水吸收剂量直接法测量的不确定度来源与控制  

Source and control of uncertainty in direct measurement of absorbed dose to water

作　　者：陆逊[1] 韩瑜[1] 曹程明[1] 眭国平[1] 孙荣荣[1] 肖瑶[1] 王鹏德[1] 邹建新 

机构地区：[1]上海市计量测试技术研究院

出　　处：《上海计量测试》2018年第1期7-10,共4页Shanghai Measurement and Testing

基　　金：国家质检总局公益性行业科研专项(201510001-03)

摘　　要：对上海地区医疗机构主流使用的医用电子加速器高能光子,采用国际通行的水吸收剂量直接测量试验。分析、评价测量结果的影响因素,评定水吸收剂量实际测量结果的不确定度约为2.9%(k=2)。分析结果表明,控制好测量的水下参考点位置和准确使用k_Q值,是现阶段标准改进、发展的方向。The absorbed dose to water of the high energy photon emitted by the frequently-used medical electron accelerator was measured using the internationally common direct methodin several medical institutions of Shanghai. The infuence factors and the uncertainties was analyzed and evaluated. The total relativeexpanded uncertainty of the measured result by direct method was 2.9% （k = 2）. The results of analysis show that, appropriatelocation of the reference point underwater and the accuracy of the kQ value are meaningful to establish the secondary standardat the current stage.

关 键 词：水吸收剂量 测量不确定度 量值溯源 

分 类 号：TB9[一般工业技术—计量学]