ANTONIA REEVE / SCIENCE PHOTO LIBRARY ANTONIA REEVE / SCIENCE PHOTO LIBRARY
X-ray examination. X-rays emitted from an overhead machine (upper left) pass through the patient and cast an image of her internal structure onto film positioned beneath her. The resulting image is used to diagnose internal injuries or disorders. Because X-rays are potentially harmful to dividing cells, the rest of the patient's body is protected from the X-ray source. The radiographer operates the machinery from a shielded area of the room. X-rays are electromagnetic waves of a short wavelength that penetrate soft tissues and are absorbed by bones.
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