ISO 16795:2024

Nuclear energy — Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spectrometry

ISO 16795:2024

Name:ISO 16795:2024   Standard name:Nuclear energy — Determination of Gd2O3 content in pellets containing uranium oxide by X-ray fluorescence spectrometry
Standard number:ISO 16795:2024   language:English language
Release Date:21-Apr-2024   technical committee:ISO/TC 85/SC 5 - Nuclear installations, processes and technologies
Drafting committee:ISO/TC 85/SC 5 - Nuclear installations, processes and technologies   ICS number:27.120.30 - Fissile materials and nuclear fuel technology

International
Standard
ISO 16795
Second edition
Nuclear energy — Determination
2024-04
of Gd O content in pellets
2 3
containing uranium oxide by X-ray
fluorescence spectrometry
Énergie nucléaire — Détermination de la teneur de Gd O par
2 3
spectrométrie à fluorescence X dans des pastilles combustibles
contenant de l'oxyde d'uranium
Reference number
© ISO 2024
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Published in Switzerland
ii
Contents Page
Foreword .iv
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Principle . 1
5 Apparatus . 1
6 Reagents . 2
7 Preparation of standards . 2
8 Polishing . 3
9 Equipment calibration . 3
9.1 Angle calibration.3
9.2 Pulse-height distribution .3
9.3 Background correction .3
9.4 Stability (sensitivity) check .3
10 Calibration curve . 4
11 Measurements . 4
12 Precision and accuracy . 4
13 Test report . 4
Annex A (informative) Angle calibration and background correction. 6
Annex B (informative) Precision and accuracy . 7
Bibliography . 8

iii
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,
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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 document 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)
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this may not represent the latest information, which may be obtained from the patent database available at
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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 85, Nuclear energy, nuclear technologies, and
radiological protection, Subcommittee SC 5, Nuclear installations, processes and technologies
This second edition cancels and replaces the first edition (ISO 16795:2004), which has been technically
revised.
The main changes are as follows:
— the title of this document has been modified;
— requirements for the standard pellet has been added in Clause 7;
— range of Gd O content covered by calibration curve has been added in Clause 10;
2 3
A list of all parts in the ISO 16795 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 16795:2024(en)
Nuclear energy — Determination of Gd O content in pellets
2 3
containing uranium oxide by X-ray fluorescence spectrometry
1 Scope
This document specifies a method which covers the determination of Gd O content in UO fuel pellets, by
2 3 2
X-ray fluorescence spectrometry.
Either wave dispersion X-ray fluorescence (WD-XRF) or energy dispersion X-ray fluorescence (ED-XRF) is
applicable, however, this document states a method by using WD-XRF using Gd Lα-line.
This method has been tested for mass fractions of from 2 % to 10 % Gd O .
2 3
2 Normative references
ISO 17034, General requirements for the competence of reference material producers
ASTM C1128, Standard Guide for Preparation of Working Reference Materials for Use in Analysis of Nuclear Fuel
Cycle Materials
3 Terms and definitions
No terms and definitions are listed in this document.
ISO and IEC maintain terminology databases for use in standardization at th
...

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