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BS EN ISO 11929-1:2021

BS EN ISO 11929-1:2021

$189.07

Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation. Fundamentals and application – Elementary applications

Published By Publication Date Number of Pages
BSI 2021 50
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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 this document, advanced applications on the basis of the ISO/IEC Guide 3‑1 in ISO 11929‑2, applications to unfolding methods in ISO 11929‑3, and guidance to the application in ISO 11929‑4.

This document 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, the special case of repeated counting measurements with random influences is covered, while measurements with linear analogous ratemeters are covered in Annex B.

ISO 11929‑2 extends the former ISO 11929:2010 to the evaluation of measurement uncertainties according to the ISO/IEC Guide 98‑3‑1. ISO 11929‑2 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 the ISO 11929 series, 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[33][34].

The ISO 11929 series also applies analogously to other measurements of any kind especially if a similar model of the evaluation is involved. Further practical examples can be found, for example, in ISO 18589[1], ISO 9696[2], ISO 9697[3], ISO 9698[4], ISO 10703[5], ISO 7503[6], ISO 28218[7], and ISO 11665[8].

NOTE A code system, named UncertRadio, is available for calculations according to ISO 11929‑1 to ISO 11929‑3. UncertRadio[31][32] can be downloaded for free from /2. The download contains a setup installation file which 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.

PDF Catalog

PDF Pages PDF Title
2 National foreword
4 European foreword
6 Foreword
7 Introduction
9 1 Scope
10 2 Normative references
3 Terms and definitions
14 4 Quantities and symbols
16 5 Summary of procedures for evaluating a measurement and calculating the characteristic limits
5.1 General aspects
5.2 Modelling the measurement
17 5.3 General considerations about the applicability of the ISO/IEC Guide 98‑3
18 5.4 Evaluating the input quantities, standard uncertainties and covariances, and the primary result and its associated standard uncertainty
5.5 Evaluating the standard uncertainty as a function of an assumed true value of the measurand
19 5.6 Calculating the decision threshold and decisions to be made
20 5.7 Calculating the detection limit and assessment of the measurement procedure
5.8 Calculating a coverage interval for the measurand
21 5.9 Calculating the best estimate of the measurand and its associated standard uncertainty
5.10 Reporting the results
23 6 Fundamentals and evaluation of the measurement
6.1 General aspects concerning the measurand
6.2 Model of evaluation
6.2.1 General model
24 6.2.2 Model in ionizing radiation counting measurements
25 6.3 Evaluation of the primary measurement result
6.4 Standard uncertainty associated with the primary measurement result
26 7 Standard uncertainty as a function of an assumed value of the measurand
27 8 Decision threshold, detection limit and assessments
8.1 Specifications
8.2 Decision threshold
28 8.3 Detection limit
29 8.4 Assessments
9 Limits of the coverage interval
9.1 General aspects
30 9.2 The probabilistically symmetric coverage interval
9.3 The shortest coverage interval
31 10 The best estimate and its associated standard uncertainty
11 Documentation
33 Annex A (normative) Repeated counting measurements with random influences
38 Annex B (normative) Measurements with ratemeters
40 Annex C (informative) Calculation of the detection limit by iteration
42 Annex D (informative) Calculations with a generalized net count rate
45 Annex E (informative) Distribution function of the standardized normal distribution
47 Bibliography

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BS EN ISO 11929-1:2021
$189.07