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Isotopes of the Element Osmium

[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
1840.02%> 5.6×1013 years
1861.59%2.0×10+15 years

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
1610.64 millisecondsAlpha Decay100.00%
1622.1 millisecondsAlpha Decay~ 99.00%
1635.5 millisecondsAlpha Decay100.00%
Electron CaptureNo Data Available
16421 millisecondsAlpha Decay98.00%
Electron Capture2.00%
16571 millisecondsElectron Capture< 40.00%
Alpha Decay> 60.00%
166199 millisecondsAlpha Decay72.00%
Electron Capture18.00%
1670.81 secondsAlpha Decay57.00%
Electron Capture43.00%
1682.1 secondsElectron Capture57.00%
Alpha Decay43.00%
1693.43 secondsElectron Capture86.30%
Alpha Decay13.70%
1707.37 secondsAlpha Decay9.50%
Electron Capture90.50%
1718.3 secondsElectron Capture98.20%
Alpha Decay1.80%
17219.2 secondsElectron Capture99.80%
Alpha Decay0.20%
17322.4 secondsElectron CaptureNo Data Available
Alpha Decay0.4%
17444 secondsElectron Capture99.98%
Alpha Decay0.02%
1751.4 minutesElectron Capture100.00%
1763.6 minutesElectron Capture100.00%
1773.0 minutesElectron Capture100.00%
1785.0 minutesElectron Capture100.00%
Alpha DecayNo Data Available
1796.5 minutesElectron Capture100.00%
18021.5 minutesElectron Capture100.00%
181105 minutesElectron Capture100.00%
181m2.7 minutesElectron Capture100.00%
Isomeric Transition<= 3.00%
18221.84 hoursElectron Capture100.00%
182m0.78 millisecondsIsomeric Transition100.00%
18313.0 hoursElectron Capture100.00%
183m9.9 hoursElectron Capture85.00%
Isomeric Transition15.00%
184> 5.6×1013 yearsAlpha DecayNo Data Available
18593.6 daysElectron Capture100.00%
1862.0×10+15 yearsAlpha Decay100.00%
189m5.81 hoursIsomeric Transition100.00%
190m9.9 minutesIsomeric Transition100.00%
19115.4 daysBeta-minus Decay100.00%
191m13.10 hoursIsomeric Transition100.00%
192m5.9 secondsIsomeric Transition> 87.00%
Beta-minus Decay< 13.00%
19330.11 hoursBeta-minus Decay100.00%
1946.0 yearsBeta-minus Decay100.00%
195≈ 9 minutesBeta-minus DecayNo Data Available
19634.9 minutesBeta-minus Decay100.00%
1972.8 minutesBeta-minus Decay100.00%
198No Data AvailableBeta-minus Decay100.00%
1995 secondsBeta-minus Decay100.00%
2006 secondsBeta-minus Decay100.00%
201> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
202> 300 nanosecondsBeta-minus Decay (suspected)No Data Available