窄束X射线半价层测量法标定电子直线加速器的能量  

Calibration of the Energy of an Electron Linac by Measuring the Narrow-beam X-ray Half-value Layer

作　　者：严慧勇[1] 唐传祥[1] 李泉凤[1] 石成玉[1] 

机构地区：[1]清华大学工程物理系,北京100084

出　　处：《原子能科学技术》2003年第4期372-375,共4页Atomic Energy Science and Technology

摘　　要：X射线半价层测量法是一种常用的低能电子直线加速器能量标定方法,本文对窄束X射线半价层的测量方法进行了讨论。利用Monte Carlo程序MCNP4B对窄束X射线半价层进行了计算和分析,并与实测数据进行了比较,测量数据与MCNP4B计算结果符合得很好。此外,还讨论了准直锥的长度和材料、准直缝的尺寸、靶的厚度和材料等因素对半价层的影响。The halfvalue layer(HVL) of the broadbeam Xray is often used to calibrate the energy of an electron linac, but in some cases the measurement of the broadbeam Xray HVL is not convenient. Therefore, the measurement of the narrowbeam Xray HVL as a method to calibrate the energy of an electron linac is discussed in the paper. The MonteCarlo code, MCNP4B is used to calculate and analyze the narrowbeam Xray HVL, meanwhile the narrowbeam Xray HVLs are measured for the 2.5,4,6 and 9 MeV  electron linacs. There is a good agreement between the measured HVLs and the MCNP4Bcalculated results. Also, the length of a primary collimator, the width of a collimator slot, the thickness of a target and such other factors' influence on HVL is discussed, and some useful suggestions are given to reduce the measuring errors of the narrowbeam Xray HVL used to calibrate the energy of an electron linac.

关 键 词：X射线半价层测量法 标定 电子直线加速器 能量 准直锥 靶 准直缝 

分 类 号：TL53[核科学技术—核技术及应用]