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ISO 11929-1:2019

(Main)

Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation — Fundamentals and application — Part 1: Elementary applications

Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation — Fundamentals and application — Part 1: Elementary applications

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 https://www.thuenen.de/de/fi/arbeitsbereiche/meeresumwelt/leitstelle-umweltradioaktivitaet-in-fisch/uncertradio/. 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.

Détermination des limites caractéristiques (seuil de décision, limite de détection et extrémités de l'intervalle élargi) pour mesurages de rayonnements ionisants — Principes fondamentaux et applications — Partie 1: Applications élémentaires

La série ISO 11929 spécifie une procédure applicable, dans le domaine de la métrologie des rayonnements ionisants, pour le calcul du «seuil de décision», de la «limite de détection» et des «limites de l'intervalle élargi» pour un mesurande de rayonnement ionisant non négatif, lorsque des mesurages par comptage sont effectués avec une présélection du temps ou du nombre d'impulsions. Le mesurande résulte d'un taux de comptage brut et d'un taux de comptage du bruit de fond ainsi que de grandeurs supplémentaires reposant sur un modèle d'évaluation. En particulier, le mesurande peut être le taux de comptage net défini comme la différence du taux de comptage brut et du taux de comptage du bruit de fond, ou l'activité nette d'un échantillon. Il peut également être influencé par l'étalonnage du système de mesure, par le traitement de l'échantillon et par d'autres facteurs. L'ISO 11929 a été scindée en quatre parties couvrant les applications élémentaires dans le présent document, les applications avancées reposant sur le Guide ISO/IEC 3-1 dans l'ISO 11929-2, les applications aux méthodes de déconvolution dans l'ISO 11929-3, et les recommandations d'application dans l'ISO 11929-4. Le présent document couvre les applications de base des mesurages par comptage souvent utilisés dans le domaine de la métrologie des rayonnements ionisants. Il se limite aux applications pour lesquelles il est possible d'évaluer les incertitudes sur la base du Guide ISO/IEC 98-3 (JCGM 2008). L'Annexe A traite du cas particulier des mesurages répétés par comptage avec des influences aléatoires, alors que l'Annexe B couvre les mesurages avec des ictomètres analogiques linéaires. L'ISO 11929-2 étend l'ancienne ISO 11929:2010 à l'évaluation des incertitudes de mesure conformément au Guide ISO/IEC 98-3-1. L'ISO 11929-2 contient également plusieurs notes explicatives concernant les aspects généraux des mesurages par comptage et les statistiques bayésiennes dans les mesurages. L'ISO 11929-3 traite de l'évaluation des mesurages en utilisant des méthodes de déconvolution ainsi que de l'évaluation des mesurages multicanaux spectrométriques par comptage en cas d'évaluation par des méthodes de déconvolution, en particulier pour les mesurages spectrométriques alpha et gamma. Elle fournit en outre des conseils pour le traitement avec des corrélations et des covariances. L'ISO 11929-4 fournit des recommandations pour l'application de la série ISO 11929, résume les grandes lignes de la procédure générale et présente ensuite un large éventail d'exemples numériques. Des informations relatives à l'origine des statistiques de l'ISO 11929 et à son stade de développement actuel peuvent être trouvées dans les Références [33][34]. La série ISO 11929 s'applique également de manière analogue à d'autres mesurages de tout type, notamment si un modèle d'évaluation similaire est concerné. Des exemples pratiques complémentaires peuvent être trouvés, par exemple, dans l'ISO 18589[1], l'ISO 9696[2], l'ISO 9697[3], l'ISO 9698[4], l'ISO 10703[5], l'ISO 7503[6], l'ISO 28218[7] et l'ISO 11665[8]. NOTE Un logiciel, baptisé UncertRadio, est disponible pour les calculs conformes aux ISO 11929-1 à ISO 11929-3. UncertRadio[31][32] peut être téléchargé gratuitement à l'adresse: https://www.thuenen.de/de/fi/arbeitsbereiche/meeresumwelt/leitstelle-umweltradioaktivitaet-in-fisch/uncertradio/. Le logiciel disponible en téléchargement contient un fichier d'installation qui copie tous les fichiers et dossiers à un emplacement spécifié par l'utilisateur. Après l'installation, des informations doivent être saisies concernant le CHEMIN sous Windows qui a été indiqué dans une fenêtre contextuelle au cours de l'installation. La langue anglaise peut être choisie et des informations d'aide étendue sont proposées.

General Information

Status
Published
Publication Date
12-Feb-2019
ICS
17.240 - Radiation measurements
Technical Committee
ISO/TC 85/SC 2 - Radiological protection
Drafting Committee
ISO/TC 85/SC 2/WG 17 - Radioactivity measurements
Current Stage
9060 - Close of review
Start Date
02-Sep-2029
Ref Project

Relations

Revises
ISO 11929:2010 - Determination of the characteristic limits (decision threshold, detection limit and limits of the confidence interval) for measurements of ionizing radiation — Fundamentals and application
Effective Date
05-Nov-2015

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ISO 11929-1:2019 - Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation -- Fundamentals and applicationISO 11929-1:2019 - Determination of the characteristic limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation -- Fundamentals and application
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ISO 11929-1:2019 - Détermination des limites caractéristiques (seuil de décision, limite de détection et extrémités de l'intervalle élargi) pour mesurages de rayonnements ionisants -- Principes fondamentaux et applicationsISO 11929-1:2019 - Détermination des limites caractéristiques (seuil de décision, limite de détection et extrémités de l'intervalle élargi) pour mesurages de rayonnements ionisants -- Principes fondamentaux et applications
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Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 11929-1
Second edition
2019-02
Determination of the characteristic
limits (decision threshold, detection
limit and limits of the coverage
interval) for measurements of ionizing
radiation — Fundamentals and
application —
Part 1:
Elementary applications
Détermination des limites caractéristiques (seuil de décision, limite
de détection et extrémités de l'intervalle élargi) pour mesurages de
rayonnements ionisants — Principes fondamentaux et applications —
Partie 1: Applications élémentaires
Reference number
ISO 11929-1:2019(E)
©
ISO 2019

---------------------- Page: 1 ----------------------
ISO 11929-1:2019(E)

COPYRIGHT PROTECTED DOCUMENT
© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 11929-1:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 2
3 Terms and definitions . 2
4 Quantities and symbols . 6
5 Summary of procedures for evaluating a measurement and calculating the
characteristic limits . 8
5.1 General aspects . 8
5.2 Modelling the measurement . 9
5.3 General considerations about the applicability of the ISO/IEC Guide 98-3 . 9
5.4 Evaluating the input quantities, standard uncertainties and covariances, and the
primary result and its associated standard uncertainty .10
5.5 Evaluating the standard uncertainty as a function of an assumed true value of the
measurand .10
5.6 Calculating the decision threshold and decisions to be made .11
5.7 Calculating the detection limit and assessment of the measurement procedure .12
5.8 Calculating a coverage interval for the measurand .12
5.9 Calculating the best estimate of the measurand and its associated standard uncertainty 13
5.10 Reporting the results .14
6 Fundamentals and evaluation of the measurement .16
6.1 General aspects concerning the measurand .
...

NORME ISO
INTERNATIONALE 11929-1
Deuxième édition
2019-02
Détermination des limites
caractéristiques (seuil de décision,
limite de détection et extrémités de
l'intervalle élargi) pour mesurages de
rayonnements ionisants — Principes
fondamentaux et applications —
Partie 1:
Applications élémentaires
Determination of the characteristic limits (decision threshold,
detection limit and limits of the coverage interval) for measurements
of ionizing radiation — Fundamentals and application —
Part 1: Elementary applications
Numéro de référence
ISO 11929-1:2019(F)
©
ISO 2019

---------------------- Page: 1 ----------------------
ISO 11929-1:2019(F)

DOCUMENT PROTÉGÉ PAR COPYRIGHT
© ISO 2019
Tous droits réservés. Sauf prescription différente ou nécessité dans le contexte de sa mise en œuvre, aucune partie de cette
publication ne peut être reproduite ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique,
y compris la photocopie, ou la diffusion sur l’internet ou sur un intranet, sans autorisation écrite préalable. Une autorisation peut
être demandée à l’ISO à l’adresse ci-après ou au comité membre de l’ISO dans le pays du demandeur.
ISO copyright office
Case postale 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Genève
Tél.: +41 22 749 01 11
Fax: +41 22 749 09 47
E-mail: copyright@iso.org
Web: www.iso.org
Publié en Suisse
ii © ISO 2019 – Tous droits réservés

---------------------- Page: 2 ----------------------
ISO 11929-1:2019(F)

Sommaire Page
Avant-propos .iv
Introduction .v
1 Domaine d’application . 1
2 Références normatives . 2
3 Termes et définitions . 2
4 Grandeurs et symboles . 6
5 Résumé des procédures d’évaluation d’un mesurage et de calcul des limites
caractéristiques . 8
5.1 Aspects généraux . 8
5.2 Modélisation du mesurage . 9
5.3 Aspects généraux à considérer sur l’applicabilité du Guide ISO/IEC 98-3 . 9
5.4 Évaluation des grandeurs d’entrée, des incertitudes-types et des covariances, ainsi
que du résultat primaire et de son incertitude-type associée .10
5.5 Évaluation de l’incertitude-type en fonction d’une valeur vraie supposée du mesurande 11
5.6 Calcul du seuil de décision et décisions à prendre .11
5.7 Calcul de la limite de détection et évaluation de la procédure de mesure .12
5.8 Calcul d’un intervalle élargi pour le mesurande .13
5.9 Calcul de la meilleure estimation du mesurande et de son incertitude-type associée .14
5.10 Expression des résultats .14
6 Principes fondamentaux et évaluation du mesurage.16
6.1 Aspects généraux concernant le mesurande .16
6.2 Modèle d’évaluation .
...

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