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a chemical element, atomic number 43, atomic weight 99, symbol Tc. (See Appendix 6.)
technetium 99m the most frequently used radioisotope in nuclear medicine, a gamma emitter having a half-life of 6.01 hours.
Miller-Keane Encyclopedia and Dictionary of Medicine, Nursing, and Allied Health, Seventh Edition. © 2003 by Saunders, an imprint of Elsevier, Inc. All rights reserved.

tech·ne·ti·um (Tc),

An artificial radioactive element, atomic no. 43, atomic wt. 99, produced in 1937 by bombardment of molybdenum by deuterons; also a product of the fission of 235U; used extensively as a radiographic tracer in imaging studies of internal organs.
[G. technetos, artificial]
Farlex Partner Medical Dictionary © Farlex 2012


(Tc) (tek-nē'shē-ŭm)
A radioisotope of technetium that decays by isomeric transition, emitting an essentially monoenergetic gamma ray of 142 keV with a half-life of 6.01 hr. It is usually obtained from a radionuclide generator of molybdenum 99 and is used to prepare radiopharmaceuticals for scanning the brain, parotid, thyroid, lungs, blood pool, liver, heart, spleen kidney, lacrimal drainage apparatus, bone, and bone marrow.
[G. technetos, artificial]
Medical Dictionary for the Health Professions and Nursing © Farlex 2012


An artificial radioactive element that can be incorporated into various molecules for use in RADIONUCLIDE SCANNING.
Collins Dictionary of Medicine © Robert M. Youngson 2004, 2005


A radioactive isotope frequently used in radionuclide scanning of the heart and other organs. It is produced during nuclear fission reactions.
Gale Encyclopedia of Medicine. Copyright 2008 The Gale Group, Inc. All rights reserved.
References in periodicals archive ?
99M is an 11-storey, 22,000 square metre, LEED Gold, class-A office development in Washington, D.C.'s Capitol Riverfront.
Additionally, the Mo-99 produced by NorthStar's RadioGenix System, a proprietary one-of-a-kind automated radioisotope separation system that utilizes a worldwide patented on-board, on-demand, point-of-use sterilization system to produce USP compliant Sodium Pertechnetate Tc 99m Injection in the same form that is offered today by all other suppliers and which is expected by today's nuclear pharmacist.
(99m) Tc-sestamibi scintigraphy and cell cycle in parathyroid glands of secondary hyperparathyroidism.
It is other members of the LMA who happily take over from a sacked manager (sometimes agreeing to do so even with the current manager still in position) and it is also LMA members who have benefitted most from the pounds 99m being handed out by clubs.
Most government hospitals depend on the Bhabha Atomic Research Centre ( BARC), which produces Molybdenum- 99, from which Technetium- 99m is extracted.
Magners maker C&C reported underlying operating profits of pounds 99m in the year to February 29 against pounds 157.9m the previous year after a wet summer hit sales.
It came as the Merseyside glass maker posted a 22% hike in first-half profits to pounds 99m, despite tough market conditions and soaring energy costs.
It came as the Merseyside glass maker posted a 22pc increase in first-half profits to pounds 99m despite tough markets and soaring energy costs.
(Built in 1929 in Akron, Ohio, Goodyear was 358m x 99m and a mere 34m high.) Designed by SIAT architects and engineered by Arup, CargoLifter looms over its flat site, its translucent membrane skin stretched taut over an arched steel structure.
Currently, 2 leukocyte-labeling radiopharmaceuticals are used for infection scintigraphy: indium In 111 and technetium Tc 99m. Both primarily label neutrophil leukocytes.[6] Used in conjunction with other molecules, both In 111 and Tc 99m have several different scintigraphic applications, with Tc 99m in much wider clinical use.