低能自由空气电离室优化设计  

Optimum Design of Free-air Ionization Chambers for Measuring Low Energy X-ray

作　　者：张曦[1] 宋明哲[1] 倪宁[1] 滕忠斌 ZHANG Xi;SONG Ming-zhe;NI Ning;TENG Zhong-bin(China Institute of Atomic Energy, National key Laboratory for Metrology and Calibration Techniques, Beijing 102413,China)

机构地区：[1]中国原子能科学研究院计量与校准技术重点实验室,北京102413

出　　处：《宇航计测技术》2019年第1期47-51,共5页Journal of Astronautic Metrology and Measurement

摘　　要：借助于空气比释动能的基本定义和概念以及空气比释动能绝对测量的理论方法,分析了自由空气电离室可以作为空气比释动能绝对测量方法的原理和条件。通过平板型与圆柱型自由空气电离室的优劣比较,选择平板型作为研究对象,详细介绍了经典的平板型自由空气电离室,并通过理论分析计算以及模拟计算的方法,优化设计包括:光阑半径、空气衰减长度、极间距等低能自由空气电离室的关键几何尺寸,以最小化空气比释动能测量时产生的总不确定度。By the means of the underlying definitions and the theoretical method of absolute measurement of airkerma,the principle and condition that free air chamber can be used as the absolute measurement method of air-kerma is analyzed theoretically. The parallel-plate type free air chamber is used in the measurement of air-kerma in the low energy X-rays by comparing with the cylindrical type free air chamber. The most commonly used design,parallel-plate type free air chamber,is discussed in detail and in particular with a view to optimization of the design parameters through the methods of theoretical analysis and simulations to minimize the overall uncertainty of the air-kerma determination.

关 键 词：自由空气电离室 优化设计 低能X射线 空气比释动能 

分 类 号：TL84[核科学技术—核技术及应用]