SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Laboratory technicians using a scanning electron microscope (SEM). This piece of equipment uses an electron beam to obtain a three-dimensional image of an object. The beam is scanned over the sample in a vacuum, causing the emission of secondary electrons. These secondary electrons are detected and used to form an image that is displayed on the screen. Photographed in Hanoi, Vietnam, in 1985.
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