Isotopes of platinum

Isotopes of platinum (78Pt)
Main isotopes[1] Decay
abun­dance half-life (t1/2) mode pro­duct
190Pt 0.0120% 4.83×1011 y α 186Os
192Pt 0.782% stable
193Pt synth 50 y ε 193Ir
194Pt 32.9% stable
195Pt 33.8% stable
196Pt 25.2% stable
198Pt 7.36% stable
Standard atomic weight Ar°(Pt)

Naturally occurring platinum (78Pt) consists of five stable isotopes (192Pt, 194Pt, 195Pt, 196Pt, 198Pt) and one very long-lived (half-life 4.83×1011 years) radioisotope (190Pt). There are also 34 known synthetic radioisotopes, the longest-lived of which is 193Pt with a half-life of 50 years. All other isotopes have half-lives under a year, most under a day. All isotopes of platinum are either radioactive or observationally stable, meaning that they are predicted to be radioactive but no actual decay has been observed. Platinum-195 is the most abundant isotope.

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