<unk> <unk>  is a metastable nuclear isomer of<unk> (itself an isotope of technetium), symbolized as<unk> , that is used in tens of millions of medical diagnostic procedures annually, making it the most commonly used medical radioisotope in the world.<unk>  is used as a radioactive tracer and can be detected in the body by medical equipment (gamma cameras). 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<unk>  in 24 hours). 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. The same characteristics make the isotope unsuitable for therapeutic use.<unk>  was discovered as a product of cyclotron bombardment of molybdenum. This procedure produced molybdenum-99, a radionuclide with a longer half-life (2.75 days), which decays to<unk> . This longer decay time allows for<unk> o to be shipped to medical facilities, where<unk>  is extracted from the sample as it is produced. In turn,<unk> o is usually created commercially by fission of highly enriched uranium in a small number of research and material testing nuclear reactors in several countries.
Technetium-99m
Technetium 
Strontium-90
Radium-223
Dotinurad
Rubidium-82 chloride
Methylene blue
Fenpentadiol