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Isotopes of the Element Iridium

[Click for Main Data]         Proton Emission     Neutron Emission     Electron Emission     Positron Emission

Most of the isotope data on this site has been obtained from the National Nuclear Data Center.

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 nanoseconds   Beta-minus Decay (suspected)   No Data Available
204No Data AvailableNo Data AvailableNo Data Available