EN ISO 6980-2:2025

SLOVENSKI STANDARD
01-julij-2025
Jedrska energija - Referenčno sevanje delcev beta - 2. del: Osnove kalibracije,
povezane z osnovnimi veličinami, ki označujejo polje sevanja (ISO 6980-2:2023)
Nuclear energy - Reference beta-particle radiation - Part 2: Calibration fundamentals
related to basic quantities characterizing the radiation field (ISO 6980-2:2023)
Énergie nucléaire - Rayonnement bêta de référence - Partie 2: Concepts d'étalonnage
en relation avec les grandeurs fondamentales caractérisant le champ de rayonnement
(ISO 6980-2:2023)
Ta slovenski standard je istoveten z: prEN ISO 6980-2
ICS:
17.240 Merjenje sevanja Radiation measurements
27.120.01 Jedrska energija na splošno Nuclear energy in general
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6980-2
ISO/TC 85/SC 2
Nuclear energy — Reference beta-
Secretariat: AFNOR
particle radiation —
Voting begins on:
2023-08-30
Part 2:
Voting terminates on:
Calibration fundamentals related to
2023-10-25
basic quantities characterizing the
radiation field
Énergie nucléaire — Rayonnement bêta de référence —
Partie 2: Concepts d'étalonnage en relation avec les grandeurs
fondamentales caractérisant le champ du rayonnement
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 SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6980-2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

ISO/FDIS 6980-2:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 6980-2
ISO/TC 85/SC 2
Nuclear energy — Reference beta-
Secretariat: AFNOR
particle radiation —
Voting begins on:
Part 2:
Voting terminates on:
Calibration fundamentals related to
basic quantities characterizing the
radiation field
Énergie nucléaire — Rayonnement bêta de référence —
Partie 2: Concepts d'étalonnage en relation avec les grandeurs
fondamentales caractérisant le champ du rayonnement
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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or ISO’s member body in the country of the requester.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: +41 22 749 01 11
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: copyright@iso.org
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 6980-2:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
NATIONAL REGULATIONS. © ISO 2023

ISO/FDIS 6980-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms and reference and standard test conditions .3
5 Calibration and traceability of reference radiation fields . 6
6 General principles for calibration of radionuclide beta‑particle fields .6
6.1 General . 6
6.2 Scaling to derive equivalent thicknesses of various materials . 7
6.3 Characterization of the radiation field in terms of penetrability. 8
7 Calibration procedures using an extrapolation chamber . 8
7.1 General . 8
7.2 Determination of the reference beta-particle absorbed-dose rate . 9
8 Calibration with ionization chambers .10
9 Measurements at non-perpendicular incidence .10
10 Uncertainties .10
Annex A (normative) Reference conditions and standard test conditions .19
Annex B (informative) Extrapolation chamber measurements .21
Annex C (informative) Extrapolation chamber measurement correction factors .25
Annex D (informative) Example of an uncertainty analysis .37
Bibliography .41
iii
ISO/FDIS 6980-2:2023(E)
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 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
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expressions related to conformity assessment, as well as information about ISO's adherence to
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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 2, Radiological protection.
This third edition of ISO 6980-2 cancels and replaces ISO 6980-2:2022, of which it constitutes a minor
revision.
The main changes are as follows:
— editorial changes throughout the document.
A list of all the parts in the ISO 6980 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
ISO/FDIS 6980-2:2023(E)
Introduction
ISO 6980 series covers the production, calibration, and use of beta-particle reference radiation fields for
the calibration of dosemeters and dose-rate meters for protection purposes. This document describes
the procedures for the determination of absorbed dose rate to a reference depth of tissue from beta
particle reference radiation fields. ISO 6980-1 describes methods of production and characterization of
the reference radiation. ISO 6980-3 describes procedures for the calibration of dosemeters and dose-
rate meters and the determination of their response as a function of beta-particle energy and angle of
beta-particle incidence.
For beta particles, the calibration and the determination of the response of dosemeters and dose-rate
meters is essentially a three-step process. First, the basic field quantity, absorbed dose to tissue
at a depth of 0,07 mm (and optionally also at a depth of 3 mm) in a tissue-equivalent slab geometry
is measured at the point of test, using methods described in this document. Then, the appropriate
operational quantity is derived by the application of a conversion coefficient that relates the quantity
measured (reference absorbed dose) to the selected operational quantity for the selected irradiation
geometry. Finally, the reference point of the device under test is placed at the point of test for the
calibration and determination of the response of the dosemeter. Depending on the type of dosemeter
under test, the irradiation is either carried out on a phantom or free-in-air for personal and area
dosemeters, respectively. For individual and area monitoring, this document describes the methods and
the conversion coefficients to be used for the determination of the response of dosemeters and dose-
rate meters in terms of the ICRU operational quantities, i.e., directional dose equivalent, H′(0,07;Ω) and
H′(3;Ω), as well as personal dose equivalent, H (0,07) and H (3).
p p
v
FINAL DRAFT INTERNATIONAL STANDARD ISO/FDIS 6980-2:2023(E)
Nuclear energy — Reference beta-particle radiation —
Part 2:
Calibration fundamentals related to basic quantities
characterizing the radiation field
1 Scope
This document specifies methods for the measurement of the absorbed-dose rate in a tissue-equivalent
slab phantom in the ISO 6980 reference beta-particle radiation fields. The energy range of the beta-
particle-emitting isotopes covered by these reference radiations is 0,22 MeV to 3,6 MeV maximum
beta energy corresponding to 0,07 MeV to 1,2 MeV mean beta energy. Radiation energies outside
this range are beyond the scope of this document. While measurements in a reference geometry
(depth of 0,07 mm or 3 mm at perpendicular incidence in a tissue-equivalent slab phantom) with an
extrapolation chamber used as primary standard are dealt with in detail, the use of other measurement
systems and measurements in other geometries are also described, although in less detail. However,
[5]
as noted in ICRU 56 , the ambient dose equivalent, H*(10), used for area monitoring, and the personal
dose equivalent, H (10), as used for individual monitoring, of strongly penetrating radiation, are not
p
appropriate quantities for any beta radiation, even that which penetrates 10 mm of tissue (E > 2 MeV).
max
This document is intended for those organizations wishing to establish primary dosimetry capabilities
for beta particles and serves as a guide to the performance of dosimetry with an extrapolation chamber
used as primary standard for beta-particle dosimetry in other fields. Guidance is also provided on the
statement of measurement uncertainties.
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 docu
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