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

  • n. A silvery-gray radioactive metal, the first synthetically produced element, having 14 isotopes with masses ranging from 92 to 105 and half-lives up to 4.2 × 106 years. It is used as a tracer and to eliminate corrosion in steel. Atomic number 43; melting point 2,200°C; specific gravity 11.50; valence 0, 2, 4, 5, 6, 7. See Table at element.

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

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

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


From Greek tekhnētos, artificial, from tekhnāsthai, to make by art, from tekhnē, art; see technical.
(American Heritage® Dictionary of the English Language, Fourth Edition)
techno- + -ium because it was the first artificially created element. (Wiktionary)


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


  • 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).


  • 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.


  • 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. Headlines

  • Radioactive drugs such as technetium, strontium, or iodine can cause you to emit radiation through your skin, feces, and urine.

    Q&A: Second-hand radiation risk?

  • Physicians use medical isotopes such as technetium 99 to save lives, but terrorists could use the production byproducts to build crude nuclear weapons.

    Web Edition | Bulletin of the Atomic Scientists

  • The atomic mass of a totally synthetic element, such as technetium, is the atomic mass number of the most commonly synthesized isotope, or the first such isotope reported.

    CreationWiki - Recent changes [en]

  • The Kurion facility has four separate lines, with each consisting of six zeolite-containing cartridges: one for removing oil and radioactive technetium, four for radioactive cesium, and one for iodine.

    Decontamination System Set to Restart at Tepco Daiichi Plant

  • After the first five hours of operation, Tepco found that the cartridge for removing oil and technetium was absorbing radioactive material far more than initially projected, indicating the need to frequently change the cartridges.

    Decontamination System Set to Restart at Tepco Daiichi Plant


Log in or sign up to get involved in the conversation. It's quick and easy.