EN ISO 19232-3:2025

SLOVENSKI STANDARD
01-oktober-2025
Neporušitvene preiskave - Kakovost radiografske slike - 3. del: Stopnje kakovosti
slike (ISO 19232-3:2025)
Non-destructive testing - Image quality of radiographs - Part 3: Image quality values (ISO
13232-3:2025)
Zerstörungsfreie Prüfung - Bildgüte von Durchstrahlungsaufnahmen - Teil 3: Werte für
die Bildqualität (ISO 19232-3:2025)
Essais non destructifs - Qualité d'image des radiogrammes - Partie 3: Indices de qualité
d'image (ISO 13232-3:2025)
Ta slovenski standard je istoveten z: EN ISO 19232-3:2025
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
77.080.01 Železne kovine na splošno Ferrous metals in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 19232-3
EUROPEAN STANDARD
NORME EUROPÉENNE
July 2025
EUROPÄISCHE NORM
ICS 19.100 Supersedes EN ISO 19232-3:2013
English Version
Non-destructive testing - Image quality of radiographs -
Part 3: Minimum image quality values (ISO 19232-3:2025)
Essais non destructifs - Qualité d'image des Zerstörungsfreie Prüfung - Bildgüte von
radiogrammes - Partie 3: Indices de qualité d'image Durchstrahlungsaufnahmen - Teil 3: Werte für die
minimaux (ISO 19232-3:2025) Bildqualität (ISO 19232-3:2025)
This European Standard was approved by CEN on 6 July 2025.

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
© 2025 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 19232-3:2025 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
This document (EN ISO 19232-3:2025) has been prepared by Technical Committee ISO/TC 135 "Non-
destructive testing " in collaboration with Technical Committee CEN/TC 138 “Non-destructive testing”
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 2026, and conflicting national standards shall
be withdrawn at the latest by January 2026.
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.
This document supersedes EN ISO 19232-3:2013.
Any feedback and questions on this document should be directed to the users’ national standards
body/national committee. 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 19232-3:2025 has been approved by CEN as EN ISO 19232-3:2025 without any
modification.
International
Standard
ISO 19232-3
Third edition
Non-destructive testing — Image
2025-07
quality of radiographs —
Part 3:
Minimum image quality values
Essais non destructifs — Qualité d’image des radiogrammes —
Partie 3: Indices de qualité d’image minimaux
Reference number
ISO 19232-3:2025(en) © ISO 2025

ISO 19232-3:2025(en)
© ISO 2025
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 19232-3:2025(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Image quality values . 2
4.1 Single-wall radiography .2
4.2 Double-wall radiography .2
5 Arrangement of IQI . 3
6 Determination of image quality value . 3
7 Reduction of minimum image quality values for gamma radiography . 3
8 Requirements for minimum IQI values . 4
8.1 General .4
8.2 Minimum IQI values for single-wall radiographic techniques; IQI on source side.4
8.3 Minimum IQI values for double-wall radiographic techniques; double-image evaluation
(DWDI); IQI on source side .6
8.4 Minimum IQI values for double-wall radiographic techniques; single-image (DWSI) or
double-image (DWDI) evaluation; IQI on detector side .8

iii
ISO 19232-3:2025(en)
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).
ISO draws attention to the possibility that the implementation of this document may involve the use of (a)
patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed patent
rights in respect thereof. As of the date of publication of this document, ISO had not received notice of (a)
patent(s) which may be required to implement this document. However, implementers are cautioned that
this may not represent the latest information, which may be obtained from the patent database available at
www.iso.org/patents. ISO shall not be held responsible for identifying any or all such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of 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 www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 135, Non-destructive testing, Subcommittee
SC 5, Radiographic testing, in collaboration with the European Committee for Standardization (CEN)
Technical Committee CEN/TC 138, Non-destructive testing, in accordance with the Agreement on technical
cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 19232-3:2013), which has been technically
revised.
The main changes are as follows:
— title change from: “image quality classes” to “Minimum image quality values”;
— additions to definitions 3.2 and 3.3;
— renamed Clause 4 “Image quality values”;
— revision of Clause 7 “Reduction of image quality values for gamma radiography”;
— renamed Clauses 8, 9, 10, 11, 12 and 13 for better readability and traceability;
— updated nominal thickness values for IQI values W2 to W5 in table 1;
— updated titles of all tables for better readability and traceability;
— editorial changes.
A list of all parts in the ISO 19232 series can be found on the ISO website.
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
International Standard ISO 19232-3:2025(en)
Non-destructive testing — Image quality of radiographs —
Part 3:
Minimum image quality values
1 Scope
This document specifies the minimum image quality values (using IQIs) to ensure a uniform radiographic
image quality. This document specifies the minimum IQI values for the two testing classes, A and B, of
radiographic techniques as specified in ISO 5579. This document is applicable to the two types of image
quality indicators as detailed in ISO 19232-1 for wire-type IQIs and ISO 19232-2 for step/hole-type IQIs, and
for the two testing, classes A and B, as specified in ISO 5579.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes
requirements of this document. For dated references, only the edition cited applies. For undated references,
the latest edition of the referenced document (including any amendments) applies.
ISO 5579, Non-destructive testing — Radiographic testing of metallic materials using film and X- or gamma rays
— Basic rules
ISO 5580, Non-destructive testing — Industrial radiographic illuminators — Minimum requirements
ISO 17636 (all parts), Non-destructive testing of welds — Radiographic testing
ISO 19232-1, Non-destructive testing — Image quality of radiographs — Part 1: Determination of the image
quality value using wire-type image quality indicators
ISO 19232-2, Non-destructive testing — Image quality of radiographs — Part 2: Determination of the image
quality value using step/hole-type image quality indicators
3 Terms and definitions
For the purposes of this document, the terms and definitions given in ISO 5579 and the following apply.
ISO and IEC maintain terminology databases for use in standardizatio
...