EN ISO 11929-2:2021

Determination of the characteristics limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation - Fundamentals and application - Part 2: Advanced applications (ISO 11929-2:2019)

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[30,31].
ISO 11929 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 11885[8].
NOTE       A code system, named UncertRadio, is available for calculations according to ISO 119291 to ISO 11929-3. UncertRadio[27][28] 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 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. . Another tool is the package ?metRology'[32] 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, respectivel

Bestimmung der charakteristischen Grenzen (Erkennungsgrenze, Nachweisgrenze und Grenzen des Überdeckungsintervalls) bei Messungen ionisierender Strahlung - Grundlagen und Anwendungen - Teil 2: Fortgeschrittene Anwendungen (ISO 11929-2:2019)

Die Reihe ISO 11929 legt im Bereich der Metrologie ionisierender Strahlung ein Verfahren zur Berechnung der „Erkennungsgrenze“, der „Nachweisgrenze“ und der „Grenzen des Überdeckungsintervalls“ für eine nicht-nega-tive Messgröße der ionisierenden Strahlung bei Messungen mit Zeit- und Impulsvorwahl fest. Das Mess-ergebnis ergibt sich aus den Ergebnissen von Messungen einer Bruttozählrate und einer Nulleffektzählrate sowie weiteren Größen aufgrund eines Modells der Auswertung. Insbesondere kann die Messgröße die Netto¬zählrate als Differenz der Bruttozählrate und der Nulleffektzählrate oder die Nettoaktivität einer Probe sein. Sie kann auch durch Kalibrierung der Messeinrichtung, Probenbehandlung und andere Faktoren beein-flusst sein.
ISO 11929 ist in vier Teile aufgeteilt: elementare Anwendungen in ISO 11929-1, fortgeschrittene Anwendun¬gen auf der Grundlage von ISO/IEC Guide 98-3-1 in ISO 11929-2, Anwendungen auf Entfaltungsmethoden in ISO 11929-3 und Anleitungen zur Anwendung in ISO 11929-4.
ISO 11929-1 behandelt elementare Anwendungen zählender Messungen, wie sie häufig im Bereich der Metrologie ionisierender Strahlung auftreten werden. Sie beschränkt sich auf Anwendungen, bei denen die Unsicherheiten auf der Grundlage des ISO/IEC Guide 98-3 (JCGM 2008) ermittelt werden können. In Anhang A der ISO 11929-1:2019 wird der spezielle Fall wiederholter zählender Messungen mit zufälligen Einflüssen und in Anhang B der ISO 11929-1:2019 werden Messungen mit linearen analogen Ratemetern behandelt.
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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 2: Applications avancées (ISO 11929-2:2019)

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 l'ISO 11929-1, les applications avancées reposant sur le Guide ISO/IEC 98-3-1 dans le présent document, les applications aux méthodes de déconvolution dans l'ISO 11929-3, et les recommandations d'application dans l'ISO 11929-4.
L'ISO 11929-1 couvre les applications de base des mesurages par comptage souvent utilisées dans le domaine de la métrologie des rayonnements ionisants. Elle 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 de l'ISO 11929-1:2019 traite du cas particulier des mesurages répétés par comptage avec des influences aléatoires, alors que l'Annexe B de l'ISO 11929-1:2019 couvre les mesurages avec des ictomètres analogiques linéaires.
Le présent document étend l'ancienne ISO 11929:2010 à l'évaluation des incertitudes de mesure conformément au Guide ISO/IEC 98-3-1. Il 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 l'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 [30] et [31].
L'ISO 11929 s'applique également de manière analogue à d'autres mesurages de tout type, notamment si un modèle d'évaluation similaire est concerné. D'autres exemples pratiques sont, par exemple, disponibles 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 119291 à ISO 11929-3. UncertRadio[27][28] peut être téléchargé gratuitement à l'adresse: https://www.thuenen.de/en/fi/fields-of-activity/marine-environment/coordination-centre-of-radioactivity/uncertradio/. Le logiciel disponible en téléchargement contient un fichier d'installation qui copie tous les fichi

Ugotavljanje karakterističnih mej (odločitveni prag, zaznavanje meje in omejitev intervala pokritja) pri meritvah ionizirnega sevanja - Osnove in uporaba - 2. del: Napredne aplikacije (ISO 11929-2:2019)

General Information

• Status: Published
• Publication Date: 09-Feb-2021
• Withdrawal Date: 30-Aug-2021
• ICS: 17.240 - Radiation measurements
• Technical Committee: CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection
• Drafting Committee: CEN/TC 430 - Nuclear energy, nuclear technologies, and radiological protection
• Current Stage: 6060 - Definitive text made available (DAV) - Publishing
• Start Date: 10-Feb-2021
• Due Date: 22-Sep-2022
• Completion Date: 10-Feb-2021
• Ref Project: SIST EN ISO 11929-2:2021 - Determination of the characteristics limits (decision threshold, detection limit and limits of the coverage interval) for measurements of ionizing radiation - Fundamentals and application - Part 2: Advanced applications (ISO 11929-2:2019)

Standards Content (Sample)

SLOVENSKI STANDARD
01-april-2021
Ugotavljanje karakterističnih mej (odločitveni prag, zaznavanje meje in omejitev
intervala pokritja) pri meritvah ionizirnega sevanja - Osnove in uporaba - 2. del:
Napredne aplikacije (ISO 11929-2:2019)
Determination of the characteristics limits (decision threshold, detection limit and limits of
the coverage interval) for measurements of ionizing radiation - Fundamentals and
application - Part 2: Advanced applications (ISO 11929-2:2019)
Bestimmung der charakteristischen Grenzen (Erkennungsgrenze, Nachweisgrenze und
Grenzen des Überdeckungsintervalls) bei Messungen ionisierender Strahlung -
Grundlagen und Anwendungen - Teil 2: Fortgeschrittene Anwendungen (ISO 11929-
2:2019)
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 - Partie 2: Applications avancées (ISO 11929-2:2019)
Ta slovenski standard je istoveten z: EN ISO 11929-2:2021
ICS:
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 11929-2
EUROPEAN STANDARD
NORME EUROPÉENNE
February 2021
EUROPÄISCHE NORM
ICS 17.240
English Version
Determination of the characteristics limits (decision
threshold, detection limit and limits of the coverage
interval) for measurements of ionizing radiation -
Fundamentals and application - Part 2: Advanced
applications (ISO 11929-2:2019)
Détermination des limites caractéristiques (seuil de Bestimmung der charakteristischen Grenzen
décision, limite de détection et extrémités de (Erkennungsgrenze, Nachweisgrenze und Grenzen des
l'intervalle élargi) pour mesurages de rayonnements Überdeckungsintervalls) bei Messungen ionisierender
ionisants - Principes fondamentaux et applications - Strahlung - Grundlagen und Anwendungen - Teil 2:
Partie 2: Applications avancées (ISO 11929-2:2019) Fortgeschrittene Anwendungen (ISO 11929-2:2019)
This European Standard was approved by CEN on 18 January 2021.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this
European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references
concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN
member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by
translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 11929-2:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 11929-2:2019 has been prepared by Technical Committee ISO/TC 85 "Nuclear energy,
nuclear technologies, and radiological protection” of the International Organization for Standardization
(ISO) and has been taken over as EN ISO 11929-2:2021 by Technical Committee CEN/TC 430 “Nuclear
energy, nuclear technologies, and radiological protection” the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an
identical text or by endorsement, at the latest by August 2021, and conflicting national standards shall
be withdrawn at the latest by August 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 11929-2:2019 has been approved by CEN as EN ISO 11929-2:2021 without any
modification.
INTERNATIONAL ISO
STANDARD 11929-2
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 2:
Advanced 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 2: Applications avancées
Reference number
ISO 11929-2:2019(E)
©
ISO 2019
ISO 11929-2:2019(E)
© 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: [phone]
Fax: [phone]
Email: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

ISO 11929-2:2019(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 and reporting uncertainty and
characteristic limits . 9
6 Evaluation of a measurement on the basis of ISO/IEC Guide 98-3-1 .12
6.1 Introduction and decisions to be made .12
6.2 General aspects concerning the measurand and the model of evaluation .12
6.3 Establishing probability distributions for the input quantities .13
6.4 Propagating probability distributions .15
6.5 Evaluation of the primary measurement result .16
6.6 Standard uncertainty associated with the primary measurement result .16
7 PDF for an assumed true value of the measurand .17
8 Decision threshold, detection limit and assessments .17
8.1 Specifications.17
8.2 Decision threshold .17
8.3 Detection limit .18
8.4 Assessments .19
9 Limits of the coverage interval .19
9.1 General Aspects .19
9.2 The probabilistically symmetric coverage interval .20
9.3 The shortest coverage interval .20
10 The best estimate and its associated standard uncertainty .21
11 Documentation .21
Annex A (normative) Measurements with low count numbers .23
Annex B (informative) Explanatory notes .25
Bibliography .39
ISO 11929-2:2019(E)
Foreword
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This document was prepared by This document was prepared by ISO/TC 85, Nuclear energy, nuclear
technologies, and radiological protection, Subcommittee SC 2, Radiological protection.
This second e
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