Trace Sciences International

Osmium Isotopes

Nominal Mass
Accurate Mass
% Natural Abundance
Chemical Form
Enrichment Available %

186 Os

185.953830 (4)

1.59 (3)

metal

38+

187 Os

186.955741 (3)

1.96 (2)

metal

99+

188 Os

187.955830 (3)

13.24 (8)

metal

66

189 Os

188.958137 (4)

16.15 (5)

metal

79+

190 Os

189.958436 (4)

26.26 (2)

metal

92+

192 Os

191.961467 (4)

40.78 (19)

metal

99+

Osmium Isotopes are used for the production of radioisotopes and in scientific experiments. Os-192 can be used for the production of the medical radioisotope Pt-195m. Os-184 is used for the production of the radioisotope Os-185. Os-191 can be used for the production of the radioisotopes Os-192. Os-190 has been used as a tracer to determine Os abundance in meteorites using isotope dilution ICP-MS. Finally, Os-189 has been used to experiment with nuclear excitation by electronic transition.