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There are two natural isotopes of iridium (77 Ir), and 37 radioisotopes, the most stable radioisotope being 192 Ir with a half-life of 73.83 days, and many nuclear isomers, the most stable of which is 192m2 Ir with a half-life of 241 years. All other isomers have half-lives under a year, most under a day.
Iridium-192 (symbol 192 Ir) is a radioactive isotope of iridium, with a half-life of 73.827 days. [1] It decays by emitting beta (β) particles and gamma (γ) radiation. About 96% of 192 Ir decays occur via emission of β and γ radiation, leading to 192 Pt. Some of the β particles are captured by other 192 Ir nuclei, which are then converted ...
192 Ir, which falls between the two stable isotopes, is the most stable radioisotope, with a half-life of 73.827 days, and finds application in brachytherapy [28] and in industrial radiography, particularly for nondestructive testing of welds in steel in the oil and gas industries; iridium-192 sources have been involved in a number of ...
This page lists radioactive nuclides by their half-life.
Cobalt-60 tends to be used in teletherapy units as a higher photon energy alternative to caesium-137, while iridium-192 tends to be used in a different mode of therapy, internal radiotherapy or brachytherapy. The iridium wires for brachytherapy are a palladium-coated iridium/palladium alloy wire made radioactive by neutron activation.
Iridium-192 from NRU is used in several industries to inspect welds or other metal components to ensure they are safe for use. The core of the NRU reactor was about 3 metres (9.8 ft) wide and 3 metres (9.8 ft) high, which is unusually large for a research reactor. That large volume enabled the bulk production of isotopes.
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This is the longest half-life directly measured for any unstable isotope; [4] only the half-life of tellurium-128 is longer. [ citation needed ] Of the chemical elements, only 1 element ( tin ) has 10 such stable isotopes, 5 have 7 stable isotopes, 7 have 6 stable isotopes, 11 have 5 stable isotopes, 9 have 4 stable isotopes, 5 have 3 stable ...