It's Elemental - Isotopes of the Element Iridium

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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 Iridium with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

191	37.3%	Stable

193	62.7%	Stable

All Known Isotopes of the Element Iridium

Mass Number	Half-life	Decay Mode	Branching Percentage

164	0.11 milliseconds	Proton Emission	100.00

165	< 1 microseconds	No Data Available	No Data Available

165_m	0.30 milliseconds	Proton Emission	87.00

		Alpha Decay	13.00

166	10.5 milliseconds	Alpha Decay	93.10

		Proton Emission	6.90

166_m	15.1 milliseconds	Alpha Decay	98.20

		Proton Emission	1.80

167	35.2 milliseconds	Alpha Decay	48.00

		Proton Emission	32.00

		Electron Capture	20.00

167_m	30.0 milliseconds	Alpha Decay	80.00

		Electron Capture	20.00

		Proton Emission	0.40

168	0.161 milliseconds	Alpha Decay	82.00

169	0.6 milliseconds	Alpha Decay	50.00

169_m	0.32 seconds	Alpha Decay	84.00

		Electron Capture	No Data Available

		Proton Emission	No Data Available

170	1.05 seconds	Alpha Decay	75.00

		Electron Capture	25.00

171	1.46 seconds	Alpha Decay	58.00

		Electron Capture	<= 42.00

172	4.4 seconds	Electron Capture	98.00

		Alpha Decay	~ 2.00

172_m	2.0 seconds	Electron Capture	77.00

		Alpha Decay	23.00

173	2.4 seconds	Alpha Decay	7.00

		Electron Capture	No Data Available

173_m	9.0 seconds	Electron Capture	> 93.00

		Alpha Decay	< 7.00

174	7.9 seconds	Electron Capture	99.50

		Alpha Decay	0.50

174_m	4.9 seconds	Electron Capture	97.50

		Alpha Decay	2.50

175	9 seconds	Electron Capture	99.15

		Alpha Decay	0.85

176	8.3 seconds	Electron Capture	96.90

		Alpha Decay	3.10

177	30 seconds	Electron Capture	99.94

		Alpha Decay	0.06

178	12 seconds	Electron Capture	100.00

179	79 seconds	Electron Capture	100.00

180	1.5 minutes	Electron Capture	100.00

181	4.90 minutes	Electron Capture	100.00

182	15 minutes	Electron Capture	100.00

183	57 minutes	Electron Capture	100.00

184	3.09 hours	Electron Capture	100.00

185	14.4 hours	Electron Capture	100.00

186	16.64 hours	Electron Capture	100.00

186_m	1.90 hours	Electron Capture	~ 75.00

		Isomeric Transition	~ 25.00

187	10.5 hours	Electron Capture	100.00

188	41.5 hours	Electron Capture	100.00

188_m	4.2 milliseconds	No Data Available	No Data Available

189	13.2 days	Electron Capture	100.00

190	11.78 days	Electron Capture	100.00

190_m	1.120 hours	Isomeric Transition	100.00

190_m2	3.087 hours	Electron Capture	91.40

		Isomeric Transition	8.60

191	Stable	-	-

191_m	4.94 seconds	Isomeric Transition	100.00

191_m2	5.5 seconds	Isomeric Transition	100.00

192	73.827 days	Beta-minus Decay	95.13

		Electron Capture	4.87

192_m	1.45 minutes	Isomeric Transition	99.98

		Beta-minus Decay	0.02

192_m2	241 years	Isomeric Transition	100.00

193	Stable	-	-

193_m	10.53 days	Isomeric Transition	100.00

194	19.28 hours	Beta-minus Decay	100.00

194_m	171 days	Beta-minus Decay	100.00

195	2.5 hours	Beta-minus Decay	100.00

195_m	3.8 hours	Beta-minus Decay	95.00

		Isomeric Transition	5.00

196	52 seconds	Beta-minus Decay	100.00

196_m	1.40 hours	Beta-minus Decay	~ 100.00

		Isomeric Transition	< 0.30

197	5.8 minutes	Beta-minus Decay	100.00

197_m	8.9 minutes	Beta-minus Decay	99.75

		Isomeric Transition	0.25

198	8 seconds	Beta-minus Decay	100.00

199	No Data Available	Beta-minus Decay	No Data Available