本文件规定了在电离辐射计量领域中计算非？进行预选时间或计数的计数测量时的负电离辐射测量。被测对象来自总计数率和背景计数率以及基于评估模型的其他量。特别地，被测物可以是作为总计数率和背景计数率之差的净计数率，或样品的净活性。它还会受到测量系统校准、样品处理和其他因素的影响。 ISO 11929分为四个部分，涵盖了中的基本应用？伊索？11929-1、基于ISO 11929-2中ISO/IEC指南98-3:20 08/Suppl.1的高级应用、ISO 11929-3中展开方法的应用以及ISO 11929-4中的应用指南。 ISO 11929-1涵盖了电离辐射计量领域中常用的计数测量的基本应用。它仅限于可以根据ISO/IEC评估不确定性的应用？导游？98-3（JCGM 2008）。在ISO 11929-1:20 19，附件？一个随机影响的重复计数测量的特殊情况和ISO？11929-1:20 19，附件？B、包括使用线性模拟速率计的测量。 ISO 11929-2扩展了ISO？11929-1根据ISO/IEC对测量不确定度进行评估？导游？98-3:2008/Suppl.1。ISO 11929-2还提供了一些关于计数测量和测量中贝叶斯统计的一般方面的解释性说明。ISO 11929-3涉及使用展开方法进行测量的评估，以及如果通过展开方法进行评估，则对光谱多通道测量进行计数，特别是α和γ光谱测量。此外，它提供了一些如何处理相关性和协方差的建议。 ISO 11929-4为ISO 11929（所有部分）的应用提供了指导，简要总结了一般程序，然后给出了广泛的数值示例。这些示例涵盖了根据ISO 11929-1和ISO？11929-2. 如果涉及类似的评估模型，ISO 11929（所有部分）也类似地适用于任何类型的其他测量。进一步的实际例子可以在其他国际标准中找到，例如，见参考文献？[1至20]。笔记？一个名为UncertRadio的代码系统允许根据ISO进行计算？11929-1到ISO？11929-3.uncertradio[40][41]可从https://www.thuenen.de/en/fi/fields-of-activity/marine-environment/coordination-centre-of-radioactivity/uncertradio/免费下载。下载包含一个安装程序安装文件，该文件将所有文件和文件夹复制到用户指定的文件夹中。安装后，必须将信息添加到Windows的路径中，如pop所示？安装过程中打开窗口。可以选择英语，并提供广泛的“帮助”信息。另一个工具是包“met rology”[44]，可用于用R编程。它包含两个R函数“uncert”和“uncert MC”，它们分别通过解析或蒙特卡罗方法执行GUM-conform不确定性传播。包括输入量的协方差/相关性。在决策阈值和检测限计算的迭代中应用这两个函数显著简化了编程工作。也可以在包含蒙特卡罗插件的电子表格中或在其他商业数学软件中实现该文档。

This document specifies a procedure, in the field of ionizing radiation metrology, for the calculation of the “decision threshold”, the “detection limit” and the “limits of the coverage interval” for a non？negative ionizing radiation measurand when counting measurements with preselection of time or counts are carried out. The measurand results from a gross count rate and a background count rate as well as from further quantities on the basis of a model of the evaluation. In particular, the measurand can be the net count rate as the difference of the gross count rate and the background count rate, or the net activity of a sample. It can also be influenced by calibration of the measuring system, by sample treatment and by other factors. ISO 11929 has been divided into four parts covering elementary applications in？ISO？11929-1, advanced applications on the basis of the ISO/IEC Guide 98-3:2008/Suppl.1 in ISO 11929-2, applications to unfolding methods in ISO 11929-3, and guidance to the application in ISO 11929-4. ISO 11929-1 covers basic applications of counting measurements frequently used in the field of ionizing radiation metrology. It is restricted to applications for which the uncertainties can be evaluated on the basis of the ISO/IEC？Guide？98-3 (JCGM 2008). In ISO 11929-1:2019, Annex？A the special case of repeated counting measurements with random influences and in ISO？11929-1:2019, Annex？B, measurements with linear analogous ratemeters are covered. ISO 11929-2 extends ISO？11929-1 to the evaluation of measurement uncertainties according to the ISO/IEC？Guide？98-3:2008/Suppl.1. ISO 11929-2 also presents some explanatory notes regarding general aspects of counting measurements and Bayesian statistics in measurements. ISO 11929-3 deals with the evaluation of measurements using unfolding methods and counting spectrometric multi-channel measurements if evaluated by unfolding methods, in particular, alpha- and gamma-spectrometric measurements. Further, it provides some advice how to deal with correlations and covariances. ISO 11929-4 gives guidance to the application of ISO 11929 (all parts), summarizing shortly the general procedure and then presenting a wide range of numerical examples. The examples cover elementary applications according to ISO 11929-1 and ISO？11929-2. The ISO 11929 (all parts) also applies analogously to other measurements of any kind if a similar model of the evaluation is involved. Further practical examples can be found in other International Standards, for example, see References？[1 to 20]. NOTE？A code system, named UncertRadio, is available allowing for calculations according to ISO？11929-1 to ISO？11929-3. UncertRadio^[40][41] can be downloaded for free from https://www.thuenen.de/en/fi/fields-of-activity/marine-environment/coordination-centre-of-radioactivity/uncertradio/. The download contains a setup installation file that copies all files and folders into a folder specified by the user. After installation one has to add information to the PATH of Windows as indicated by a pop？up window during installation. English language can be chosen and extensive “help” information is available. Another tool is the package ‘metRology’^[44] which is available for programming in R. It contains the two R functions ‘uncert’ and ‘uncertMC’ which perform the GUM-conform uncertainty propagation, either analytically or by the Monte Carlo method, respectively. Covariances/correlations of input quantities are included. Applying these two functions within iterations for decision threshold and the detection limit calculations simplifies the programming effort significantly. It is also possible to implement this document in a spreadsheet containing a Monte Carlo add-in or into other commercial mathematics software.