Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A silvery-gray radioactive metal, the first synthetically produced element, having isotopes with masses ranging from 85 to 118 and half-lives up to 4.2 million years. It is principally used as a tracer in a variety of medical applications. It is a remarkable inhibitor of corrosion in steel, but this use is limited because of radioactivity hazards. Atomic number 43; melting point 2,157°C; boiling point 4,265°C; specific gravity 11.50 (calculated); valence 0, 2, 4, 5, 6, 7. cross-reference: Periodic Table.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A metallic chemical element (symbol Tc) with an atomic number of 43.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun a crystalline metallic element not found in nature; occurs as one of the fission products of uranium

Etymologies

from The American Heritage® Dictionary of the English Language, 4th Edition

[From Greek tekhnētos, artificial, from tekhnāsthai, to make by art, from tekhnē, art; see technical.]

from Wiktionary, Creative Commons Attribution/Share-Alike License

techno- + -ium because it was the first artificially created element.

Examples

  • This test uses very small amounts of a radioactive tracer called technetium to view the liver and spleen.

    DR. SANJIV CHOPRA’S LIVER BOOK

  • This test, also called a technetium sulfur colloid scan, or a liver-spleen scan, is seldom done, but I find it useful in some circumstances, especially if I think my patient may have a condition called focal nodular hyperplasia (FNH) (see pages 223-25).

    DR. SANJIV CHOPRA’S LIVER BOOK

  • Together, these two reactors produce about 60 per cent of the world's supply of an isotope called technetium 99, a radioactive substance used in 85 per cent of diagnostic imaging procedures.

    The Globe and Mail - Home RSS feed

  • Chalk River and Petten together normally produce about 70 percent of the world's supply of an isotope called technetium 99, used in 85 percent of diagnostic imaging procedures.

    ScrippsNews

  • Chalk River and Petten together normally produce about 70 percent of the world's supply of an isotope called technetium 99, used in 85 percent of diagnostic imaging procedures.

    ScrippsNews

  • Together, these two reactors produce about 60 per cent of the world's supply of an isotope called technetium 99, a radioactive substance used in 85 per cent of diagnostic imaging procedures.

    The Globe and Mail - Home RSS feed

  • Together, these two reactors produce about 60 per cent of the world's supply of an isotope called technetium 99, a radioactive substance used in 85 per cent of diagnostic imaging procedures.

    The Globe and Mail - Home RSS feed

  • Together, these two reactors produce about 60 per cent of the world's supply of an isotope called technetium 99, a radioactive substance used in 85 per cent of diagnostic imaging procedures.

    The Globe and Mail - Home RSS feed

  • Scientists from Argentina, Egypt, India and 15 other countries are descending upon the University of Missouri Research Reactor this week to coordinate research and spur commercial development of the substance, called technetium-99.

    seMissourian.com Headlines

  • Scientists from Argentina, Egypt, India and 15 other countries are descending upon the University of Missouri Research Reactor this week to coordinate research and spur commercial development of the substance, called technetium-99.

    seMissourian.com Headlines

Comments

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  • Tc

    December 1, 2007