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 If an inspection system is specified, consult with the manufacturer concerning the latest
requirements for power. If no inspection is specified, however, the future inclusion of a system
is likely, the design of the electrical power system should consider an allowance to provide
sufficient site power to support this future requirement.
The space requirements of these systems also vary greatly. Systems that require a stationary
vehicle or move the vehicle on a rail or platen system passed fixed detectors require the most
space. A portal system requires minimal space. If an entry control facility or truck inspection
station design is to incorporate a fixed vehicle inspection system similar to those illustrated
above, but if the system is unspecified the following recommendations regarding site
development should be followed.
Provide a 10.7 m wide x 33.5 m long paved inspection area for use by the fixed
equipment. This provides enough width for the inspection system and the length of
travel for the equipment or a platen/gantry system. The length is sufficient to allow
the inspection system to scan a large stationary vehicle and maneuver.
To increase throughput a longer inspection lane can be provided for operation of a
portable system that scans stationary vehicles. This will allow the system to scan
several vehicles at one time.
Provide no canopy over the inspection lanes dedicated for use by the fixed equipment
unless the clear height is a minimum of 6.7 m. This is conservative since some systems
will operate with a clear height of 4.57 meters (15 ft.) and could be installed under a
canopy.
Consider provisions for automated inspection equipment to be installed prior to the
main inspection area. It is often desirable to complete any automated inspection such
as UVSS or imaging prior to arriving at the main, covered inspection area for
identification and further inspection tasks. Therefore these functions should precede
the final inspection area. Most inspection systems are designed to be outside and do
not require shelter from the weather.
Site all permanent facilities or guard posts such that they would remain outside of the
exclusion zone. A shielding wall may be required if there are occupied buildings or
areas near the detector.
Site all permanent facilities such that they are not in the direction of travel of the
transmission beam unless the distance between the inspection vehicle and the facility is
at least 90m. The intent is to insure that the 100 mR / year radiation dose limit is not
exceeded for personnel who may be in the direction of travel of the radiation. This
distance can be reduced to 23 m if a 305 mm wide x 2.4 m high (minimum) concrete
shielding wall is provided between the radiation source and any facility of concern.
Provide channelization islands with a minimum width of 1.5 meters (5 ft.) to support the
future installation of a portal inspection system.
In Section 7.3, layout design recommendations intended to provide flexibility for the future
inclusion of these systems are developed.
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