Isotopes of iridium

Isotopes of iridium (77Ir)
Main isotopes Decay
Isotope abun­dance half-life (t1/2) mode pro­duct
189Ir synth 13.2 d ε 189Os
190Ir synth 11.751 d ε 190Os
191Ir 37.3% stable
192Ir synth 73.82 d β− 192Pt
ε 192Os
192m2Ir synth 241 y IT 192Ir
193Ir 62.7% stable
Standard atomic weight Ar°(Ir)

There are two natural isotopes of iridium (77Ir), 191Ir and 193Ir, both stable. In addition, there are 40 known radioisotopes with mass numbers 164 through 205, the most stable being 192Ir with a half-life of 73.82 days, and many nuclear isomers, the most stable of which is 192m2Ir with a half-life of 241 years. All other nuclides have half-lives under two weeks, most under a day. All isotopes of iridium are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed.

The isotope 191Ir was the first one of any element to be shown to present a Mössbauer effect. This renders it useful for Mössbauer spectroscopy for research in physics, chemistry, biochemistry, metallurgy, and mineralogy.

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