IEC 61526:2024

IEC 61526 ®
Edition 4.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Measurement of personal dose
equivalents for X, gamma, neutron and beta radiations – Active personal
dosemeters
Instrumentation pour la radioprotection – Mesure des équivalents de dose
individuels pour les rayonnements X, gamma, neutron et bêta – Dosimètres
individuels actifs
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IEC 61526 ®
Edition 4.0 2024-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Measurement of personal dose

equivalents for X, gamma, neutron and beta radiations – Active personal

dosemeters
Instrumentation pour la radioprotection – Mesure des équivalents de dose

individuels pour les rayonnements X, gamma, neutron et bêta – Dosimètres

individuels actifs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 13.280  ISBN 978-2-8322-8176-5

– 2 – IEC 61526:2024 © IEC 2024
CONTENTS
FOREWORD . 7
INTRODUCTION . 9
1 Scope . 10
2 Normative references . 11
3 Terms and definitions . 13
4 Units and symbols . 21
4.1 Units . 21
4.2 Symbols . 21
5 Mechanical characteristics . 23
5.1 Case . 23
5.2 Switches . 23
6 General characteristics . 24
6.1 Storage of dose information . 24
6.2 Indication . 24
6.3 Dosemeter markings . 24
6.4 Retention of radioactive contamination. 24
6.5 Ranges for dose and dose rate . 24
6.6 Rated range of an influence quantity . 24
6.7 Effect of radiation not intended to be measured and use of more than one
dosemeter . 25
6.8 Intrinsic and environmental background of the instrument . 25
6.9 Dose or dose rate alarms . 25
6.9.1 General . 25
6.9.2 Dose alarms . 25
6.9.3 Dose rate alarms . 25
6.9.4 Alarm output . 26
6.10 Indication of malfunction . 26
6.11 Assignment of the dose value to the dosemeter . 26
6.12 Algorithm to evaluate the indicated value . 26
7 General test procedures . 26
7.1 Nature of tests . 26
7.2 Reference conditions and standard test conditions . 27
7.3 Tests for influence quantities of type F . 28
7.4 Tests for influence quantities of type S . 28
7.5 Phantom for testing . 28
7.6 Position of detector assembly for the purpose of testing. 28
7.7 Position of dosemeter during use . 28
7.8 Minimum rated range of influence quantity . 29
7.9 Low dose rates . 29
7.10 Statistical fluctuations . 29
7.11 Production of reference radiation . 29
8 Additivity of indicated value . 29
8.1 Requirements . 29
8.2 Method of test . 30
8.2.1 General . 30
8.2.2 Preparation of the test . 30

8.2.3 Practical test . 31
8.3 Interpretation of the results . 31
9 Radiation performance requirements and tests . 31
9.1 General . 31
9.2 Consideration of the uncertainty of the conventional quantity value . 32
9.3 Constancy of the dose response, dose rate dependence and statistical
fluctuations . 32
9.3.1 General . 32
9.3.2 Requirements . 32
9.3.3 Method of test using sources . 37
9.3.4 Interpretation of the results of the test using sources . 38
9.3.5 Method of test for photon dosemeters using natural radiation . 39
9.3.6 Interpretation of the results of the test using natural radiation . 39
9.4 Variation of the response due to photon radiation energy and angle of
incidence . 40
9.4.1 Measurement quantity H (0,07) or Ḣ (0,07) . 40
p p
9.4.2 Measurement quantity H (3) or Ḣ (3) . 40
p p
9.4.3 Measurement quantity H (10) or Ḣ (10) . 41
p p
9.5 Variation of the response due to neutron radiation energy and angle of
incidence . 42
9.5.1 General . 42
9.5.2 Measurement quantity H (10) or Ḣ (10) . 42
p p
9.6 Variation of the response due to beta radiation energy and angle of
incidence . 43
9.6.1 General . 43
9.6.2 Measurement quantity H (0,07) or Ḣ (0,07) . 43
p p
9.6.3 Measurement quantity H (3) or Ḣ (3) . 44
p p
9.6.4 Measurement quantity H (10) or Ḣ (10) . 45
p p
9.7 Over indication due to radiation incident from the side of an H (10), H (3) or
p p
H (0,07) dosemeter . 45
p
9.7.1 Requirements . 45
9.7.2 Method of test. 45
9.7.3 Interpretation of the results . 46
9.8 Retention of dose reading . 46
9.8.1 General . 46
9.8.2 Requirements . 46
9.8.3 Method of test and interpretation of the results . 46
9.9 Overload characteristics . 46
9.9.1 General . 46
9.9.2 Requirements . 47
9.9.3 Method of test and interpretation of the results . 47
9.10 Alarm . 48
9.10.1 General . 48
9.10.2 Response time for dose rate indication and alarm . 48
9.10.3 Accuracy of dose alarm . 49
9.10.4 Accuracy of dose rate alarm . 49
9.11 Model function . 50
10 Electrical and environmental performance requirements and tests . 50

– 4 – IEC 61526:2024 © IEC 2024
10.1 General . 50
10.2 Power supplies . 50
10.2.1 General requirements . 50
10.2.2 Specific primary batteries requirements . 51
10.2.3 Specific secondary batteries requirements . 51
10.2.4 Method of test and interpretation of the results (primary and
secondary batteries) . 51
10.3 Ambient temperature. 52
10.3.1 Requirements . 52
10.3.2 Method of test and interpretation of the results . 53
10.4 Relative humidity . 54
10.4.1 Requirements . 54
10.4.2 Method of test and interpretation of the results . 54
10.5 Atmospheric pressure . 54
10.6 Sealing . 54
10.7 Storage . 54
10.8 Light exposure . 54
10.8.1 General . 54
10.8.2 Requirements . 55
10.8.3 Interpretation of the results . 55
10.9 Dose build-up, fading and self-irradiation (hybrid dosemeters) . 55
11 Electromagnetic performance requirements and tests . 56
11.1 General . 56
11.2 Electrostatic discharge . 57
11.2.1 Requirements . 57
11.2.2 Method of test and interpretation of the results . 57
11.3 Radiated electromagnetic fields . 58
11.3.1 Requirements . 58
11.3.2 Method of test and interpretation of the results . 58
11.4 Conducted disturbances induced by fast transients or bursts . 58
11.4.1 Requirements . 58
11.4.2 Method of test and interpretation of the results . 58
11.5 Conducted disturbances induced by surges . 59
11.5.1 Requirements . 59
11.5.2 Method of test and interpretation of the results . 59
11.6 Conducted disturbances induced by radio-frequencies . 59
11.6.1 Requirements . 59
11.6.2 Method of test and interpretation of the results . 59
11.7 50 Hz/60 Hz magnetic field . 59
11.7.1 Requirements . 59
11.7.2 Method of test and interpretation of the results . 59
11.8 Voltage dips and short interruptions . 59
11.8.1 Requirements . 59
11.8.2 Method of test and interpretation of the results . 60
12 Mechanical performance, requirements and tests . 60
12.1 General . 60
12.2 Drop test . 60
12.2.1 Requirements . 60
12.2.2 Method of test and interpretation of the results . 60

12.3 Vibration test . 61
12.3.1 Requirements . 61
12.3.2 Method of test and interpretation of the results . 61
12.4 Microphonics test . 61
12.4.1 Requirements . 61
12.4.2 Method of test and interpretation of the results . 61
13 Software . 62
13.1 General . 62
13.2 Design and structure of the software . 63
13.2.1 Requirements . 63
13.2.2 Method of test. 63
13.3 Identification of the software . 63
13.3.1 Requirements . 63
13.3.2 Method of test. 63
13.4 Authenticity of the software and the presentation of results . 64
13.4.1 Requirements . 64
13.4.2 Method of test. 64
13.5 Alarm and stop of system operation under abnormal operating conditions . 64
13.5.1 Requirements . 64
13.5.2 Method of test. 64
13.6 Control of instrument parameters . 65
13.6.1 Requirements . 65
13.6.2 Method of test. 65
13.7 Storage of measurement data . 65
13.7.1 Requirements . 65
13.7.2 Method of test. 65
13.8 Transmission of data . 66
13.8.1 Requirements . 66
13.8.2 Method of test. 66
13.9 Hardware interfaces and software interfaces . 66
13.9.1 Requirements . 66
13.9.2 Method of test. 67
13.10 Documentation for the software test . 67
13.10.1 Requirements . 67
13.10.2 Method of test. 67
14 Uncertainty . 68
15 Documentation . 68
15.1 Type test report . 68
15.2 Certificate . 68
16 Operation and maintenance manual . 69
Annex A (normative) Statistical fluctuations . 70
Annex B (normative) Coverage intervals . 72
B.1 General . 72
x
B.2 Coverage interval for the mean, . 73
B.3 Coverage interval for a combined quantity . 73
Annex C (informative) Causal connection between readout signals, indicated value
and measured value . 75

– 6 – IEC 61526:2024 © IEC 2024
Annex D (informative) Procedure to determine the variation of the relative response
due to radiation energy and angle of radiation incidence . 76
Annex E (informative) Computational method of test for mixed irradiations . 78
Bibliography . 80

Figure B.1 – Test for coverage interval . 72
Figure C.1 – Data evaluation in dosimetry systems . 75
Figure E.1 – Flow chart of a computer program to perform tests according to 8.2 . 79

Table 1 – Symbols and abbreviated terms . 21
Table 2 – Reference conditions and standard test conditions . 27
Table 3 – Radiation characteristics of H (0,07) dosemeters for X, gamma and beta
p
radiation . 33
Table 4 – Radiation characteristics of H (3) dosemeters for X, gamma and beta
p
radiation . 34
Table 5 – Radiation characteristics of H (10) dosemeters for X and gamma radiation . 35
p
Table 6 – Radiation characteristics of H (10) dosemeters for neutron radiation . 36
p
Table 7 – Values of c and c for w different dose values and n indications for each
1 2
dose value . 39
Table 8 – Electrical and environmental characteristics of dosemeters . 55
Table 9 – Electromagnetic disturbance characteristics of dosemeters . 57
Table 10 – Mechanical disturbances characteristics of dosemeters . 60
Table A.1 – Number of instrument readings required to detect true differences (95 %

level of confidence) between two sets of instrument readings on the same instrument . 71
Table B.1 – Student’s t-value for a double sided 95 % coverage interval . 73
Table E.1 – Example of dosemeter response table and range limits . 78

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION –
MEASUREMENT OF PERSONAL DOSE EQUIVALENTS FOR X,
GAMMA, NEUTRON AND BETA RADIATIONS –
ACTIVE PERSONAL DOSEMETERS
FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
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co-operation on all questions concerning standardization in the electrical and electronic fields. To this end and
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6) All users should ensure that they have the latest edition of this publication.
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) IEC draws attention to the possibility that the implementation of this document may involve the use of (a)
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respect thereof. As of the date of publication of this document, IEC had not received notice of (a) patent(s), which
may be required to implement this document. However, implementers are cautioned that this may not represent
the latest information, which may be obtained from the patent database available at https://patents.iec.ch. IEC
shall not be held responsible for identifying any or all such patent rights.
IEC 61526 has been prepared by subcommittee 45B: Radiation protection instrumentation, of
IEC technical committee 45: Nuclear instrumentation. It is an International Standard.
This fourth edition cancels and replaces the third edition published in 2010. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) Modification of the title;
b) Inclusion of the measurement quantity for the dose in the lens of the eye, H (3);
p
c) Inclusion of measurement quantity for dose in the skin and extremities, H (0,07);
p
– 8 – IEC 61526:2024 © IEC 2024
d) Inclusion of dosemeters between active and passive: "hybrid dosemeters";
e) Inclusion of software requirements;
f) Harmonization of requirements for linearity to IEC 62387;
g) Revised neutron energy response requirements.
The text of this International Standard is based on the following documents:
Draft Report on voting
45B/1047/FDIS 45B/1049/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under webstore.iec.ch in the data related to the
specific document. At this date, the document will be
• reconfirmed,
• withdrawn, or
• revised.
IMPORTANT – The "colour inside" logo on the cover page of this document indicates
that it contains colours which are considered to be useful for the correct understanding
of its contents. Users should therefore print this document using a colour printer.

INTRODUCTION
This document applies to active, (direct reading or hybrid) personal dosemeters and monitors
used for measuring personal dose equivalents H (10), H (3), and H (0,07), for X, gamma,
p p p
neutron, and beta radiations.
For personal dose equivalent H (10) and for X and gamma radiation, two minimum rated ranges
p
for the photon energy are given. The first from 20 keV to 150 keV is for workplaces where low
energy X-rays are used, e.g., in diagnostic medicine, the second from 80 keV to 1,25 MeV is
for workplaces where high energy X-rays and/or gamma sources are used, e.g., in industry. For
neutron radiation the minimum rated range of neutron energy is from 0,025 eV (thermal
neutrons) to 10 MeV. The rated ranges can be extended to all energies covered by the
respective standards for reference radiation fields.
For personal dose equivalent H (3) and for X and gamma radiation, a minimum rated range for
p
photon energy from 30 keV to 250 keV is given. For personal dose equivalent H (0,07) a range
p
of 30 keV to 1250 keV or, for workplaces where low energy X-rays are used, 20 keV to 150 keV,
is given. For beta radiation for both quantities, the minimal rated range is from 0,24 MeV to
0,8 MeV (mean beta particle energy). The rated ranges can be extended to all energies covered
by the respective standards for reference radiation fields.
In some applications, for example, at a nuclear reactor installation where 6 MeV photon radi-
ation is present, measurement of personal dose equivalent (rate) H (10) for photon energies
p
up to 10 MeV should be required. In some other applications, measurement of H (10) down to
p
10 keV should be required.
For personal dosemeters, requirements for measuring the dose quantities H (10), H (3), and
p p
H (0,07), and for monitoring of the respective dose rate quantities are given. The measurement
p
of these dose rate quantities is an option for personal dosemeters.
Establishments in some countries may be permitted to use this type of personal dosemeter as
the dosemeter to provide the dose of record by an approved dosimetry service.

– 10 – IEC 61526:2024 © IEC 2024
RADIATION PROTECTION INSTRUMENTATION –
MEASUREMENT OF PERSONAL DOSE EQUIVALENTS FOR X,
GAMMA, NEUTRON AND BETA RADIATIONS –
ACTIVE PERSONAL DOSEMETERS
1 Scope
This document applies to personal dosemeters with the following characteristics:
a) They are worn on the trunk, close to the eye, or on the extremities.
b) They measure the personal dose equivalents H (10), H (3), and H (0,07), from external X
p p p
and gamma, neutron (not for H (3)), and beta radiations, and may measure the respective
p
personal dose equivalent rates for the same radiations (for alarming purposes).
c) They have a digital indication. This indication may or may not be attached.
d) They have alarm functions for the personal dose equivalents or personal dose equivalent
rates except for hybrid dosemeters. For hybrid dosemeters an alarm function for the
personal dose equivalents shall be implemented in the associated readout system.
NOTE 1 When reference is made in this document to "dose", this is meant to indicate personal dose equivalent,
unless otherwise stated.
NOTE 2 When reference is made in this document to "dosemeter", this is meant to include all personal dosemeters,
unless otherwise stated.
NOTE 3 This document does not cover neutron dosemeters for the H (3) measurements up to now.
p
This document specifies requirements for the dosemeter and, if supplied, for its associated
readout system.
Usually, a dosemeter is not able to measure all quantities given above. Thus, the dosemeter is
only tested with regard to those quantities and types of radiation it is intended to be used for.
Other types of radiation are considered as influence quantities which also may have
requirements.
This document specifies, for the dosemeters described above, general characteristics, general
test procedures, radiation characteristics as well as electrical, mechanical, safety and envi-
ronmental characteristics. The only requirements specified for associated readout systems are
those which affect its accuracy of readout of the personal dose equivalent and alarm settings,
and those which concern the influence of the reader on the dosemeter.
This document does not cover special requirements for accident or emergency dosimetry,
although the dosemeters may be used for this purpose.
This document does not apply to dosemeters used for measurement of pulsed radiation, such
as radiation emanating from many medical diagnostic X-ray facilities, linear accelerators or
similar equipment.
NOTE 4 Requirements and testing procedure for dosemeters used in pulsed field of ionizing radiation can be found
in IEC TS 63050 or IEC TS 62743.
This document does not apply for dosemeters to measure ambient or directional dose
equivalent.
NOTE 5 Requirements for ambient or directional dose equivalent meters can be found e.g. in: IEC 60846-1;
IEC 62387, IEC 61017 or IEC 60532.

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 document (including any
amendments) applies.
IEC 60050-395:2014, International Electrotechnical Vocabulary (IEV) – Part 395: Nuclear
instrumentation – Physical phenomena, basic concepts, instruments, systems, equipment and
detectors
IEC 60050-395:2014/AMD1:2016
IEC 60050-395:2014/AMD2:2020
IEC 60068-2-31:2008, Environmental testing – Part 2-31: Tests – Test Ec: Rough handling
shocks, primarily for equipment-type specimens
IEC 60086-1:2021, Primary batteries – Part 1: General
IEC 60086-2:2021, Primary batteries – Part 2: Physical and electrical specifications
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60529:1989/AMD1:1999
IEC 60529:1989/AMD2:2013
IEC 60904-3, Photovoltaic devices – Part 3: Measurement principles for terrestrial photovoltaic
(PV) solar devices with reference spectral irradiance data
IEC 61000-4-2, Electromagnetic compatibility (EMC) – Part 4-2: Testing and measurement
techniques – Electrostatic discharge immunity test
IEC 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement
techniques – Radiated, radio-frequency, electromagnetic field immunity test
IEC 61000-4-4, Electromagnetic compatibility (EMC) – Part 4-4: Testing and measurement
techniques – Electrical fast transient/burst immunity test
IEC 61000-4-5, Electromagnetic compatibility (EMC) – Part 4-5: Testing and measurement
techniques – Surge immunity test
IEC 61000-4-6, Electromagnetic compatibility (EMC) – Part 4-6: Testing and measurement
techniques – Immunity to conducted disturbances, induced
...