一种医用X射线单色仪的分析及优化  

Analysis and optimization of a medical X-ray monochromator

作　　者：栾梅 张键[1] 牟宽厚[1] 李瑶[2] LUAN Mei;ZHANG Jian;MOU Kuanhou;LI Yao(The First Affiliated Hospital of Xi’an Jiaotong University,Department of Dermatology,Shaanxi China,710061;College of Optoelectronic Engineering,Xi’an Technological University,Shaanxi China,710021)

机构地区：[1]西安交通大学第一附属医院皮肤科,陕西西安710061 [2]西安工业大学光电工程学院,陕西西安710021

出　　处：《光学技术》2022年第6期710-714,共5页Optical Technique

基　　金：国家自然科学基金(62001364);陕西省自然科学基础研究计划(2020JQ-818);西安交通大学第一附属医院院基金。

摘　　要：面向医学检测领域对单色X射线的应用需求,提出了一种X射线荧光单色仪的多阳极二次靶台结构优化设计方案。计算了不同能段X射线光子在人体皮肤、骨骼、脂肪中的穿透深度,通过蒙特卡洛软件MCNP计算了原级X射线的最佳靶角、光子产生效率和辐射特性,优选了阳极靶材料。在此基础上,通过建立多能量点X射线荧光单色仪的二次靶台结构模型,计算了不同阳极高压、靶角下二次铜靶的单色X射线转换效率,量化了其Kα特征谱的占比。研究的相关工作为评估X射线荧光单色仪的辐射特性提供了一定依据。Aiming at the application requirements of monochromatic X-ray source in the field of medical detection,an optimized design scheme of tunable X-ray fluorescence monochromator is proposed.Firstly,the penetration depth of X-ray photons in human skin,bones and fats under different X-ray energy bands were analysised,and the optimal target angle,X-ray generation efficiency and radiation characteristics were calculated by using the Monte Carlo N Particle Transport Code(MCNP),and the metal anode target material was optimized too.On this basis,the single-energy X-ray conversion efficiency of the secondary copper target under different anode voltages(kV) was calculated by establishing the target structure,and the proportion of the Kα characteristic spectrum was also calculated.These relevant works could provide a basis for the optimization and application of the medical X-ray fluorescence monochromator.

关 键 词：X射线单色仪 辐射特征 蒙特卡洛模拟 光子产生效率 阳极靶结构 

分 类 号：O434.1[机械工程—光学工程] O462.1[理学—光学]