治疗水平剂量计校准因子不确定度评定的探讨  

In-depth study of calibration factor uncertainty evaluation of dosimeter for radiotherapy

作　　者：黄扬[1] 张圆月[1] 宿红[1] 赵景荣[1] 胡静[1] 

机构地区：[1]中国测试技术研究院,四川成都610021

出　　处：《中国测试技术》2008年第4期35-38,共4页CHINA MEASUREMENT & TESTING TECHNOLOGY

摘　　要：依据直接比较法检定治疗水平剂量计照射量校准因子和测量不确定度评定的黑箱模型原理,对X、γ射线照射量校准因子的数学模型进行了深入的分析,给出定义更加明确,逻辑更加严密,表达更加合理的数学模型。从影响量与其修正因子二者的标准不确定度之间的关系入手,解决了输入量可能为0,但输出量又需要用相对方差合成的方式,进而需要评定输入量的修正因子的相对标准不确定度的问题。According to the direct comparison method of verifying exposure calibration factor of dosimeter for radiotherapy and the principle of black box model for measurement uncertainty evaluation, the mathematical model of the calibration factor was further studied for the X-ray and the gamma-ray. The new model had clearer definition, more rigorous logic and more rational mathematical expression. Starting from the standard uncertainty relationship between influence value and its correction factor, the problem of evaluating the relative standard uncertainty of the correction factor of input quantity is resolved while the input value may be zero when the output quantity needed the relative combined variance.

关 键 词：校准因子 黑箱模型 影响量 修正因子 系统效应 随机效应 相对标准不确定度 相对合成方差 

分 类 号：TH774[机械工程—仪器科学与技术] TM930.115[机械工程—精密仪器及机械]