RUSSELL D. CURTIS / SCIENCE PHOTO LIBRARY RUSSELL D. CURTIS / SCIENCE PHOTO LIBRARY
X-ray. A patient having an X-ray to examine bone composition. X-rays are used to produce images of bones, organs and internal tissues. Low doses of X-rays are passed through the tissues and cast images onto a film or a fluorescent screen. Each of the body's tissues absorb X-rays in a different way. Bones, which are dense and contain calcium, absorb X-rays well and therefore appear to be white on a film; soft tissues absorb X-rays to a lesser extent and are shown dark grey on a film.
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