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How does an X-ray work?

An X-ray machine is essentially a camera. Instead of visible light, however, it uses X-rays to expose structures inside the body. The part of your body that requires examination is positioned between the X-ray machine and photographic film. Bones, tumors and other dense matter appear white or light because they absorb the radiation. Breaks in bones let radiation pass through, making these parts look darker on the X-ray film.