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Isotopes of the Element Aluminum

[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
27100%STABLE

Known Isotopes

Mass NumberHalf-lifeDecay ModeBranching Percentage
21< 35 nanosecondsProton EmissionNo Data Available
2291.1 millisecondsElectron Capture with
delayed Alpha Decay
0.04%
Electron Capture100.00%
Electron Capture with
delayed Proton Emission
54.50%
Electron Capture with
delayed Double Proton Emission
1.10%
23446 millisecondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
1.22%
242.053 secondsElectron Capture100.00%
Electron Capture with
delayed Proton Emission
1.6×10-3 %
Electron Capture with
delayed Alpha Decay
0.04%
24m130 millisecondsIsomeric Transition82.50%
Electron Capture17.50%
Electron Capture with
delayed Alpha Decay
0.03%
257.183 secondsElectron Capture100.00%
267.17×10+5 yearsElectron Capture100.00%
26m6.3464 secondsElectron Capture100.00%
27STABLE--
282.2414 minutesBeta-minus Decay100.00%
296.56 minutesBeta-minus Decay100.00%
303.62 secondsBeta-minus Decay100.00%
31644 millisecondsBeta-minus Decay100.00%
3233.0 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
0.70%
3341.7 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
8.50%
3442 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
27.00%
3537.2 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
38.00%
3690 millisecondsBeta-minus Decay100.00%
Beta-minus Decay with
delayed Neutron Emission
< 31.00%
3710.7 millisecondsBeta-minus Decay100.00%
387.6 millisecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
397.6 millisecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
40> 260 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
41> 260 nanosecondsBeta-minus DecayNo Data Available
42> 170 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available
43> 170 nanosecondsBeta-minus DecayNo Data Available
Beta-minus Decay with
delayed Neutron Emission
No Data Available