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X-Ray Baggage Scanners
(Chapter 3   Metal Detection, Continued)

Throughput

Exhibit 3.12The expected throughput of an x-ray baggage scanner will depend on two things: the efficiency of the operator and the amount of clutter in a typical bag at this particular school. Clutter can also affect the speed of the operator. Carried purses and bookbags that contain many high Z-material items, such as metal rulers, screwdrivers or other tools, metal aspirin tins, foil-wrapped items, and so forth, can significantly slow down an operator who is examining each piece of baggage. Fortunately (or unfortunately), in most schools where the security equipment operators become familiar with the individual students and the kinds of things they usually carry, the speed of an operator will increase.

Generally, between 10 and 20 items per minute can be examined using an x-ray baggage scanner. As many as 30 items per minute can be effectively scanned if most of the items are benign, i.e., contain no obvious metal items larger than a coin or button, none of which are touching in the image. Dense clutter within a bag will necessitate that bag being pulled off the conveyor to be manually searched.

 



Research Report:   The Appropriate and Effective Use of Security Technologies in U.S. Schools