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Isotopes of the Element Ruthenium

[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
965.54%STABLE
981.87%STABLE
9912.76%STABLE
10012.60%STABLE
10117.06%STABLE
10231.55%STABLE
10418.62%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
871.5 microsecondsElectron Capture (suspected)No Data Available
881.2 secondsElectron Capture100.00%
891.5 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
< 0.15%
9011.7 secondsElectron Capture100.00%
917.9 secondsElectron Capture100.00%
91m7.6 secondsIsomeric TransitionNo Data Available
Electron Capture> 0.00%
Electron Capture with
delayed Proton Emission
> 0.00%
923.65 minutesElectron Capture100.00%
9359.7 secondsElectron Capture100.00%
93m10.8 secondsElectron Capture78.00%
Isomeric Transition22.00%
Electron Capture with
delayed Proton Emission
0.03%
9451.8 minutesElectron Capture100.00%
951.643 hoursElectron Capture100.00%
96STABLE--
972.83 daysElectron Capture100.00%
98STABLE--
99STABLE--
100STABLE--
101STABLE--
102STABLE--
10339.247 daysBeta-minus Decay100.00%
104STABLE--
1054.44 hoursBeta-minus Decay100.00%
106371.8 daysBeta-minus Decay100.00%
1073.75 minutesBeta-minus Decay100.00%
1084.55 minutesBeta-minus Decay100.00%
10934.5 secondsBeta-minus Decay100.00%
11011.6 secondsBeta-minus Decay100.00%
1112.12 secondsBeta-minus Decay100.00%
1121.75 secondsBeta-minus Decay100.00%
1130.80 secondsBeta-minus Decay100.00%
113m510 millisecondsBeta-minus Decay100.00%
1140.52 secondsBeta-minus Decay100.00%
115318 millisecondsBeta-minus DecayNo Data Available
115m740 millisecondsBeta-minus Decay with
delayed Neutron Emission
No Data Available
Beta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
Beta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
Beta-minus Decay100.00%
116204 millisecondsBeta-minus DecayNo Data Available
117142 millisecondsBeta-minus Decay100.00%
118123 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
119> 300 nanosecondsBeta-minus DecayNo Data Available
120> 150 nanosecondsBeta-minus DecayNo Data Available
121> 390 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
122> 392 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
123> 394 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
Beta-minus Decay with delayed  
Double Neutron Emission
No Data Available
124> 396 nanoseconds   Beta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available