The system and method described herein facilitate back-to-back automatic scanning
of moving vehicles without have the vehicles stop in the scanning zone. The system
includes a scanning zone that comprises a radiation source and a radiation source
detector. The system further includes a first sensor component for automatically
sensing when a first portion of the moving target has passed through the scanning
zone and a second portion of the moving target is about to enter the scanning zone,
wherein the first sensor component sends a signal to the automated target inspection
system to initiate a scan of the second portion upon sensing that the second portion
of the target is about to enter the scanning zone. Additionally, a shutter, triggered
by a signal from the first sensor component, allows radiation from the radiation
source to pass through the scanning zone in the direction of the radiation detector
when the second portion of the moving target is passing through the scanning zone
and closes off the radiation when the second portion of the moving target is no
longer within the scanning zone.