IEC 60405:2003

Nuclear instrumentation - Constructional requirements and classification of radiometric gauges

Specifies constructional requirements for the design of instruments and the radiation protection to be provided in the case of radiometric gauges. Special attention is drawn to the stability of the source housing in the event of fire.

Instrumentation nucléaire - Prescriptions de construction et classification pour les jauges de mesure des rayonnements ionisants

Spécifie les prescriptions de construction concernant la conception de l'instrument et la radioprotection à mettre en oeuvre dans le cas de jauges radiométriques. Une attention spéciale est portée à la stabilité du boîtier de la source en cas d'incendie.

General Information

• Status: Replaced
• Publication Date: 28-Apr-2003
• ICS: 27.120.01 - Nuclear energy in general
• Technical Committee: TC 45 - Nuclear instrumentation
• Drafting Committee: WG 6 - TC 45/WG 6
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 30-Mar-2011

Relations

• Replaced By: IEC 62598:2011 - Nuclear instrumentation - Constructional requirements and classification of radiometric gauges
• Effective Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL ���
STANDARD �����
Second edition
2003-04
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Reference number
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INTERNATIONAL ���
STANDARD �����
Second edition
2003-04
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� IEC 2003 � Copyright - all rights reserved
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 the publisher.
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– 2 – 60405 � IEC:2003(E)
CONTENTS
FOREWORD.4
INTRODUCTION .5
1 Scope and object .6
2 Normative references.6
3 Definitions .7
4 Classification of radiometric gauge types.8
4.1 Category A: Radiometric gauges with restricted beam .8
4.2 Category B: radiometric gauges with omnidirectional beam .8
4.3 Radiation protection classes .9
4.4 Temperature class .9
5 General requirements .10
5.1 Measuring gap.10
5.2 Source holder .10
5.3 Source housing.10
5.4 Alignment of the useful beam.10
5.5 Other requirements.10
6 Protection against ionizing radiation .11
6.1 General requirements .11
6.2 Requirements for Category A gauges .11
6.3 Requirements for Category B gauges .11
6.4 Resistance of the source housing in case of fire.11
6.5 Detector housing.11
6.6 Measuring head .11
7 Other safety devices .12
7.1 General .12
7.2 Protection against non-authorized use.12
7.3 Indication of the shutter position.12
7.4 Additional warning device.12
8 Determination of the dose equivalent rate.12
8.1 General .12
8.2 Dose equivalent rate measurements in the case of closed shutters .14
8.3 Dose equivalent rate measurements in the case of open shutters.14
8.4 Procedure for dose equivalent rate measurements .14
8.5 Determining the relevant values of the dose equivalent rate .14
9 Test methods.14
9.1 General .14
9.2 Temperature cycle test on the shutters and the source holder .15
9.3 Test for checking the resistance of the shutter and the source holder
in case of fire.16
9.4 Test for checking the mechanical resistance of the shutter and
the source holder.16
10 System classification coding and labelling .16
10.1 Classification code.16
10.2 Labelling.17
11 Accompanying documents.17

60405 � IEC:2003(E) – 3 –
Figure 1 – Schematic arrangement of Category A gauges .8
Figure 2 – Schematic arrangement of Category B gauges .9
Figure 3 – Schematic representation of isodistance gauging faces in the case of
thickness gauges .13
Figure 4 – Schematic representation of isodistance gauging faces in the case of level
and density gauges and back-scatter gauges.13
Table 1 – Radiation protection classes .9
Table 2 – Temperature classes .9

– 4 – 60405 � IEC:2003(E)
INTERNATIONAL ELECTROTECHNICAL COMMISSION
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FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
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equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60405 has been prepared by IEC technical committee 45: Nuclear
instrumentation.
This second edition cancels and replaces the first edition published in 1972. This edition
constitutes a technical revision.
The text of this standard is based on the following documents:
FDIS Report on voting
45/519/FDIS 45/525/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.
The committee has decided that the contents of this publication will remain unchanged until 2006.
At this date, the publication will be
reconfirmed;
withdrawn;
replaced by a revised edition, or
amended.
A bilingual edition of this standard may be issued at a later date.

60405 � IEC:2003(E) – 5 –
INTRODUCTION
This International Standard is based on ISO 7205 which was published in 1986. It includes
excerpts of the requirements specified in ISO 7205 and modifies or supplements them with
additional provisions, where required by current needs.
Compared to the first edition of IEC 60405 published in 1972, the following major alterations
have been made:
a) the original classification of gauges in accordance with the activity of the radioactive source
has been replaced by a system-oriented and application-oriented classification in accord-
ance with the alignment of the useful beam, the dose equivalent rate (radiation protection
classes) and the permissible operating temperature (temperature classes);
b) safety-relevant requirements and appropriate test methods on the basis of ISO 7205 have
been introduced and worded more precisely;
c) a gauge classification system has been introduced (in line with ISO 7205) with a view to
reaching compatibility with international provisions.

– 6 – 60405 � IEC:2003(E)
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This standard applies to the manufacture and installation of electrical measuring systems and
instruments utilizing radioactive sources (radiometric gauges, hereinafter called gauges).
It does not apply to portable gauges which, because of their construction and purposes for use,
are intended to be operated as mobile equipment and it does not apply to gauges operated with
X-ray tubes, but it can be analogously applicable to these gauges.
The purpose of this standard is to specify constructional requirements for the design of
instruments and the radiation protection to be provided in the case of radiometric gauges.
In this context, special attention is attached to the stability of the source housing in the event
of fire.
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The following referenced documents are indispensable for the application 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.
IEC 61010-1:2001, �������������������������������������������������������������������������
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IEC 60405
Edition 2.0 2003-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear instrumentation – Constructional requirements and classification of
radiometric guages
Instrumentation nucléaire – Prescriptions de construction et classification pour
les jauges de mesure des rayonnements ionisants

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IEC 60405
Edition 2.0 2003-04
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Nuclear instrumentation – Constructional requirements and classification of
radiometric guages
Instrumentation nucléaire – Prescriptions de construction et classification pour
les jauges de mesure des rayonnements ionisants

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
R
CODE PRIX
ICS 27.120 ISBN 2-8318-7232-4
– 2 – 60405  CEI:2003
SOMMAIRE
AVANT-PROPOS . 6
INTRODUCTION .10
1 Domaine d'application.12
2 Références normatives .12
3 Définitions .14
4 Classification des types de jauges radiométriques .16
4.1 Catégorie A: Jauges radiométriques avec faisceau collimaté .16
4.2 Catégorie B: Jauges radiométriques avec faisceau omnidirectionnel .18
4.3 Classification de la protection contre le rayonnement .18
4.4 Classification des températures .18
5 Prescriptions générales .20
5.1 Espace de mesure.20
5.2 Support de source .20
5.3 Boîtier de la source .20
5.4 Alignement du faisceau utile .20
5.5 Autres prescriptions.22
6 Protection contre les rayonnements ionisants .22
6.1 Prescriptions générales .22
6.2 Prescriptions pour les jauges de Catégorie A.22
6.3 Prescriptions pour les jauges de Catégorie B.22
6.4 Résistance du boîtier de la source en cas d'incendie .24
6.5 Boîtier du détecteur .24
6.6 Tête de mesure .24
7 Autres appareils de sécurité .24
7.1 Généralités.24
7.2 Protection contre une utilisation non autorisée.24
7.3 Indication sur la position de l'obturateur.24
7.4 Dispositif d’avertissement additionnel .24
8 Détermination du débit d’équivalent de dose.26
8.1 Généralités.26
8.2 Mesure du débit d’équivalent de dose dans le cas d'obturateurs fermés .28
8.3 Mesure du débit d’équivalent de dose dans le cas d'obturateurs ouverts .28
8.4 Procédure pour les mesures du débit d’équivalent de dose.28
8.5 Détermination des valeurs pertinentes du débit d’équivalent de dose.30
9 Méthodes d'essai.30
9.1 Généralités.30
9.2 Essai de cycle de température sur les obturateurs et le support de source .30
9.3 Essai de résistance de l'obturateur et du support de source en cas
d'incendie .32
9.4 Essai de résistance mécanique de l'obturateur et du support de source.34
10 Code de classification et étiquetage.34
10.1 Code de classification.34
10.2 Etiquetage .36
11 Documents d'accompagnement .36

60405  IEC:2003 – 3 –
CONTENTS
FOREWORD . 7
INTRODUCTION .11
1 Scope and object .13
2 Normative references.13
3 Definitions.15
4 Classification of radiometric gauge types.17
4.1 Category A: Radiometric gauges with restricted beam .17
4.2 Category B: radiometric gauges with omnidirectional beam.19
4.3 Radiation protection classes.19
4.4 Temperature class .19
5 General requirements.21
5.1 Measuring gap .21
5.2 Source holder .21
5.3 Source housing.21
5.4 Alignment of the useful beam .21
5.5 Other requirements .23
6 Protection against ionizing radiation .23
6.1 General requirements .23
6.2 Requirements for Category A gauges .23
6.3 Requirements for Category B gauges .23
6.4 Resistance of the source housing in case of fire .25
6.5 Detector housing.25
6.6 Measuring head .25
7 Other safety devices .25
7.1 General .25
7.2 Protection against non-authorized use.25
7.3 Indication of the shutter position.25
7.4 Additional warning device.25
8 Determination of the dose equivalent rate.27
8.1 General .27
8.2 Dose equivalent rate measurements in the case of closed shutters.29
8.3 Dose equivalent rate measurements in the case of open shutters .29
8.4 Procedure for dose equivalent rate measurements .29
8.5 Determining the relevant values of the dose equivalent rate.31
9 Test methods .31
9.1 General .
...