IEC 62523:2010

IEC 62523 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Cargo/vehicle radiographic inspection
system
Instrumentation pour la radioprotection – Système radiographique d'inspection
de cargaison/véhicule
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IEC 62523 ®
Edition 1.0 2010-06
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Radiation protection instrumentation – Cargo/vehicle radiographic inspection
system
Instrumentation pour la radioprotection – Système radiographique d'inspection
de cargaison/véhicule
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
S
CODE PRIX
ICS 13.280 ISBN 978-2-88912-002-4
– 2 – 62523 © IEC:2010
CONTENTS
FOREWORD.4
1 Scope and object.6
2 Normative references .6
3 Terms and definitions .7
4 General characteristics of cargo/vehicle radiographic inspection system .9
4.1 General .9
4.2 Emergency stop devices.9
4.3 Software.9
4.4 Markings .9
4.5 Ambient dose equivalent rate isodose contour.9
4.6 Radioactive sources .10
4.7 Safety interlocks.10
4.8 Status indicators .10
4.9 Monitoring system .10
5 Inspection system classification.10
6 General test procedures .10
6.1 Nature of tests.10
6.2 Reference conditions and standard test conditions .10
6.3 Other conditions of the test .11
7 Imaging performance tests .11
7.1 Steel penetration .11
7.2 Wire detection .12
7.3 Contrast sensitivity.13
7.4 Spatial resolution .14
7.5 Material discrimination capability.15
8 Radiological safety tests.16
8.1 General .16
8.2 Ambient dose equivalent rate isodose contour.16
8.3 Ambient dose equivalent rate on the system boundary .17
8.4 Ambient dose equivalent rate at the operating positions .18
8.5 Ambient dose equivalent to the driver.18
8.6 Ambient dose equivalent to the object being inspected.19
9 Electrical safety tests .19
9.1 Equipment ground protection.19
9.2 Insulation resistance .19
9.3 Voltage test.19
9.4 Electric shock protection .20
10 Electromagnetic compatibility .20
10.1 Requirements.20
10.2 Test method .20
11 Environmental requirements .21
11.1 Requirements.21
11.2 Test method .21
12 Documentation .21
Bibliography.22

62523 © IEC:2010 – 3 –
Figure 1 – Steel penetration testing apparatus.12
Figure 2 – Wire detection testing apparatus .13
Figure 3 – Contrast indicator test apparatus.14
Figure 4 – Spatial resolution test apparatus .15
Figure 5 – A test sample for material discrimination capability test.16
Figure 6 – Layout of an example ambient dose equivalent rate isodose contour.17

Table 1 – Reference conditions and standard test conditions .11
Table 2 – Thicknesses for each material .15
Table 3 – Test voltage .20

– 4 – 62523 © IEC:2010
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
RADIATION PROTECTION INSTRUMENTATION –
CARGO/VEHICLE RADIOGRAPHIC INSPECTION SYSTEM

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
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Publications.
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) 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 62523 has been prepared by subcommittee 45B: Radiation
protection instrumentation, of IEC technical committee 45: Nuclear instrumentation.
The text of this standard is based on the following documents:
FDIS Report on voting
45B/638/FDIS 45B/652/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.

62523 © IEC:2010 – 5 –
The committee has decided that the contents of this amendment and the base publication
will remain unchanged until the stability date indicated on the IEC web site under
"http://webstore.iec.ch" in the data related to the specific publication. At this date, the
publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
– 6 – 62523 © IEC:2010
RADIATION PROTECTION INSTRUMENTATION –
CARGO/VEHICLE RADIOGRAPHIC INSPECTION SYSTEM

1 Scope and object
This International Standard applies to radiographic inspection systems with photon radiation
energy of at least 500 keV for inspection of cargo, vehicles and cargo containers.
Such inspection systems generally consist of radiation source(s), detectors, control system,
image processing system, radiation safety system and other auxiliary devices/facilities.
The object of this standard is to define the tests and the relevant testing methods for
determining the performance characteristics of the radiographic inspection systems.
This standard is not applicable to those cargo/vehicle inspection systems using neutron
source radiography, computed tomography or backscatter technology.
2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the cited edition applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60050-393:2003, International Electrotechnical Vocabulary (IEV) – Part 393: Nuclear
instrumentation – Physical phenomena and basic concepts
IEC 60050-394:2007, International Electrotechnical Vocabulary (IEV) – Part 394: Nuclear
instrumentation – Instruments, systems, equipment and detectors
IEC 60204-1:2005, Safety of machinery – Electrical equipment of machines – Part 1: General
requirements
IEC 61000-6-2:2005, Electromagnetic compatibility (EMC) – Part 6-2: Generic standards –
Immunity for industrial environments
IEC 61000-6-4, Electromagnetic compatibility (EMC) – Part 6-4: Generic standards –
Emission standard for industrial environments
IEC 61010-1:2001, Safety requirements for electrical equipment for measurement, control,
and laboratory use – Part 1: General requirements
ISO 4948-1, Steels – Classification – Part 1: Classification of steels into unalloyed and alloy
steels based on chemical composition
ISO 9978:1992, Radiation protection – Sealed radioactive sources – Leakage test methods
IAEA Safety Guide No.RS-G-1.10, Safety of Radiation Generator and Sealed Radioactive
Sources
IAEA Safety Guide No.TS-R-1, Regulations for the Safe Transport of Radioactive Material

62523 © IEC:2010 – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply, as well as those
given in IEC 60050-393 and IEC 60050-394.
3.1
transmission image
a projection image created by X-rays or gamma-rays passing through an inspected object,
based on the difference of their attenuation by the inspected object
3.2
cargo/vehicle radiographic inspection system (inspection system)
a system that makes use of X-ray or gamma-ray sources and radiation detectors to obtain
transmission images of cargo or vehicles
3.3
X-ray inspection system
an inspection system that uses accelerator(s) or generator(s) to produce bremsstrahlung
radiation as the source of X-ray for obtaining images
3.4
gamma-ray inspection system
an inspection system that uses radionuclide(s) as the source of gamma-ray for obtaining
images
3.5
controlled area
a controlled area is any area in which specific protection measures and safety provisions are
or could be required for:
a) controlling normal exposures or preventing the spread of contamination during normal
working conditions; and
b) preventing or limiting the extent of potential exposures
[IAEA No. 115]
3.6
supervised area
any area not designated as a controlled area but for which occupational exposure conditions
are kept under review even though specific protective measures and safety provisions are not
normally needed
[IAEA No. 115]
3.7
system boundary
the outer boundary of the supervised area
3.8
total absorber
any object through which the transmitted radiation is reduced to a level at which it is not
possible to distinguish from the background
3.9
steel penetration
the maximum thickness of steel (stated in mm), through which the X-rays or gamma-rays from
the inspection system can be measured and distinguished from the background

– 8 – 62523 © IEC:2010
3.10
wire detection
the minimum cross-section size of a wire, e.g., the diameter of a wire stated in mm, which can
be measured and distinguished from the background
3.11
contrast sensitivity
the ability to distinguish a small difference of measurements in an area from a surrounding
uniform background
3.12
spatial resolution
the ability to distinguish a pair of small object as separate entities
3.13
multiple energy system
an inspection system operating with two or more different spectra of radiation energy, and
being capable of distinguishing different materials
3.14
material discrimination capability
certain capability of an inspection system to discriminate different classes of materials
3.15
scanning speed
the speed of the inspected object moving relative to the inspection system, or vice versa
3.16
inspection dimension
the outer dimension of the largest object which could be scanned and inspected by an
inspection system
3.17
isodose contour
a perimeter around the inspection system on which all points receive equal amounts of
radiation dose from the operational radiation source
3.18
ambient dose equivalent rate
the ratio of dHx(10) by dt, where dHx(10) is the increment of ambient dose equivalent in the
time interval dt
dHx(10)
&
Hx(10) =
dt
–1
The SI unit of ambient dose equivalent rate is the sievert per second (Sv·s ). Units of
ambient dose equivalent rate are any quotient of the sievert or its decimal multiples or
–1
submultiples by a suitable unit of time (e.g., mSv·h ).
[IEC 60846-2009]
NOTE For a gamma-ray isotope, ambient dose equivalent rate assumes an instantaneous rate. For a pulsed x-
ray–generating device, ambient dose equivalent rate is given by the time-weighted average over a full pulse cycle.

62523 © IEC:2010 – 9 –
4 General characteristics of cargo/vehicle radiographic inspection system
4.1 General
The inspection systems are designed to create an image of the inspected object for an
operator to detect, locate, and identify contraband hidden in cargo and/or vehicles. Such a
system is generally composed of a radiation source(s), detectors, a mechanical and control
system, an image processing system, a radiation safety system to protect the operators and
the public against radiation, and other auxiliary devices/facilities.
The manufacturer shall state power requirements and the warm-up or set-up time of the
system.
4.2 Emergency stop devices
Inspection systems shall be equipped with emergency stop devices such as emergency
buttons, so that the radiation beam can be automatically shut off or the radioactive source can
be automatically retracted into its shielding assembly whenever any of these devices is
activated. Once any emergency stop device has been activated, the system shall not be able
to restart the radiation beam automatically. Manual operation, such as inserting a key on the
operator control panel and turning it to the “ON” position, is required to enable the restart of
the radiation beam.
Emergency stop devices shall be installed at several locations including, but not limited to the
operator control panel and in relatively close proximity to the radiation source and the
detectors.
The emergency stop devices shall work in a fail-safe mode. If an emergency stop device fails,
the radiation beam shall be shut off, and a failure status shall be indicated on the control
panel.
For a gamma-ray system, the radioactive source shutter shall be automatically closed or the
source shall be automatically retracted into its shielding assembly, in case of power failure.
4.3 Software
The system shall be able to process and display, save, backup and restore the digital
radiographic images of the inspected objects and other relevant inspection data, such as
container numbers, inspection date and cargo contents.
4.4 Markings
Markings shall be readable and permanently attached, including at least:
• manufacturer name;
• model number;
• unique serial number;
• function designation for control, switches, adjustments;
• radiation source and energy;
• ionizing radiation warning symbol;
• other safety warnings.
4.5 Ambient dose equivalent rate isodose contour
The manufacturer should provide an isodose contour of the ambient dose equivalent rate
around the source when the inspection system is operating.

– 10 – 62523 © IEC:2010
This isodose contour is provided for reference purposes only. It may change substantially
based upon the motion of the system and the object placed in the beam.
4.6 Radioactive sources
Radioactive sources shall be properly shielded and protected from unauthorized access. The
transportation and labelling of the radioactive sources shall comply with national and/or
international requirements (e.g., IAEA No.TS-R-1 and IAEA No.RS-G-1.10).
Provisions should be made for routine leak testing of the radioactive sources, in accordance
with ISO 9978:1992 in order to minimize the radiation exposure to the operator.
4.7 Safety interlocks
Safety interlocks shall be installed to prevent people from being accidentally exposed. The
radiation beam can only be turned on after all the safety interlocks are in the “ON” position. If
the status of any interlocks changes during operation, the radiation beam shall be terminated
or shuttered. The safety interlocks shall be designed to work in fail safe mode.
The safety interlocks shall provide an interface to link additional safety devices.
4.8 Status indicators
Status indicators shall be installed to provide audible and visual warning signals to warn
people of the danger of radiation exposure. These warning signals shall be started at least 5 s
before the beam is turned on and remain on during the scan until the radiation beam is turned
off. The configuration of status indicators shall comply with local regulations.
Ionizing radiation warning symbols or placards shall be placed along the boundary of the
controlled area and the supervised area.
4.9 Monitoring system
A video monitoring system shall be provided for the operator to observe the controlled area
and the supervised area.
5 Inspection system classification
The inspection system should be classified as:
• X-ray inspection system: an inspection system that uses an X-ray source for obtaining
images;
• Gamma-ray inspection system: an inspection system that uses a gamma-ray source for
obtaining images.
6 General test procedures
6.1 Nature of tests
Except where otherwise specified, the tests and test methods of Clauses 9, 10 and 11 in this
standard shall be considered as type tests. All the tests and test methods in this standard
may be considered acceptance tests based upon agreement between the user and the
manufacturer.
6.2 Reference conditions and standard test conditions
Except where otherwise specified, tests shall be carried out under the standard test
conditions shown in the third column of Table 1. For tests performed outside the standard test

62523 © IEC:2010 – 11 –
conditions, the values of temperature, pressure and relative humidity shall be stated and the
appropriate corrections, if any, made to give the response under reference conditions. All
tests in Clauses 7 and 8 shall be performed with the same values of these operating
parameters. The values of any corrections should be stated. Reference conditions are given
in the second column of Table 1.
The values in Table 1 are intended for tests performed in temperate climates. In other
climates, the actual values for the test shall be stated. Similarly atmospheric pressure lower
than 70 kPa may be permitted at higher altitudes.
Table 1 – Reference conditions and standard test conditions
Environment conditions Reference conditions Standard test conditions
Environment temperature 20 °C 15 °C to 35 °C
Relative humidity 65 % 50 % to 75 %
Atmospheric pressure 101,3 kPa 70 kPa to 106,6 kPa
Ambient dose equivalent rate Ambient dose equivalent rate less
Background radiation doserate
–1 –1
0,1 μSv·h than 0,25 μSv·h
Less than the lowest value that
Ambient electromagnetic field Negligible
causes interference
Less than twice the value of the
Ambient magnetic induction Negligible induction due to earth’s magnetic
field
6.3 Other conditions of the test
The plates, wires and sheets mentioned in Clause 7 of this standard should be fabricated with
C45 steel as defined in ISO 4948-1 or equivalent. The steel test pieces may be painted or
plated to eliminate dirty rust surfaces. All dimensions are specified prior to painting or plating.
Wires used in this standard are round wires.
The scanning speed, source intensity, source energy, source pulse rate for systems with a
linear accelerator source shall be stated for each test in Clauses 7 and 8.
7 Imaging performance tests
7.1 Steel penetration
7.1.1 Requirements
The manufacturer shall state the steel penetration expressed in millimeters as determined in
7.1.2.
7.1.2 Test method
a) The test apparatus is shown in Figure 1. The length of each side of the rectangular steel
plate shall not be less than 500 mm. The bottom of the plate shall be parallel to the ground.
b) The minimum length of each side of the section of the rectangular total absorber
perpendicular to the radiation beam shall not be less than 200 mm as shown in Figure 1.
c) The total absorber should be placed at the centre of the steel plate. The minimum distance
between the total absorber and the nearest edge of the steel plate should not be less than
50 mm.
d) The test apparatus should be placed perpendicular to the radiation beam at the centre of
the inspection dimension.
e) Scan the apparatus and inspect the image using image processing tools available on the
inspection system. Record the scanning speed and other particulars as stated in 6.3.

≥200 mm
– 12 – 62523 © IEC:2010
f) If the total absorber is discernible in the scanned image, then increase the thickness of the
steel plate and scan the apparatus again until the total absorber is not discernible in the
scanned image. The increment of the thickness shall be 10 mm.
g) The steel penetration is the sum of the thicknesses of the steel plates, behind which the
total absorber is discernible in the scanned image.
h) Additional measurements in other positions can be made based upon agreement between
the user and the manufacturer.
i) A statistical method with multiple tests for the determination of steel penetration may be
used based upon agreement between the user and the manufacturer.

IEC  1365/10
Figure 1 – Steel penetration testing apparatus
7.2 Wire detection
7.2.1 Requirements
The manufacturer shall state the wire detection expressed in millimeters as determined in
7.2.2.
7.2.2 Test method
a) One steel wire, or more such wires of different diameters shall be placed in air or behind a
steel plate with a thickness of 100 mm. The test apparatus with steel plate is shown in
Figure 2. The length of each side of the rectangular steel plate shall not be less than
500 mm. The bottom of the plate shall be parallel to the ground. Note that a low atomic
number material plate may be used to support the wire(s) when they are placed in air.
b) The distance between the ends of a steel wire and the nearest edge of the steel plate, if
any, shall not be less than 50 mm. The distance between any two wires shall not be less
than 50 mm. All the wires used shall be at least 100 mm long and oriented at 45º to the
sides of the plate.
c) The test apparatus should be placed perpendicular to the radiation beam at the centre of
the inspection dimension.
d) Scan the apparatus and inspect the image using image processing tools available on the
inspection system. Record the scanning speed and other particulars as stated in 6.3.
e) If all the steel wires are discernible in the scanned image, then decrease the diameters of
the steel wires and scan the apparatus again until at least one of the steel wires is not
discernible in the scanned image. The decrement of the diameter shall be 0,1 mm.
f) The wire detection is the diameter of the thinnest wire, which is discernible in the scanned
image.
≥200 mm
≥500 mm
62523 © IEC:2010 – 13 –
g) Additional measurements with other thicknesses of the steel plate may be made based
upon agreement between the user and the manufacturer.
h) Additional measurements at other positions may be made based upon agreement between
the user and the manufacturer.
i) Wires may also be shaped as circles or sinusoids based upon agreement between the
user and the manufacturer.
j) A statistical method with multiple tests for the determination of wire detection may be used
based upon agreement between the user and the manufacturer.
≥50 mm
Steel wire
45°
Steel plate
≥500 mm
IEC  1366/10
Figure 2 – Wire detection testing apparatus
7.3 Contrast sensitivity
7.3.1 Requirements
The manufacturer shall state the contrast sensitivity expressed in percentage as determined
in 7.3.2.
7.3.2 Test method
a) One rectangular steel sheet, or more such sheets of different thicknesses, shall be placed
behind a steel plate with a thickness of 100 mm. The test apparatus with steel plate is
shown in Figure 3. The length of each side of the rectangular steel plate shall be at least
500 mm. The bottom of the plate shall be parallel to the ground.
b) The length of the each side of the sheet(s) shall not be less than 100 mm and oriented at
45º to the side of the plate as shown in Figure 3.
c) The minimum distance between a steel sheet and the nearest edge of the steel plate shall
not be less than 50 mm. The minimum distance between any two steel sheets shall not be
less than 50 mm.
d) The test apparatus should be placed perpendicular to the radiation beam at the centre of
the inspection dimension.
e) Scan the apparatus and inspect the image using image processing tools available on the
inspection system. Record the scanning speed and other particulars as stated in 6.3.
f) If all the steel sheets are discernible in the scanned image, then decrease the thickness of
the steel sheet and scan the apparatus again until at least one of the steel sheets is not
discernible in the scanned image. The decrement of the thickness shall be 0,1 mm.
g) The contrast sensitivity is the ratio (expressed as a percentage) of the thickness of the
thinnest steel sheet, which is discernible behind the steel plate of a specified thickness, to
the thickness of the steel plate.
h) Additional measurements with steel plate of other thicknesses may be made based upon
agreement between the user and the manufacturer.
≥1 m
00 m
≥500 mm
– 14 – 62523 © IEC:2010
i) Additional measurements at other positions may be made based upon agreement between
the user and the manufacturer
j) A statistical method with multiple tests for the determination of contrast sensitivity may be
used based upon agreement between the user and the manufacturer.
IEC  1367/10
Figure 3 – Contrast indicator test apparatus
7.4 Spatial resolution
7.4.1 Requirements
The manufacturer shall state the spatial resolution expressed in millimeters as determined in
7.4.2.
7.4.2 Test method
a) Three sets of test wires should be used in this test and for each of the three sets, two or
more steel wires of diameter 'x' mm spaced at '2x' mm (i.e., a space of 'x mm between
edges of the wires) should be placed in air. The test apparatus is shown in Figure 4. Note
that a low atomic number material plate may be used to support wires and the bottom of
the plate shall be parallel to the ground.
b) All the wires used shall be at least 100 mm long. The three sets of the test wires shall be
oriented respectively parallel, perpendicular and at 45º to the bottom of the plate.
c) The test apparatus shall be placed perpendicular to the radiation beam at the centre of the
inspection dimension.
d) Scan the apparatus and inspect the image using image processing tools available on the
inspection system. Record the scanning speed and other particulars as stated in 6.3.
e) If all the steel wires are distinguished as separated entities in the image, then decrease
the diameter and scan the apparatus again until the steel wires cannot be distinguished in
the image. The decrement of the diameter shall be 0,1 mm.
f) If there are two or more wires of diameter 'x' mm spaced at '2x' mm (i.e., a space of 'x mm
between edges of the wires), then the smallest value of 'x' mm that results in the number
of tested wires being distinguishable in the image defines the spatial resolution of the
inspection system under test.
g) Additional measurements with steel plate used as blocking material can be made based
upon agreement between the user and the manufacturer. The thickness of the steel plate
shall be stated.
h) Additional measurements at other positions can be made based upon agreement between
the user and the manufacturer.
i) Additional measurements in other orientations of the wires can be made based upon
agreement between the user and the manufacturer.
≥100 mm
≥500 mm
62523 © IEC:2010 – 15 –
j) A statistical method with multiple tests for the determination of spatial resolution may be
used based upon agreement between the user and the manufacturer.

IEC  1368/10
Figure 4 – Spatial resolution test apparatus
7.5 Material discrimination capability
7.5.1 Requirements
The manufacturer shall state the material discrimination capability of a multiple energy system,
if the system has such a capability.
7.5.2 Test method
a) The test apparatus shall consist of 4 testing samples made of lead, steel, aluminium, and
graphite respectively.
b) The dimensions of the samples are shown in Figure 5, in which the stepped samples of
different thicknesses are used to cover the whole range of inspection. The specified
stepped thicknesses for each material are shown in Table 2.
Table 2 – Thicknesses for each material
Thickness
mm
T1 T2 T3 T4 T5
Material
lead 10 20 40 60 100
steel 15 30 60 90 150
aluminium 40 80 160 250 400
graphite 100 200 400 600 N/A
c) Each edge of every rectangular surface of all stepped samples shall not be less than
200 mm.
d) A testing sample should be placed perpendicular to the radiation beam (refer to Figure 5)
at the centre of the inspection dimension. The length of the test samples are oriented
parallel to the ground.
e) Scan the apparatus and inspect the image using image processing tools available on the
inspection system. Record the scanning speed and other particulars as stated in 6.3.
f) Different materials should be displayed in different hues in the scanned image of the
inspection system. A material with different thickness should be displayed in the same hue.
Additional software may be used for analysis of the image colour.
g) A system that can distinguish one material from another material (Table 2) shall be able to
display the same material with at least two different thicknesses as the same hue. A
system that can discriminate different materials shall be able to distinguish at least two
materials from any other materials in Table 2.
h) Additional measurements with blocking material can be made based upon agreement
between the user and the manufacturer.
≥100 mm
≥100 mm
– 16 – 62523 © IEC:2010
i) A statistical method with multiple tests for the determination of material discrimination
capability may be used based upon agreement between the user and the manufacturer.

IEC  1369/10
Figure 5 – A test sample for material discrimination capability test
8 Radiological safety tests
8.1 General
The radiological safety test shall be performed when the radiation source in the inspection
system works at its highest operational radiation level, and the other test conditions shall be
the same as for the specified imaging performance test in Clause 7.
The scattered radiation from the scanned object will often increase the ambient dose
equivalent rate around the inspection system. So a container, vehicle, or pallet, whichever is
most appropriate for the inspection system, is recommended as the reference scanned object
for the radiological safety test. A different reference scanned object can be used based upon
agreement between the user and the manufacturer.
The manufacturer shall use the ambient dose equivalent (rate) measurement instrument
appropriate for the radiation source(s) used in the system and shall provide the instrument
type, manufacturer and serial number, and calibration certification.
8.2 Ambient dose equivalent rate isodose contour
8.2.1 Requirements
–1
The ambient dose equivalent rate isodose contour of 2,5 μSv·h around the system shall be
measured and provided.
This set of measurements is required for any system that uses distance and/or a supervised
area as part of the radiation control of the system. Where the ambient dose equivalent rate at
–1
5 cm outside all reachable surfaces of the system is less than 2,5 μSv·h above natural
background, this test is not required.
≥200 mm
62523 © IEC:2010 – 17 –
8.2.2 Test method
a) The system shall be tested in a static mode to make measurements more accurate and
repeatable.
b) Measure and record the ambient dose equivalent rate in the primary forward direction at
1 m away from the radiation source as its radiation output level.
c) Place the referenced scanned object in the scanned position.
d) Move the radiation measurement instrument in and out along each angle direction
specified in Figure 6 to find the position where the ambient dose equivalent rate is
–1
2,5 μSv·h above natural background. The instrument shall be at 1 m ± 0,1 m above the
ground level, and the angle directions from 0° to 360°. Measurements should be taken at
appropriate angle intervals as indicated in Figure 6.
e) Draw the lines to connect the positions in sequence to plot the ambient dose equivalent
–1
rate isodose contour of 2,5 μSv·h for the system.
f) Additional measurements at different angles or heights can be made based upon
agreement between the user and the manufacturer.

Angle interval of 15°
90°
105° 75°
Position of specified 60°
120°
ambient dose
equivalent rate 45°
135°
Angle interval of 5°
30°
150°
15°
165°
Angle interval of 1°
5°
0°
180°
Radiation beam direction
195° 345°
Radiation source
210°
330°
315°
225°
240° 300°
255°
285°
270°
IEC  1370/10
Figure 6 – Layout of an example ambient dose equivalent rate isodose contour
8.3 Ambient dose equivalent rate on the system boundary
8.3.1 Requirements
Along the system boundary stated by the manufacturer, the maximum value of the ambient
–1
dose equivalent rate shall not be higher than 2,5 μSv·h , above natural background during
the scan, however, different national regulatory limits may apply.
8.3.2 Test method
a) Measure and record the ambient dose equivalent rate in the primary forward direction at
1 m away from the radiation source as its radiation output level.
b) Place the referenced scanned object in the scanned position.

– 18 – 62523 © IEC:2010
c) Measure and record the ambient dose equivalent rate at 1 m ± 0,1 m above the ground
level along the system boundary stated by the manufacturer.
d) If the radiation source in the inspection system moves during the scan, the ambien
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