HXCF测量医用辐射模体的质量衰减系数  

Measurement of the Mass Attenuation Coefficient of Medical Radiation Module by HXCF

作　　者：郭锴悦 赵天琦 郭思明[2] 蒋政 郄晓雨 余涛 吴金杰[2] GUO Kai-yue;ZHAO Tian-qi;GUO Si-ming;JIANG Zheng;QIE Xiao-yu;YU Tao;WU Jin-jie(China Jiliang University,Hangzhou,Zhejiang 310018,China;National Institute of Metrology,Beijing 100029,China;Hebei University of Science and Technology,Shijiazhuang,Hebei 050018,China;Chengdu University of Technology,Chengdu,Sichuan 610059,China)

机构地区：[1]中国计量大学,浙江杭州310018 [2]中国计量科学研究院,北京100029 [3]河北科技大学,河北石家庄050018 [4]成都理工大学,四川成都610059

出　　处：《计量学报》2023年第4期616-621,共6页Acta Metrologica Sinica

基　　金：中国计量科学研究院基本科研业务费(AKYZZ2115)。

摘　　要：质量衰减系数是X射线分析中的1个重要物理量,是目前最常用的辐射特性表征参数。硬X射线地面标定装置(hard X-ray calibration facility,HXCF)能为质量衰减系数的测量提供“单能、窄束”的实验条件,是研究质量衰减系数的理想装置。实验利用硬X射线地面标定装置,在40~80 keV能量范围内测定聚四氟乙烯(Poly tetra fluoroethylene,PTFE)和有机玻璃(Polymethyl methacrylate,PMMA)2种医用模体材料的质量衰减系数,并将测量得到的质量衰减系数与NIST数据库中的参考值进行对比,分析实验值与理论值的相对偏差。结果表明,2种材料的质量衰减系数曲线与理论值的变化趋势是一致的。其中,PTFE的测量值与理论值的最大相对偏差为5.274%@47 keV,PMMA的测量值与理论值的最大相对偏差为6.303%@51 keV。Mass attenuation coefficient is an important physical quantity in X-ray analysis,and it is the most commonly used radiation characterization parameter at present.The hard X-ray ground calibration device can provide“single energy and narrow beam”experimental conditions for the measurement of mass attenuation coefficient,and is an ideal device for the study of mass attenuation coefficient.The mass attenuation coefficients of two medical module materials,Poly tetra fluoroethylene(PTFE)and Polymethyl methacrylate(PMMA),were measured in the energy range of(40~80)keV with a hard X-ray ground calibration device.The measured mass attenuation coefficients were compared with the reference values in NIST database.The relative deviation between experimental value and theoretical value was analyzed.The results show that the variation trend of the mass attenuation coefficient curves of the two materials is consistent with the theoretical value.The maximum relative deviation between the measured values of PTFE and the theoretical values is 5.274%@47 keV,and the maximum relative deviation between the measured values of PMMA and the theoretical values is 6.303%@51 keV.

关 键 词：计量学 X射线 质量衰减系数 硬X射线地面标定装置 医用模体材料 

分 类 号：TB98[一般工业技术—计量学]