标准编号：ISO 11929-2:2019
中文名称：电离辐射测量特性极限的测定 基础和应用 第2部分：高级应用
英文名称：Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation — Fundamentals and application — Part 2: Adv
发布日期：2019-02
标准范围
The ISO 11929 series 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 GUM Supplement 1 in this document, 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 Annex A of ISO 11929-1:2019 the special case of
repeated counting measurements with random influences is covered, while measurements with linear
analogous ratemeters are covered in Annex B of ISO 11929-1:2019.
This document extends the former ISO 11929:2010 to the evaluation of measurement uncertainties
according to the ISO/IEC Guide 98-3-1. It also presents some explanatory notes regarding general
aspects of counting measurements and on 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, for
alpha- and gamma-spectrometric measurements. Further, it provides some advice on how to deal with
correlations and covariances.
ISO 11929-4 gives guidance to the application of ISO 11929, summarizes shortly the general procedure
and then presents a wide range of numerical examples. Information on the statistical roots of ISO 11929
and on its current development may be found elsewhere .
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