Radiation protection instrumentation - Dosemeters for pulsed fields of ionizing radiation

IEC TS 63050:2019 applies to all types of dosemeters, irrespective of the type of radiation intended to be measured. Tests according to this document determine whether a single radiation pulse can be measured correctly even if the dosemeter is in the internal state relevant for measuring background or environmental radiation.
The annex in the document gives some parameter values for typical workplaces where pulsed radiation occurs.
This document considers the pulsation of the radiation field as an additional influence quantity like particle energy and direction of radiation incidence. Therefore, the tests described are additional to all the tests in the instrument specific standards. This document describes methods to determine the following characteristic parameters of the dosemeters:
the maximum measurable dose rate in the pulse, Hmeas,max
the maximum measurable dose in the pulse, Hmeas,max
the minimal pulse duration, tmeas,min and
the range for the pulse repetition frequency, fmeas,min  to fmeas,max

General Information

Status
Published
Publication Date
21-Oct-2019
Current Stage
PPUB - Publication issued
Completion Date
22-Oct-2019
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IEC TS 63050
Edition 1.0 2019-10
TECHNICAL
SPECIFICATION
colour
inside
Radiation protection instrumentation – Dosemeters for pulsed fields of ionizing
radiation
IEC TS 63050:2019-10(en)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC TS 63050
Edition 1.0 2019-10
TECHNICAL
SPECIFICATION
colour
inside
Radiation protection instrumentation – Dosemeters for pulsed fields of ionizing
radiation
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
ICS 13.280 ISBN 978-2-8322-7421-7

Warning! Make sure that you obtained this publication from an authorized distributor.

® Registered trademark of the International Electrotechnical Commission
---------------------- Page: 3 ----------------------
– 2 – IEC TS 63050:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

INTRODUCTION ..................................................................................................................... 6

1 Scope .............................................................................................................................. 8

2 Normative references ...................................................................................................... 9

3 Terms and definitions, abbreviated terms and symbols, quantities and units .................... 9

3.1 Terms and definitions .............................................................................................. 9

3.2 Abbreviated terms and symbols ............................................................................ 11

3.3 Quantities and units .............................................................................................. 12

4 General test procedure .................................................................................................. 12

4.1 Nature of test ........................................................................................................ 12

4.2 Reference conditions and standard test conditions ................................................ 12

5 General requirements .................................................................................................... 13

5.1 Summary of requirements ..................................................................................... 13

5.2 Parameters required to be known of the pulsed radiation field .............................. 13

5.3 Parameters required to be determined of the dosemeter ....................................... 13

5.4 Criteria for suitability of a dosemeter in pulsed radiation fields .............................. 13

5.4.1 General ......................................................................................................... 13

5.4.2 Requirements ................................................................................................ 14

5.4.3 Method of test and interpretation of the results .............................................. 14

5.5 Mechanical characteristics .................................................................................... 14

5.6 Requirements for the documentation ..................................................................... 14

6 Radiation detection requirements .................................................................................. 14

6.1 General ................................................................................................................. 14

6.2 Maximum measurable dose rate value, H ................................................ 14

meas, max

6.2.1 Requirements ................................................................................................ 14

6.2.2 Method of test................................................................................................ 15

6.2.3 Interpretation of the results ............................................................................ 16

6.3 Pulse dose rate overload alarm ............................................................................. 17

6.3.1 General ......................................................................................................... 17

6.3.2 Requirements ................................................................................................ 17

6.3.3 Method of test................................................................................................ 17

6.3.4 Interpretation of the results ............................................................................ 17

6.4 Overload and pulse dose rate overload alarm ....................................................... 17

6.4.1 Requirements ................................................................................................ 17

6.4.2 Method of test................................................................................................ 17

6.4.3 Interpretation of the results ............................................................................ 18

7 Environmental requirements .......................................................................................... 18

8 Mechanical requirements ............................................................................................... 18

9 Electromagnetic requirements ....................................................................................... 18

10 Documentation .............................................................................................................. 19

10.1 Operation and maintenance manual ...................................................................... 19

10.2 Type test report .................................................................................................... 19

Annex A (informative) Parameter values for typical workplaces where pulsed radiation

occurs ................................................................................................................................... 21

Annex B (informative) Typical examples of test results for 6.2.2.1 and 6.2.2.2 ..................... 22

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IEC TS 63050:2019 © IEC 2019 – 3 –

Bibliography .......................................................................................................................... 23

Figure B.1 – Typical test results for an electronic personal dosemeter using radiation

pulses with constant dose rate and various pulse durations, i.e. varying dose

equivalents per radiation pulse ............................................................................................. 22

Figure B.2 – Typical test results for three personal dosemeters using radiation pulses

with constant dose of 1 mSv and various pulse durations, i.e. various pulse dose

equivalent rates .................................................................................................................... 22

Table 1 – Abbreviated terms and symbols ............................................................................. 12

Table 2 – Reference conditions and standard test conditions for tests using pulsed

radiation ............................................................................................................................... 19

Table 3 – Characteristics of dosemeters used in pulsed fields of ionizing radiation ............... 20

Table A.1 – Parameter values for workplaces where pulsed radiation occurs ........................ 21

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– 4 – IEC TS 63050:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION – DOSEMETERS
FOR PULSED FIELDS OF IONIZING RADIATION
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

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The main task of IEC technical committees is to prepare International Standards. In

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Technical Specifications are subject to review within three years of publication to decide

whether they can be transformed into International Standards.

IEC 63050, which is a technical specification, has been prepared by subcommittee 45B:

Radiation protection instrumentation, of IEC technical committee 45: Nuclear instrumentation.

---------------------- Page: 6 ----------------------
IEC TS 63050:2019 © IEC 2019 – 5 –
The text of this Technical Specification is based on the following documents:
Draft TS Report on voting
45B/903/DTS 45B/925A/RVDTS

Full information on the voting for the approval of this Technical Specification can be found in

the report on voting indicated in the above table.

This document has been drafted in accordance with the ISO/IEC Directives, Part 2.

The committee has decided that the contents of this document will remain unchanged until the

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colour printer.
---------------------- Page: 7 ----------------------
– 6 – IEC TS 63050:2019 © IEC 2019
INTRODUCTION

The specification and determination of the special characteristics required for dosemeters to

be used in pulsed fields of ionizing radiation have been excluded from all standards for direct

reading personal and environmental dosemeters issued before 2015 for radiation protection

purposes. These standards only specify characteristics for continuous radiation. This Techni-

cal Specification provides the necessary information for the measurement of one single radia-

tion pulse, which is the most difficult situation to be measured. The characteristics of a dose-

meter for repeated pulses is expected to be better than for one single radiation pulse with the

same parameters but worse than for continuous radiation, i.e., in between of the characteris-

tics for these two extreme conditions.

The concept is similar to the concept used for other influence quantities, e.g., radiation

energy. The workplace is characterized by the parameter range occurring at that workplace,

i.e., in the case of energy the expected possible values of radiation energy. It can then be

determined if the dosemeter under consideration can be used. The required parameters for a

workplace where pulsed radiation occurs are:

– the maximum dose rate during the radiation pulse, H , occurring at the workplace,

pulse,max
– the maximum dose per radiation pulse, H , occurring at the workplace,
pulse,max
– the minimum radiation pulse duration, t , occurring at the workplace, and
pulse,min
– the range of the pulse repetition frequency, f , occurring at the workplace.
pulse

The instrument parameters to be determined during type test of the dosemeter are:

– the maximum measurable dose rate in the pulse, H ,
meas,max
– the maximum measurable dose in the pulse, H ,
meas,max
– the minimal pulse duration, t , and
meas,min
– the range for the pulse repetition frequency, f to f .
meas,min meas,max
NOTE These parameters may be inter-related depending on the detector used.

In principle, the parameters resulting from the type test could be determined using continuous

radiation fields if the detector is connected to simple, linear and straight forward electronics.

But nearly any dosemeter exhibits one or more of the following properties. It:
– has a finite dead time,
– uses internal range switching,

– uses software to correct for known deficiencies, e.g., the dead time or the radiation

energy,
– uses special, proprietary algorithms,
– adjusts the measurement cycle time, T , to the dose rate, G , measured by the
cycle dose
dosemeter,
– mitigates the effect of EMC-pulses and mechanical drops.

All these properties could affect the results when determining the characteristics for pulsed

radiation fields by using continuous radiation fields. The conclusion is that measurements

using pulsed radiation fields are required for testing of dosemeters.

As a help to the user to judge whether or not the dosemeter under consideration can be used,

Table A.1 in the informative Annex A gives some parameter values for typical workplaces

where pulsed radiation occurs. They are based on the knowledge available in 2019 and may

change with the next generation of pulsed radiation generating equipment.
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IEC TS 63050:2019 © IEC 2019 – 7 –

This Technical Specification is a generalized version of IEC TS 62743 and not limited to

dosemeters using pulse counting techniques. This Technical Specification might replace IEC

TS 62743 in the future. This Technical Specification contains much information for which

worldwide experience is not available at the date of its development. Therefore, it was

decided to publish it as a Technical Specification. It is expected that within the next years this

experience will be gained and then maintenance of this publication could lead to an

International Standard.
---------------------- Page: 9 ----------------------
– 8 – IEC TS 63050:2019 © IEC 2019
RADIATION PROTECTION INSTRUMENTATION – DOSEMETERS
FOR PULSED FIELDS OF IONIZING RADIATION
1 Scope

This document applies to all types of dosemeters, irrespective of the type of radiation

intended to be measured. Tests according to this document determine whether a single

radiation pulse can be measured correctly even if the dosemeter is in the internal state

relevant for measuring background or environmental radiation. The characteristics of the

dosemeter for repeated pulses is expected to be better than for one single radiation pulse

with the same parameters but worse than for continuous radiation, i.e., in between of the

characteristics for these two extreme conditions.
The pulsed radiation source is characterized by the parameters:

– the maximum dose rate during the radiation pulse, H , occurring at the workplace,

pulse,max
– the maximum dose per radiation pulse, H , occurring at the workplace,
pulse,max
– the minimum radiation pulse duration, t , occurring at the workplace, and
pulse,min
– the range of the pulse repetition frequency, f , occurring at the workplace.
pulse

Annex A gives some parameter values for typical workplaces where pulsed radiation occurs.

This document considers the pulsation of the radiation field as an additional influence quantity

like particle energy and direction of radiation incidence. Therefore, the tests described are

additional to all the tests in the instrument specific standards.

This document describes methods to determine the following characteristic parameters of the

dosemeters:
– the maximum measurable dose rate in the pulse, H ,
meas,max
– the maximum measurable dose in the pulse, H ,
meas,max
– the minimal pulse duration, t , and
meas,min
– the range for the pulse repetition frequency, f to f .
meas,min meas,max
NOTE These parameters may be inter-related depending on the detector used.

It is applicable to photon radiation but basically can be adapted to all types of radiation for

which a suitable pulsed reference field is available. The term dose is used in this document in

the sense of dose equivalent, but the requirements can also be adapted to air kerma,

exposure or other quantities expressing the amount of radiation.

The parameter pulse repetition frequency, f , is included in the testing procedures, but for

pulse

this inclusion additional work has to be done. Especially, reference fields for radiation

conditions in surrounding fields of accelerators are missing (high pulse repetition frequency,

ultra-short pulses).
---------------------- Page: 10 ----------------------
IEC TS 63050:2019 © IEC 2019 – 9 –
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, International Electrotechnical Vocabulary (IEV) – Part 395: Nuclear

instrumentation – Physical phenomena, basic concepts, instruments, systems, equipment and

detectors

IEC 61267:2005, Medical diagnostic X-ray equipment – Radiation conditions for use in the

determination of characteristics

ISO 4037-3:2019, Radiological protection – X and gamma reference radiation for calibrating

dosemeters and doserate meters and for determining their response as a function of photon

energy – Part 3: Calibration of area and personal dosemeters and the measurement of their

response as a function of energy and angle of incidence

ISO TS 18090-1:2015, Radiological protection – Characteristics of reference pulsed

radiation – Part 1: Photon radiation
3 Terms and definitions, abbreviated terms and symbols, quantities and units
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-395,

ISO TS 18090-1 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following

addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1.1
continuous radiation

ionizing radiation with a constant dose rate at a given point in

space for time intervals longer than 10 s
[SOURCE: ISO TS 18090-1:2015, 3.2]
3.1.2
dose equivalent per radiation pulse
pulse
dose equivalent value of one radiation pulse at a point in the radiation field

[SOURCE: ISO TS 18090-1:2015, 3.3 modified: The term “photon radiation field” has been

replaced by “radiation field”.]
3.1.3
dose indication
dose
indication of the dosemeter in terms of dose
---------------------- Page: 11 ----------------------
– 10 – IEC TS 63050:2019 © IEC 2019
3.1.4
dose rate indication
dose
indication of the dosemeter in terms of dose rate
3.1.5
internal state
soft and hardware parameters set internally (by the dosemeter)

EXAMPLE: When the dosemeter is for a long time span not exposed to any artificial radiation then the sensitivity

and the cycle time are set to the maximum values to indicate the dose value with the highest resolution possible

and to reduce the coefficient of variation of the indication.
3.1.6
maximum measurable dose in the radiation pulse
meas, max

maximum value of one radiation pulse dose which can be measured by the dosemeter without

exceeding stated maximum errors
3.1.7
maximum measurable dose rate in the radiation pulse
meas, max

maximum value of one radiation pulse dose rate which can be measured by the dosemeter

without exceeding stated maximum errors
3.1.8
maximum radiation pulse dose
pulse,max
maximum dose of one radiation pulse occurring at a point in the radiation field
3.1.9
maximum radiation pulse dose rate
pulse, max
maximum radiation pulse dose rate occurring at a point in the radiation field
3.1.10
measurement cycle time
cycle

time interval required by the counting dosemeter for one sequence of the repeated operations

to determine the actual value of the indication
3.1.11
pulsed radiation

ionizing radiation which never has a constant dose rate at a

given point in space for time intervals longer than 10 s
[SOURCE: ISO TS 18090-1:2015, 3.9]
3.1.12
radiation pulse

abrupt variation of short duration of the radiation dose rate from zero followed by a rapid

return to zero

[SOURCE: IEC 60050-702:1992, 702-03-01, modified: The term “pulse” has been replaced

by “radiation pulse” and the words “a physical quantity” and “the initial value” have been

replaced by “the radiation dose rate from zero” and “zero”.]
---------------------- Page: 12 ----------------------
IEC TS 63050:2019 © IEC 2019 – 11 –
3.1.13
radiation pulse duration
radiation pulse width
pulse

interval of time between the first and last instants at which the instantaneous air kerma rate

value of the equivalent trapezoidal pulse reaches 50 % of its maximum value
[SOURCE: ISO TS 18090-1:2015, 3.11]
3.1.14
radiation pulse dose equivalent rate
pulse dose equivalent rate
pulse

quotient of the dose equivalent per radiation pulse and the radiation pulse duration at a point

in the radiation field

Note 1 to entry: The dose equivalent per radiation pulse can be measured either by an integral measurement with

an ionisation chamber or time resolved by a suitable instrument, both calibrated in terms of the relevant quantity.

[SOURCE: ISO TS 18090-1:2015, 3.14 modified: The symbol H has been changed
a,pulse
to H .]
pulse
3.1.15
pulse repetition frequency
pulse
number of pulses in a periodic pulse train divided by the duration of the train
[SOURCE: IEC 60050-702:1992, 702-03-07]
3.1.16
pulse train
discrete sequence of a finite number of pulses
Note 1 to entry: The sequence can be periodic or non-periodic.
[SOURCE: ISO TS 18090-1, 3.8]
3.2 Abbreviated terms and symbols
Table 1 gives a list of the symbols and abbreviated terms used.
---------------------- Page: 13 ----------------------
– 12 – IEC TS 63050:2019 © IEC 2019
Table 1 – Abbreviated terms and symbols
Symbol Meaning Unit
G Dose indication of the dosemeter Sv
dose
G Dose indication of the dosemeter for the pulse condition no. i Sv
dose, i
Dose rate indication of the dosemeter
Sv h
dose
H Lower limit of the measuring range of the dosemeter Sv
H Dose per radiation pulse Sv
pulse
H Dose of one radiation pulse for the pulse condition no. i Sv
pulse, i

H Maximum dose of one radiation pulse occurring at a point in the radiation field Sv

pulse, max
Maximum measurable dose in the pulse
meas, max
Maximum measurable dose rate in the pulse
H Sv h
meas, max

Maximum dose rate of the radiation pulse occurring at a point in the radiation field

H Sv h
pulse, max
Pulse dose rate
H Sv h
pulse
Pulse dose rate for the pulse condition no. i
H Sv h
pulse, i
f Pulse repetition frequency s
pulse

f Minimal / maximal pulse repetition frequency at which the dosemeter can measure s

meas,min
meas,max
t Radiation pulse duration s
pulse
t Minimal radiation pulse duration s
pulse,min
t Minimal radiation pulse duration at which the dosemeter can measure s
meas,min
3.3 Quantities and units

In the present document, units of the International System (SI) are used. The definitions of

radiation quantities are given in IEC 60050-395.

Multiples and submultiples of SI units are used, when practicable, according to the SI system.

4 General test procedure
4.1 Nature of test

All tests are considered as type tests. They treat the pulsation of the radiation field as an

additional influence parameter like particle energy and direction of radiation incidence. These

tests are additional to all the tests in the instrument specific standards.
4.2 Reference conditions and standard test conditions

The general reference conditions and standard test conditions are the same as stated in the

instrument specific standard for the type of dosemeter under test. The special reference

conditions for tests concerning pulsed radiation are given in Table 2.
---------------------- Page: 14 --------
...

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