It's Elemental - Isotopes of the Element Osmium

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Osmium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

184	0.02%	> 5.6×10⁺¹³ years

186	1.59%	2.0×10⁺¹⁵ years

187	1.6%	Stable

188	13.29%	Stable

189	16.21%	Stable

190	26.36%	Stable

192	40.93%	Stable

All Known Isotopes of the Element Osmium

Mass Number	Half-life	Decay Mode	Branching Percentage

162	1.7 milliseconds	Alpha Decay	100.00

163	5.5 milliseconds	Alpha Decay	~ 100.00

		Electron Capture	No Data Available

164	21 milliseconds	Alpha Decay	98.00

		Electron Capture	2.00

165	71 milliseconds	Alpha Decay	> 60.00

		Electron Capture	< 40.00

166	181 milliseconds	Alpha Decay	72.00

		Electron Capture	18.00

167	0.81 seconds	Alpha Decay	57.00

		Electron Capture	43.00

168	2.1 seconds	Alpha Decay	40.00

		Electron Capture	No Data Available

169	3.6 seconds	Electron Capture	89.00

		Alpha Decay	11.00

170	7.3 seconds	Electron Capture	88.00

		Alpha Decay	12.00

171	8.3 seconds	Electron Capture	98.2

		Alpha Decay	1.80

172	19.2 seconds	Alpha Decay	1.10

		Electron Capture	No Data Available

173	22.4 seconds	Alpha Decay	0.4

		Electron Capture	No Data Available

174	44 seconds	Electron Capture	99.98

		Alpha Decay	0.02

175	1.4 minutes	Electron Capture	100.00

176	3.6 minutes	Electron Capture	100.00

177	2.8 minutes	Electron Capture	100.00

178	5.0 minutes	Electron Capture	100.00

179	6.5 minutes	Electron Capture	100.00

180	21.5 minutes	Electron Capture	100.00

181	105 minutes	Electron Capture	100.00

181_m	2.7 minutes	Electron Capture	100.00

182	22.10 hours	Electron Capture	100.00

183	13.0 hours	Electron Capture	100.00

183_m	9.9 hours	Electron Capture	85.00

		Isomeric Transition	15.00

184	> 5.6×10⁺¹³ years	Alpha Decay	No Data Available

185	93.6 days	Electron Capture	100.00

186	2.0×10⁺¹⁵ years	Alpha Decay	100.00

187	Stable	-	-

188	Stable	-	-

189	Stable	-	-

189_m	5.8 hours	Isomeric Transition	100.00

190	Stable	-	-

190_m	9.9 minutes	Isomeric Transition	100.00

191	15.4 days	Beta-minus Decay	100.00

191_m	13.10 hours	Isomeric Transition	100.00

192	Stable	-	-

192_m	5.9 seconds	Isomeric Transition	> 87.00

		Beta-minus Decay	< 13.00

193	30.11 hours	Beta-minus Decay	100.00

194	6.0 years	Beta-minus Decay	100.00

195	≈ 9 minutes	Beta-minus Decay	No Data Available

196	34.9 minutes	Beta-minus Decay	100.00