25 May 2005
Figure 7-9 Shaped Energy ISO Search X-Ray System Radiation Levels
(Courtesy of American Science and Engineering, Inc.)
7-188.8.131.52 Space Requirements for Fixed/Portable System
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 35 ft (10.7 m) wide x 110 ft (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, provide a longer inspection lane for operation of a
portable system that scans stationary vehicles, allowing 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 22 ft (6.7 m). This is