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Osmium

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Isotopes of the Element Iridium

[Click for Main Data]

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

Naturally Occurring Isotopes

Mass NumberNatural AbundanceHalf-life
19137.3%STABLE
19362.7%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
16494 microsecondsProton Emission> 0.00%
Alpha DecayNo Data Available
Electron CaptureNo Data Available
1651 microsecondsProton Emission (suspected)No Data Available
Alpha Decay (suspected)No Data Available
165m0.30 millisecondsAlpha Decay13.00%
Proton Emission87.00%
16610.5 millisecondsAlpha Decay93.00%
Proton Emission7.00%
166m15.1 millisecondsAlpha Decay98.20%
Proton Emission1.80%
16735.2 millisecondsAlpha Decay48.00%
Proton Emission32.00%
Electron Capture20.00%
167m25.7 millisecondsProton Emission0.40%
Alpha Decay80.00%
Electron Capture20.00%
168222 millisecondsAlpha Decay<= 100.00%
Electron CaptureNo Data Available
Proton EmissionNo Data Available
168m159 millisecondsAlpha Decay77.00%
Electron Capture<= 23.00%
Proton EmissionNo Data Available
1690.353 secondsAlpha Decay45.00%
Electron CaptureNo Data Available
Proton EmissionNo Data Available
169m0.281 secondsElectron CaptureNo Data Available
Proton EmissionNo Data Available
Alpha Decay72.00%
1700.87 secondsElectron Capture94.80%
Alpha Decay5.20%
170m811 millisecondsIsomeric Transition<= 62.00%
Electron Capture<= 62.00%
Alpha Decay38.00%
1713.2 secondsAlpha Decay> 0.00%
Proton EmissionNo Data Available
Electron CaptureNo Data Available
171m1.40 secondsProton Emission<= 42.00%
Electron Capture<= 42.00%
Alpha Decay58.00%
1724.4 secondsElectron Capture98.00%
Alpha Decay~ 2.00%
172m2.0 secondsElectron Capture77.00%
Alpha Decay23.00%
1739.0 secondsElectron Capture> 93.00%
Alpha Decay< 7.00%
173m2.4 secondsElectron CaptureNo Data Available
Alpha Decay7.00%
1747.9 secondsElectron Capture99.50%
Alpha Decay0.50%
174m4.9 secondsElectron Capture97.50%
Alpha Decay2.50%
1759 secondsElectron Capture99.15%
Alpha Decay0.85%
1768.7 secondsElectron Capture96.90%
Alpha Decay3.10%
17730 secondsElectron Capture99.94%
Alpha Decay0.06%
17812 secondsElectron Capture100.00%
17979 secondsElectron Capture100.00%
1801.5 minutesElectron Capture100.00%
1814.90 minutesElectron Capture100.00%
18215 minutesElectron Capture100.00%
18357 minutesElectron Capture100.00%
1843.09 hoursElectron Capture100.00%
18514.4 hoursElectron Capture100.00%
18616.64 hoursElectron Capture100.00%
186m1.90 hoursElectron Capture~ 75.00%
Isomeric Transition~ 25.00%
18710.5 hoursElectron Capture100.00%
187m30.3 millisecondsIsomeric Transition100.00%
18841.5 hoursElectron Capture100.00%
188m4.2 millisecondsElectron Capture (suspected)No Data Available
Isomeric TransitionNo Data Available
18913.2 daysElectron Capture100.00%
189m13.3 millisecondsIsomeric Transition100.00%
189m13.7 millisecondsIsomeric Transition100.00%
19011.78 daysElectron Capture100.00%
190m1.120 hoursIsomeric Transition100.00%
190m13.087 hoursIsomeric Transition8.60%
Electron Capture91.40%
191STABLE--
191m4.899 secondsIsomeric Transition100.00%
191m15.5 secondsIsomeric Transition100.00%
19273.829 daysBeta-minus Decay95.24%
Electron Capture4.76%
192m1.45 minutesIsomeric Transition99.98%
Beta-minus Decay0.02%
192m1241 yearsIsomeric Transition100.00%
193STABLE--
193m10.53 daysIsomeric Transition100.00%
19419.28 hoursBeta-minus Decay100.00%
194m31.85 millisecondsIsomeric Transition100.00%
194m1171 daysBeta-minus Decay100.00%
1952.5 hoursBeta-minus Decay100.00%
195m3.8 hoursBeta-minus Decay95.00%
Isomeric Transition5.00%
19652 secondsBeta-minus Decay100.00%
196m1.40 hoursBeta-minus Decay100.00%
Isomeric Transition< 0.30%
1975.8 minutesBeta-minus Decay100.00%
197m8.9 minutesIsomeric Transition0.25%
Beta-minus Decay99.75%
1988 secondsBeta-minus Decay100.00%
1996 secondsBeta-minus DecayNo Data Available
200> 300 nanosecondsBeta-minus DecayNo Data Available
201> 300 nanosecondsBeta-minus DecayNo Data Available
20211 secondsBeta-minus Decay100.00%
203> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
204No Data AvailableNo Data AvailableNo Data Available