JERRY MASON / SCIENCE PHOTO LIBRARY JERRY MASON / SCIENCE PHOTO LIBRARY
Bag X-ray. Coloured X-ray showing the contents of a suitcase as revealed by a surveillance X-ray machine. Airport X-ray machines scan luggage for weapons such as guns and explosives. Any metal objects inside an item of luggage block the X- rays, leaving dark shadows which appear on a screen watched by security personnel.
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