were 1.62%,3.30% and 2.86%,respectively.Conclusions The self-made spherical graphite cavity ionization chamber has good performance,and the corrected kwall value of the chamber wall is within a reasonable range.The completion of the chamber wall correction factor is an important step to measure the reference air kerma rate of the 192Ir radioactive source and establish the measurement benchmark. |
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