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Isotopes of the Element Iron

[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
545.845%STABLE
5691.754%STABLE
572.119%STABLE
580.282%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
451.89 millisecondsDouble Proton Emission70.00%
Electron Capture<= 30.00%
Electron Capture with
delayed Proton Emission
19.00%
Electron Capture with
delayed Double Proton Emission
7.80%
Electron Capture with
delayed Triple Proton Emission
3.30%
4613.0 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
78.70%
4721.9 millisecondsElectron Capture with
delayed Proton Emission
88.4%
Electron Capture with
delayed Double Proton Emission
No Data Available
Electron Capture100.00%
4845.3 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
15.90%
4964.7 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
56.70%
50155 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission (suspected)  
No Data Available
51305 millisecondsElectron Capture100.00%
528.275 hoursElectron Capture100.00%
52m45.9 secondsIsomeric Transition< 4.0×10-3 %
Electron Capture100.00%
538.51 minutesElectron Capture100.00%
53m2.54 minutesIsomeric Transition100.00%
54STABLE--
552.744 yearsElectron Capture100.00%
56STABLE--
57STABLE--
58STABLE--
5944.495 daysBeta-minus Decay100.00%
602.62×10+6 yearsBeta-minus Decay100.00%
615.98 minutesBeta-minus Decay100.00%
6268 secondsBeta-minus Decay100.00%
636.1 secondsBeta-minus Decay100.00%
642.0 secondsBeta-minus Decay100.00%
650.81 secondsBeta-minus Decay100.00%
65m1.12 secondsBeta-minus Decay100.00%
66440 millisecondsBeta-minus Decay100.00%
670.40 secondsBeta-minus Decay100.00%
68180 millisecondsBeta-minus Decay100.00%
69110 millisecondsBeta-minus Decay100.00%
7071 millisecondsBeta-minus Decay100.00%
7128 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
No Data Available
72>= 150 nanoseconds   Beta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
27.60%
73> 633 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
74> 638 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