IEC 62598:2011

Nuclear instrumentation - Constructional requirements and classification of radiometric gauges

IEC 62598:2011 applies to the manufacture and installation of electrical measuring systems and instruments utilizing radioactive sources (radiometric gauges, hereinafter called gauges). It also applies to source housings intended for use in the aforementioned measuring systems. This standard applies to equipment, which is not related to power production or to the fuel cycle. It specifies constructional requirements for the design of instruments utilizing radioactive sources in regard of radiation protection. This standards cancels and replaces IEC 60405.

Instrumentation nucléaire - Exigences de construction et classification pour les jauges radiométriques

La CEI 62598:2011 s'applique à la fabrication et à l'installation des systèmes et appareils de mesure électriques utilisant des sources radioactives (jauges radiométriques, ci-après désignées par jauges, en abrégé). Elle s'applique également aux boîtiers des sources destinées à être utilisées dans les systèmes de mesure mentionnés ci-dessus. Cette Norme s'applique à un équipement, qui n'est pas relié à la production d'électricité nucléaire ou au cycle du combustible nucléaire. Cette Norme spécifie les exigences de construction concernant la conception des instruments utilisant des sources radioactives, eu égard à la protection contre le rayonnement. Cette norme annule et remplace la CEI 60405.

General Information

• Status: Published
• Publication Date: 29-Mar-2011
• ICS: 01 - GENERALITIES. TERMINOLOGY. STANDARDIZATION. DOCUMENTATION
• ICS: 27.120.01 - Nuclear energy in general
• Technical Committee: TC 45 - Nuclear instrumentation
• Current Stage: PPUB - Publication issued
• Start Date: 15-Apr-2011
• Completion Date: 30-Mar-2011

Relations

• Replaces: IEC 60405:2003 - Nuclear instrumentation - Constructional requirements and classification of radiometric gauges
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 62598 ®
Edition 1.0 2011-03
INTERNATIONAL
STANDARD
Nuclear instrumentation – Constructional requirements and classification of
radiometric gauges
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form
or by any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from
either IEC or IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

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International Standards for all electrical, electronic and related technologies.

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IEC 62598 ®
Edition 1.0 2011-03
INTERNATIONAL
STANDARD
Nuclear instrumentation – Constructional requirements and classification of
radiometric gauges
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 27.120 ISBN 978-2-88912-421-3

– 2 – 62598  IEC:2011(E)
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification of radiometric gauge types . 9
4.1 Category A: Radiometric gauges with restricted beam . 9
4.2 Category B: Radiometric gauges with omnidirectional beam . 11
4.3 Category C: Stand alone source housings for fixed radiometric gauges . 11
4.4 Dose rate classes . 12
4.5 Temperature class . 12
5 General requirements . 13
5.1 Measuring gap . 13
5.2 Source holder . 13
5.3 Source housing . 13
5.4 Alignment of the useful beam . 13
5.5 Other requirements . 13
6 Protection against ionizing radiation . 14
6.1 General requirements . 14
6.2 Requirements for Category A gauges . 14
6.3 Requirements for Category B gauges . 14
6.4 Requirements for Category C stand alone source housings . 14
6.5 Resistance of the source housing in case of fire . 15
6.6 Detector housing . 15
6.7 Measuring head . 15
7 Other safety devices . 15
7.1 General . 15
7.2 Protection against non-authorized use . 15
7.3 Indication of the shutter position . 16
7.4 Additional warning device . 16
8 Determination of the dose equivalent rate . 16
8.1 General . 16
8.2 Dose equivalent rate measurements in the case of closed shutters . 18
8.3 Dose equivalent rate measurements in the case of open shutters . 18
8.4 Procedure for dose equivalent rate measurements . 18
8.5 Determining the relevant values of the dose equivalent rate . 19
9 Test methods . 19
9.1 General . 19
9.2 Temperature cycle test on the shutters and the source holder . 19
9.2.1 Requirements . 19
9.2.2 Procedure . 19
9.3 Test for checking the resistance of the shutter, the source holder and the
source container in case of fire . 20
9.3.1 Requirements . 20
9.3.2 Procedure . 20

62598  IEC:2011(E) – 3 –
9.4 Test for checking the mechanical resistance of the shutter and the source
holder . 20
9.4.1 Requirements . 20
9.4.2 Procedure . 21
10 System classification coding and labelling . 21
10.1 Classification code . 21
10.2 Labelling . 22
11 Accompanying documents . 22
Annex A (informative) Guidelines for the installation of radiometric gauges . 23

Figure 1 – Schematic arrangement of Category A gauges . 10
Figure 2 – Schematic arrangement of Category B gauges . 11
Figure 3 – Category C stand alone source housing for fixed level or density gauges . 11
Figure 4 – Schematic representation of isodistance gauging faces in the case of
thickness gauges . 17
Figure 5 – Schematic representation of isodistance gauging faces in the case of level
and density gauges and back-scatter gauges . 17
Figure 6 – Schematic representation of isodistance gauging faces in the case of stand
alone source housings . 18
Figure A.1 – Examples of protection methods and principles . 24

Table 1 – Dose rate classes . 12
Table 2 – Temperature classes . 12
Table 3 – Fire resistance classes . 15

– 4 – 62598  IEC:2011(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR INSTRUMENTATION –
CONSTRUCTIONAL REQUIREMENTS
AND CLASSIFICATION OF RADIOMETRIC GAUGES

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
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indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 62598 has been prepared by IEC technical committee 45: Nuclear
instrumentation.
This standard cancels and replaces the second edition of IEC 60405, issued in 2003. It
constitutes a technical revision (see Introduction).
The text of this standard is based on the following documents:
FDIS Report on voting
45/718/FDIS 45/721/RVD
Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

62598  IEC:2011(E) – 5 –
The committe
...

IEC 62598 ®
Edition 1.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear instrumentation – Constructional requirements and classification of
radiometric gauges
Instrumentation nucléaire – Exigences de construction et classification pour
les jauges radiométriques
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by
any means, electronic or mechanical, including photocopying and microfilm, without permission in writing from either IEC or
IEC's member National Committee in the country of the requester.
If you have any questions about IEC copyright or have an enquiry about obtaining additional rights to this publication,
please contact the address below or your local IEC member National Committee for further information.

Droits de reproduction réservés. Sauf indication contraire, aucune partie de cette publication ne peut être reproduite
ni utilisée sous quelque forme que ce soit et par aucun procédé, électronique ou mécanique, y compris la photocopie
et les microfilms, sans l'accord écrit de la CEI ou du Comité national de la CEI du pays du demandeur.
Si vous avez des questions sur le copyright de la CEI ou si vous désirez obtenir des droits supplémentaires sur cette
publication, utilisez les coordonnées ci-après ou contactez le Comité national de la CEI de votre pays de résidence.

IEC Central Office
3, rue de Varembé
CH-1211 Geneva 20
Switzerland
Email: [e-mail]
Web: www.iec.ch
About the IEC
The International Electrotechnical Commission (IEC) is the leading global organization that prepares and publishes
International Standards for all electrical, electronic and related technologies.

About IEC publications
The technical content of IEC publications is kept under constant review by the IEC. Please make sure that you have the
latest edition, a corrigenda or an amendment might have been published.
 Catalogue of IEC publications: www.iec.ch/searchpub
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It also gives information on projects, withdrawn and replaced publications.
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on-line and also by email.
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The world's leading online dictionary of electronic and electrical terms containing more than 20 000 terms and definitions
in English and French, with equivalent terms in additional languages. Also known as the International Electrotechnical
Vocabulary online.
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IEC 62598 ®
Edition 1.0 2011-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear instrumentation – Constructional requirements and classification of
radiometric gauges
Instrumentation nucléaire – Exigences de construction et classification pour
les jauges radiométriques
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX T
ICS 27.120 ISBN 978-2-88912-422-0

– 2 – 62598  IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope and object . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Classification of radiometric gauge types . 9
4.1 Category A: Radiometric gauges with restricted beam . 9
4.2 Category B: Radiometric gauges with omnidirectional beam . 11
4.3 Category C: Stand alone source housings for fixed radiometric gauges . 11
4.4 Dose rate classes . 12
4.5 Temperature class . 12
5 General requirements . 13
5.1 Measuring gap . 13
5.2 Source holder . 13
5.3 Source housing . 13
5.4 Alignment of the useful beam . 13
5.5 Other requirements . 13
6 Protection against ionizing radiation . 14
6.1 General requirements . 14
6.2 Requirements for Category A gauges . 14
6.3 Requirements for Category B gauges . 14
6.4 Requirements for Category C stand alone source housings . 14
6.5 Resistance of the source housing in case of fire . 15
6.6 Detector housing . 15
6.7 Measuring head . 15
7 Other safety devices . 15
7.1 General . 15
7.2 Protection against non-authorized use . 15
7.3 Indication of the shutter position . 16
7.4 Additional warning device . 16
8 Determination of the dose equivalent rate . 16
8.1 General . 16
8.2 Dose equivalent rate measurements in the case of closed shutters . 18
8.3 Dose equivalent rate measurements in the case of open shutters . 18
8.4 Procedure for dose equivalent rate measurements . 18
8.5 Determining the relevant values of the dose equivalent rate . 19
9 Test methods . 19
9.1 General . 19
9.2 Temperature cycle test on the shutters and the source holder . 19
9.2.1 Requirements . 19
9.2.2 Procedure . 19
9.3 Test for checking the resistance of the shutter, the source holder and the
source container in case of fire . 20
9.3.1 Requirements . 20
9.3.2 Procedure . 20

62598  IEC:2011 – 3 –
9.4 Test for checking the mechanical resistance of the shutter and the source
holder . 20
9.4.1 Requirements . 20
9.4.2 Procedure . 21
10 System classification coding and labelling . 21
10.1 Classification code . 21
10.2 Labelling . 22
11 Accompanying documents . 22
Annex A (informative) Guidelines for the installation of radiometric gauges . 23

Figure 1 – Schematic arrangement of Category A gauges . 10
Figure 2 – Schematic arrangement of Category B gauges . 11
Figure 3 – Category C stand alone source housing for fixed level or density gauges . 11
Figure 4 – Schematic representation of isodistance gauging faces in the case of
thickness gauges . 17
Figure 5 – Schematic representation of isodistance gauging faces in the case of level
and density gauges and back-scatter gauges . 17
Figure 6 – Schematic representation of isodistance gauging faces in the case of stand
alone source housings . 18
Figure A.1 – Examples of protection methods and principles . 24

Table 1 – Dose rate classes . 12
Table 2 – Temperature classes . 12
Table 3 – Fire resistance classes . 15

– 4 – 62598  IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
NUCLEAR INSTRUMENTATION –
CONSTRUCTIONAL REQUIREMENTS
AND CLASSIFICATION OF RADIOMETRIC GAUGES

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,
Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC
Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested
in the subject dealt with may participate in this preparatory work. International, governmental and non-
governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely
with the International Organization for Standardization (ISO) in accordance with conditions determined by
agreement between the two organizations.
2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
consensus of opinion on the relevant subjects since each technical committee has representation from all
interested
...