GB/T 16509-2008 in English

《GB/T 16509-2008辐射加工剂量测量不确定度评定导则》由TC58（全国核能标准化技术委员会）归口，TC58SC4（全国核能标准化技术委员会放射性同位素分会）执行，主管部门为国家标准化管理委员会。
标准详细说明了在γ射线、X射线（轫致辐射）和电子束辐射装置剂量测量中不确定度的可能来源，规定了使用剂量测量系统测量吸收剂量的不确定度的评定程序；同时定义并阐述了测量的基本概念、量的测量值的评价、真值、误差以及不确定度；规定了不确定度分量的评定方法，给出了这些分量对吸收剂量报告值的标准不确定度的贡献，并给出了合成标准不确定度的计算方法以及扩展（总）不确定度的评定方法。本标准代替GB/T 16509-1996《辐射加工剂量测量不确定度评定导则》。本标准与GB/T 16509-1996相比主要变化如下：
―――调整了部分术语和定义；
―――重新规定了标准的“意义与用途”；
―――增加了不确定度分量分类的依据以及分类的作用；
―――增加了不确定度Ａ 类评定的举例；
―――增加了剂量计测量系统校准的规定和分析；
―――增加了不同校准方法的不确定度分析；
―――增加了评定不确定度分量的目的；
―――调整了附录的全部内容；
―――删除了1996版中的附录B“文献目录”，增加“参考文献”。

Scope

1.1 This standard specifies the possible sources of uncertainty in the dose measurement of gamma-ray, X-ray (bremsstrahlung) and electron beam radiation devices, and specifies the evaluation procedure for the uncertainty of the absorbed dose measured by the dosimetry system; at the same time Defines and expounds the basic concept of measurement, the evaluation of the measured value of the quantity, the "true value", error and uncertainty; specifies the evaluation method of the uncertainty components, and gives the standard deviation of these components to the reported value of absorbed dose The contribution of the degree of certainty, and the calculation method of the combined standard uncertainty and the evaluation method of the expanded (total) uncertainty are given. The determination of uncertainty components follows the procedures of ISO, and this standard no longer uses the traditional concepts of precision and deviation, see Appendix E for examples. 1.2 This standard adopts practical knowledge of statistics (see references [1], [2], [3], [4]). 1.3 This standard does not address user-related safety issues, if any. The user of this standard is responsible for establishing applicable safety and health standards and determining applicable limitations prior to use.