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Isotopes of the Element Selenium

[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
740.89%STABLE
769.37%STABLE
777.63%STABLE
7823.77%STABLE
8049.61%STABLE
828.73%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
64> 180 nanosecondsElectron Capture100.00%
6533 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
100.00%
66No Data AvailableNo Data AvailableNo Data Available
67136 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.50%
6835.5 secondsElectron Capture100.00%
6927.4 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
0.05%
7041.1 minutesElectron Capture100.00%
714.74 minutesElectron Capture100.00%
728.40 daysElectron Capture100.00%
737.15 hoursElectron Capture100.00%
73m39.8 minutesIsomeric Transition72.60%
Electron Capture27.40%
74STABLE--
75119.79 daysElectron Capture100.00%
76STABLE--
77STABLE--
77m17.4 secondsIsomeric Transition100.00%
78STABLE--
792.95×10+5 yearsBeta-minus Decay100.00%
79m3.92 minutesIsomeric Transition99.94%
Beta-minus Decay0.06%
80STABLE--
8118.45 minutesBeta-minus Decay100.00%
81m57.28 minutesIsomeric Transition99.95%
Beta-minus Decay0.05%
82STABLE--
8322.3 minutesBeta-minus Decay100.00%
83m70.1 secondsBeta-minus Decay100.00%
843.26 minutesBeta-minus Decay100.00%
8532.9 secondsBeta-minus Decay100.00%
8614.3 secondsBeta-minus Decay100.00%
875.50 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.20%
881.53 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.67%
890.41 secondsBeta-minus Decay with
delayed Neutron Emission
7.80%
Beta-minus Decay100.00%
90> 300 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
910.27 secondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
21.00%
92No Data AvailableBeta-minus Decay100.00%
93No Data AvailableBeta-minus Decay100.00%
94> 150 nanosecondsBeta-minus Decay100.00%
95> 300 nanosecondsBeta-minus Decay (suspected)No Data Available
95m300 nanosecondsBeta-minus Decay with
delayed Neutron Emission (suspected)  
No Data Available
95m1> 300 nanoseconds   Beta-minus Decay with delayed
Double Neutron Emission (suspected)
No Data Available