It's Elemental - Isotopes of the Element Aluminum

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Most of the isotope data on this site has been obtained from the National Nuclear Data Center. Please visit their site for more information.

Isotopes of the Element Aluminum with a Known Natural Abundance

Mass Number	Natural Abundance	Half-life

27	100%	Stable

All Known Isotopes of the Element Aluminum

Mass Number	Half-life	Decay Mode	Branching Percentage

21	< 35 nanoseconds	Proton Emission	No Data Available

22	59 milliseconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	~ 60.00

		Electron Capture	0.90

		Electron Capture with delayed Alpha Decay	0.31

23	0.47 seconds	Electron Capture	100.00

		Electron Capture with delayed Proton Emission	~ 1.10

24	2.053 seconds	Electron Capture	100.00

		Electron Capture with delayed Alpha Decay	0.04

		Electron Capture with delayed Proton Emission	1.6E-3

24_m	131.3 milliseconds	Isomeric Transition	82.00

		Electron Capture	18.00

		Electron Capture with delayed Alpha Decay	0.03

25	7.183 seconds	Electron Capture	100.00

26	7.17×10⁺⁵ years	Electron Capture	100.00

26_m	6.3452 seconds	Electron Capture	100.00

27	Stable	-	-

28	2.2414 minutes	Beta-minus Decay	No Data Available

29	6.56 minutes	Beta-minus Decay	100.00

30	3.60 seconds	Beta-minus Decay	100.00

31	644 milliseconds	Beta-minus Decay	100.00

32	33 milliseconds	Beta-minus Decay	100.00

33	41 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	8.50

34	42 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	27.00

35	150 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	65.00

36	90 milliseconds	Beta-minus Decay	100.00

		Beta-minus Decay with delayed Neutron Emission	< 31.00

37	No Data Available	Beta-minus Decay	100.00

38	No Data Available	No Data Available	No Data Available

39	> 200 nanoseconds	Beta-minus Decay	No Data Available

40	> 260 nanoseconds	Beta-minus Decay	No Data Available

		Beta-minus Decay with delayed Neutron Emission	No Data Available

41	> 260 nanoseconds	Beta-minus Decay	No Data Available