EN ISO 23547:2023

SLOVENSKI STANDARD
01-september-2023
Merjenje radioaktivnosti - Radionuklidi, ki sevajo gama žarke - Specifikacije
referenčnega merilnega standarda za kalibracijo spektrometrov žarkov gama (ISO
23547:2022)
Measurement of radioactivity - Gamma emitting radionuclides - Reference measurement
standard specifications for the calibration of gamma-ray spectrometers (ISO 23547:2022)
Mesurage de la radioactivité - Radionucléides émetteurs gamma - Caractéristiques des
étalons de mesure pour l’étalonnage de spectromètres gamma (ISO 23547:2022)
Ta slovenski standard je istoveten z: EN ISO 23547:2023
ICS:
17.240 Merjenje sevanja Radiation measurements
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 23547
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2023
EUROPÄISCHE NORM
ICS 17.240
English Version
Measurement of radioactivity - Gamma emitting
radionuclides - Reference measurement standard
specifications for the calibration of gamma-ray
spectrometers (ISO 23547:2022)
Mesurage de la radioactivité - Radionucléides
émetteurs gamma - Caractéristiques des étalons de
mesure pour l'étalonnage de spectromètres gamma
(ISO 23547:2022)
This European Standard was approved by CEN on 16 July 2023.

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, Türkiye 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
© 2023 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23547:2023 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 23547:2022 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 23547:2023 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 January 2024, and conflicting national standards shall
be withdrawn at the latest by January 2024.
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.
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye and the
United Kingdom.
Endorsement notice
The text of ISO 23547:2022 has been approved by CEN as EN ISO 23547:2023 without any modification.

INTERNATIONAL ISO
STANDARD 23547
First edition
2022-05
Measurement of radioactivity —
Gamma emitting radionuclides —
Reference measurement standard
specifications for the calibration of
gamma-ray spectrometers
Mesurage de la radioactivité — Radionucléides émetteurs gamma —
Caractéristiques des étalons de mesure de référence pour l’étalonnage
de spectromètres gamma
Reference number
ISO 23547:2022(E)
ISO 23547:2022(E)
© ISO 2022
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
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii
ISO 23547:2022(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Metrological traceability of reference measurement standards (RMSs) .3
5 Specification of measurement standards . 4
5.1 General . 4
5.2 Reference measurement standard . 5
5.2.1 General requirements . 5
5.2.2 Container and matrix of the solid reference standards . . 6
5.2.3 Activity . 6
5.2.4 Homogeneity of radioactivity in the solid reference measurement standard . 7
5.2.5 Radionuclides . 7
5.3 Working measurement standards (WMSs) . 8
5.3.1 General requirements . 8
5.3.2 Activity . 9
5.3.3 Homogeneity . 9
5.3.4 Radionuclides . 9
6 Transfer devices . 9
6.1 Transfer measurement device . 9
6.2 Calibration . 9
Annex A (informative) Procedures for preparation of working measurement standards
from liquid source reference measurement standard .10
Bibliography .12
iii
ISO 23547:2022(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www.iso.org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation on the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see the following
URL: www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 85, Nuclear energy, nuclear technologies,
and radiological protection, Subcommittee SC 2, Radiological protection.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO 23547:2022(E)
Introduction
Everyone is exposed to natural radiation. The natural sources of radiation are cosmic rays and
naturally occurring radioactive substances existing in the Earth itself and inside the human body.
Human activities involving the use of radiation and radioactive substances cause radiation exposure in
addition to the natural exposure. Some individual activities, such as the mining, use of ores containing
naturally radioactive substances and the production of energy by burning coal that contains such
substances, can simply enhance the exposure from natural radiation sources. Nuclear installations
use radioactive materials and produce radioactive effluent and waste during operations. The use of
radioactive materials in industry, medicine, agriculture and research is expanding around the globe.
All these human activities generally also give rise to radiation exposures that are only a small fraction
of the global average level of natural exposure. The medical use of radiation is the largest and a growing
man-made source of radiation exposure in developed countries. It includes diagnostic radiology,
radiotherapy, nuclear medicine and interventional radiology.
Radiation exposure also occurs as a result of occupational activities. It is incurred by workers in
industry, medicine and research using radiation or radioactive substances, as well as by
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