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Reference.org
Isotopes of iridium
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<p>There are two natural <a href="/facts/Isotopes/KD9B1y6o">isotopes</a> of <a href="/facts/Iridium/TFQutoj1">iridium</a> (77Ir), and 37 <a href="/facts/Radioisotope/5WpCfbdq">radioisotopes</a>, the most stable radioisotope being <a href="/facts/Iridium-192/F1zVVPRq">192Ir</a> with a <a href="/facts/Half-life/kGVH8BAB">half-life</a> of 73.83 days, and many <a href="/facts/Nuclear_isomer/L8DHcqnk">nuclear isomers</a>, the most stable of which is 192m2Ir with a half-life of 241 years. All other isomers have half-lives under a year, most under a day. All isotopes of iridium are either radioactive or <a href="/facts/Observationally_stable/vC0VVvqN">observationally stable</a>, meaning that they are predicted to be radioactive but no actual decay has been observed. </p>