![]() ![]() This procedure produced molybdenum-99, a radionuclide with a longer half-life (2.75 days), which decays to 99mTc. Technetium-99m was discovered as a product of cyclotron bombardment of molybdenum. The same characteristics make the isotope unsuitable for therapeutic use. The relatively "short" physical half-life of the isotope and its biological half-life of 1 day (in terms of human activity and metabolism) allows for scanning procedures which collect data rapidly but keep total patient radiation exposure low. It is well suited to the role, because it emits readily detectable gamma rays with a photon energy of 140 keV (these 8.8 pm photons are about the same wavelength as emitted by conventional X-ray diagnostic equipment) and its half-life for gamma emission is 6.0058 hours (meaning 93.7% of it decays to 99Tc in 24 hours). Technetium-99m is used as a radioactive tracer and can be detected in the body by medical equipment ( gamma cameras). Technetium-99m ( 99mTc) is a metastable nuclear isomer of technetium-99 (itself an isotope of technetium), symbolized as 99mTc, that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope in the world. The first technetium-99m generator, 1958. ![]()
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