prEN ISO 19232-1

• Abstract:

  This document specifies a device and a method for the determination of the image quality of radiographs using wire-type image quality indicators.

• Status: Not Published
• Publication Date: 24-Jan-2028
• ICS: 19.100 - Non-destructive testing
• Technical Committee: CEN/TC 138 - Non-destructive testing
• Drafting Committee: CEN/TC 138/WG 1 - Ionizing radiation testing
• Current Stage: 4060 - Closure of enquiry - Enquiry
• Start Date: 27-Oct-2026
• Completion Date: 27-Oct-2026
• Ref Project: oSIST prEN ISO 19232-1:2026 - Non-destructive testing - Image quality of radiographs - Part 1: Determination of the image quality value using wire-type image quality indicators (ISO/DIS 19232-1:2026)

• Revises: EN ISO 19232-1:2013 - Non-destructive testing - Image quality of radiographs - Part 1: Determination of the image quality value using wire-type image quality indicators (ISO 19232-1:2013)
• Effective Date: 09-Jun-2024

prEN ISO 19232-1 is a CEN draft standard for non-destructive testing that specifies a wire-type image quality indicator and the method for determining the image quality value of radiographs. It is intended for people who make, inspect, or accept radiographs in industrial radiography, where the visible detail on the image has to be checked against a defined IQI. The document focuses on how the IQI is built, selected, placed, marked, and read.

What does prEN ISO 19232-1 specify?

prEN ISO 19232-1 specifies the wire-type IQI system and the method for using it to determine image quality on radiographs. It is organized into scope, terms and definitions, IQI specification, use of IQIs, and determination of image quality value, plus one informative annex.

Annex	What it covers
Annex A	Guidance for converting ASTM E747 standard wire identities to the wire numbers used in this part

The scope is limited to wire-type IQIs. The rest of the ISO 19232 series covers other image quality topics such as step/hole-type indicators, minimum image quality values, experimental evaluation, and duplex wire-type indicators.

What are the key requirements of prEN ISO 19232-1?

prEN ISO 19232-1 gives the main rules for the IQI itself, how to choose it for a material, how to place it, and how to read the result. In practice, these rules determine whether the radiograph can be accepted as having enough visible detail.

IQI design and designation

Clause 4.1 defines a wire-type IQI built from 22 wires with different diameters, grouped into overlapping sets from W 1 to W 22. The wires are parallel, and the available wire lengths are 10 mm, 25 mm, or 50 mm. The designation includes IQI, the document number, the thickest wire number, the wire material symbol, and the length, so users can identify exactly which indicator was used.

Material and envelope

Clause 4.2 requires all wires in one IQI to be of the same material and enclosed in a protective envelope that does not affect image quality. The envelope attenuation must not exceed 50% of the attenuation of the finest wire in the set. In practice, this means the cover must protect the IQI without hiding the image detail that the test is meant to reveal.

Marking and conformity

Clause 4.3 specifies the marking on the IQI: the number of the thickest wire, the wire material letters, and the ISO letters. The radiographic image of the identification must not create glare, so the marking must remain readable without disturbing the radiograph. Clause 4.4 requires a declaration of conformity according to ISO/IEC 17050-1 and producer numbering and marking for identification and traceability.

Selection for the object under test

Clause 5.1 says the IQI is selected according to the material under test and the image quality value expected or required. The wire material should have attenuation as close as possible to the test object, and Table 2 links IQI types such as CU, FE, TI, and AL to suitable material groups. This matters because the indicator has to behave similarly to the part being radiographed.

Arrangement on the object

Clause 5.2 places the IQI on the source side of the section under test and away from the detector unless the application standard says otherwise. If that placement is not possible, the IQI may be placed next to the detector side, and the radiograph must then show an F image near the IQI marking. The IQI should also be on a zone of uniform thickness, which helps keep the result comparable from one radiograph to the next.

Determining the image quality value

Clause 6 says the viewing conditions in ISO 5580 for film radiographs or ISO 17636-2 for digital radiography shall be observed. The image quality value is the number of the thinnest wire that is clearly visible on the radiograph, and a continuous visible length of at least 10 mm is accepted when the application standard does not specify otherwise. The clause also states that verification is generally done for each radiograph, unless the parties agree that repeated images produced under identical conditions do not need individual verification.

What terms does prEN ISO 19232-1 define?

• Image quality - the characteristic of a radiographic image that shows how much detail it reveals.
• Image quality indicator (IQI) - a device with graded elements used to measure image quality on a radiograph.
• Image quality value - the measure based on the thinnest element of the indicator that can still be seen on the radiograph.
• Wire-type image quality indicator - the IQI form used in this part, made from parallel wires of different diameters.
• FE - the wire material symbol used for steel or ferrous material IQIs.
• CU - the wire material symbol used for copper material IQIs.
• TI - the wire material symbol used for titanium material IQIs.
• AL - the wire material symbol used for aluminium material IQIs.

Who uses prEN ISO 19232-1?

prEN ISO 19232-1 is used by non-destructive testing engineers, radiography operators, quality managers, inspectors, and buyers who need to specify or verify radiographic image quality. It is also used by suppliers of IQIs and by contracting parties that need a common way to judge whether a radiograph has adequate detail. The document is relevant wherever radiographic inspection is used on materials grouped in the standard, including ferrous materials, copper, titanium, and aluminium and their alloys.

What changed in prEN ISO 19232-1 from the previous edition?

This third edition cancels and replaces ISO 19232-1:2013. The stated changes are an update of references and definitions, the addition of a finer wire set from W 16 to W 22, an update of the normative references, and editorial revision.

Which standards are used with prEN ISO 19232-1?

prEN ISO 19232-1 is used with related standards that support viewing, conformity, and conversion work:

• ISO 5580 - gives the viewing conditions for film radiographs.
• ISO 17636-2 - gives the viewing conditions for digital radiography.
• ISO/IEC 17050-1 - provides the basis for the declaration of conformity supplied with each IQI.
• ISO 19232-4:2013 - is named for evaluation and for cases where IQIs are used on materials outside the table in this part.
• ASTM E747 - is the basis for the conversion guidance in Annex A.
• EN 462-1 - is treated as identical in designation to ISO 19232-1 IQIs.
• ISO 19232-2, ISO 19232-3, ISO 19232-4, ISO 19232-5 - are the other parts of the ISO 19232 series on radiographic image quality.

What does the prEN ISO 19232-1 document contain?

The document contains the IQI layout figure, the designation rules, and tables of wire numbers, diameters, tolerances, materials, and ASTM E747 equivalences. It also includes the selection guidance for matching IQIs to material groups and the placement rules for source-side or detector-side use. Annex A gives conversion guidance for ASTM E747 wire identities, which is useful when old or mixed IQI systems are encountered during testing or acceptance work.

SLOVENSKI STANDARD
01-oktober-2026
Neporušitveno preskušanje - Kakovost radiografske slike - 1. del: Ugotavljanje
stopnje kakovosti slike z uporabo žičnih indikatorjev kakovosti slike (ISO/DIS
19232-1:2026)
Non-destructive testing - Image quality of radiographs - Part 1: Determination of the
image quality value using wire-type image quality indicators (ISO/DIS 19232-1:2026)
Zerstörungsfreie Prüfung - Bildgüte von Durchstrahlungsaufnahmen - Teil 1: Ermittlung
der Bildgütezahl mit Draht-Typ-Bildgüteprüfkörpern (ISO/DIS 19232-1:2026)
Essais non destructifs - Qualité d'image des radiogrammes - Partie 1: Détermination de
l'indice de qualité d'image à l'aide d'indicateurs à fils (ISO/DIS 19232-1:2026)
Ta slovenski standard je istoveten z: prEN ISO 19232-1
ICS:
19.100 Neporušitveno preskušanje Non-destructive testing
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
International
Standard
ISO/DIS 19232-1
ISO/TC 135/SC 5
Non-destructive testing — Image
Secretariat: DIN
quality of radiographs —
Voting begins on:
Part 1: 2026-08-04
Determination of the image quality
Voting terminates on:
2026-10-27
value using wire-type image quality
indicators
Essais non destructifs — Qualité d'image des radiogrammes —
Partie 1: Détermination de l'indice de qualité d'image à l'aide
d'indicateurs à fils
ICS: 19.100
THIS DOCUMENT IS A DRAFT CIRCULATED
FOR COMMENTS AND APPROVAL. IT
IS THEREFORE SUBJECT TO CHANGE
AND MAY NOT BE REFERRED TO AS AN
INTERNATIONAL STANDARD UNTIL
PUBLISHED AS SUCH.
This document has not been edited by the ISO Central Secretariat.
IN ADDITION TO THEIR EVALUATION AS
BEING ACCEPTABLE FOR INDUSTRIAL,
TECHNOLOGICAL, COMMERCIAL AND
USER PURPOSES, DRAFT INTERNATIONAL
STANDARDS MAY ON OCCASION HAVE TO
ISO/CEN PARALLEL PROCESSING
BE CONSIDERED IN THE LIGHT OF THEIR
POTENTIAL TO BECOME STANDARDS TO
WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS.
RECIPIENTS OF THIS DRAFT ARE INVITED
TO SUBMIT, WITH THEIR COMMENTS,
NOTIFICATION OF ANY RELEVANT PATENT
RIGHTS OF WHICH THEY ARE AWARE AND TO
PROVIDE SUPPORTING DOCUMENTATION.
Reference number
ISO/DIS 19232-1:2026(en)
ISO/DIS 19232-1:2026(en)
© ISO 2026
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.
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Published in Switzerland
ii
ISO/DIS 19232-1:2026(en)
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Specification for wire-type image quality indicators . 1
4.1 Dimensions, designation .1
4.2 Material .2
4.3 Marking of IQI .3
4.4 Declaration of conformity .3
5 Use of image quality indicators . 4
5.1 Selection .4
5.2 Arrangement .5
6 Determination of image quality value . 5
[2]
Annex A (informative) Guidance for conversion of the ASTM E747 standard wire identities . 6
Bibliography . 7

iii
ISO/DIS 19232-1:2026(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.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
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.
ISO 19232-1 was prepared by the European Committee for Standardization (CEN) in collaboration with ISO
Technical Committee TC 135, Non-destructive testing, Subcommittee SC 5, Radiation methods, in accordance
with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This third edition cancels and replaces the second edition (ISO 19232-1:2013), of which it constitutes a minor
revision with the following changes:
— update of references and definitions;
— addition of a new finer wire set W 16 to W 22;
— update of the normative references;
— editorial update.
ISO 19232 consists of the following parts under the general title Non-destructive testing — Image quality of
radiographs:
— Part 1: Determination of the image quality value using wire-type image quality indicators
— Part 2: Determination of the image quality value using step/hole-type image quality indicators
— Part 3: Minimum image quality values
— Part 4: Experimental evaluation of image quality values and image quality tables
— Part 5: Determination of the image unsharpness value using duplex wire-type image quality indicators

iv
DRAFT International Standard ISO/DIS 19232-1:2026(en)
Non-destructive testing — Image quality of radiographs —
Part 1:
Determination of the image quality value using wire-type
image quality indicators
1 Scope
This document specifies a device and a method for the determination of the image quality of radiographs
using wire-type image quality indicators.
2 Normative references
There are no normative references in this document.
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at https:// www .el
...