technetium 99

tech·ne·ti·um 99 (99Tc),

(tek-nē'shē-ŭm),
A radioisotope of technetium that is the decay product of technetium-99m and has a weak beta emission and a physical half-life of 213,000 years.

technetium 99 (teknē´shēəm),

n the radionuclide most commonly used to image the body in nuclear medicine scans. It is preferred because of its short half-life and because the emitted photon has an appropriate energy for imaging techniques.
References in periodicals archive ?
Technetium 99 scan reveals the radioactive uptake of thyroid tissue.
Contract notice: Open tender for the supply of molybdenum-99 generators, technetium 99 m necessary to meet the business needs of the usl romagna for the service activities of nuclear medicine in cesena, faenza, forlE1/4 and the irccs-irst
Operational definitions Myocardial Perfusion Scan (MPS) Myocardial perfusion SPECT scan was done using metastable Technetium 99 (Tc-99m) 2- methoxy-isobutyl-isonitrile (MIBI) or Thallium 201 (Tl-201) thallous chloride.
Kevin Rosso, the associate director for PNNL's Physical Sciences Division and other researchers, investigated the ability of iron-rich minerals in Hanford soil to change technetium 99 into a form that sticks in the soil.
The SDLP's Eddie McGrady, who has campaigned for the closure of the Cumbrian facility, welcomed moves to cut discharges of the radionuclide Technetium 99 by 90 per cent from the plant.
Trials will start this autumn on an alternative disposal method for controversial Technetium 99 (Tc-99).
The new scare comes after cancer-causing technetium 99 - which for years has been pouring into the Irish Sea from Sellafield - was found in Norway, which shares the same tidal chain with Scotland's west coast islands.
Alun Pugh, AM for Clwyd West, says the nuclear-reprocessing plant is putting residents in North Wales at risk by increasing discharges of the radioactive substance technetium 99 into the Irish Sea.
Among the contaminants reported to have been in groundwater samples from the west side of the river were strontium 90 and technetium 99, in addition to volatile organic compounds and arsenic and selenium.
The substance, Technetium 99, has already polluted much of the Irish Sea and has been found at alarming levels in lobsters.
The board said the draft study showed the other methods would release unacceptable amounts of radioactive technetium 99 and other contaminants to the groundwater beneath Hanford.
The leaking material, known as technetium 99, remains toxic for 200,000 years and accumulates in the bodies of shellfish and lobsters.