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barium |
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bariumSoft, silver-white, metallic element, atomic number 56, relative atomic mass 137.33. It is one of the alkaline-earth metals, found in nature as barium carbonate and barium sulphate. As the sulphate it is used in medicine: taken as a suspension (a ‘barium meal’), its movement along the gut is followed using X-rays. The barium sulphate, which is opaque to X-rays, shows the shape of the gut, revealing any abnormalities of the alimentary canal. Barium is also used in alloys, pigments, and safety matches and, with strontium, forms the emissive surface in cathode-ray tubes. It was first discovered in baryte or heavy spar. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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In 1991, a latex barium enema tip associated with 16 deaths was recalled by the Food and Drug Administration (FDA); this led to an increased awareness of the risk of life-threatening type I allergy associated with NRL devices (Gelfand 1991). A member was considered to have had a colorectal cancer screening if the claims analysis found evidence of a fecal occult blood test (FOBT), sigmoidoscopy, colonoscopy, or double-contrast barium enema. had originally had an incomplete colonoscopy and never had a follow-up barium enema to exclude cancer. |
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