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Isotopes of Aluminium

List, data and properties of all known isotopes of Aluminium.

Content
Atomic properties
Decay properties
NMR active nuclides
Radiation protection
References
Aluminium isotopes

There are 22 known isotopes of the chemical element aluminium, as well as several nuclear isomers. The stable isotope 27Al (almost 100%) and the radioisotope 26Al (in traces, half-life approx. 720,000 years) occur in nature. All other isotopes are unstable with small half-lives of less than 7 minutes or much less.

 

Naturally Occurring Aluminium Isotopes

The natural isotope composition (isotope ratio) of naturally occurring aluminum can vary to a greater or lesser extent.

Atomic Mass maQuantityHalf-lifeSpin
Aluminium
Isotopic mixture		26,9815384 u100 %
Isotope 26Al25,98689186(7) utraces7.17(24) × 105 a5+
Isotope 27Al26,9815385(7) u100 %stable5/2+

 

Isotope Table: Aluminium

The two following tables list the most important data and properties of the Aluminium isotopes. Further information on the individual Aluminium isotopes is listed on separate pages and can be accessed via the link in column 1.

 

Atomic Properties

Isotope
Nuclide		ENAtomic Mass
[Nuclear Mass]
{Mass Excess}		Spin I
(h/2π)		Parent
123456
Aluminium-212113Al821.02897(64) u
[21.0218385 u]
{26.98538 MeV}		(5/2+)
Aluminium-222213Al922.01954(43) u
[22.0124085 u]
{18.20139 MeV}		(4)+22Si
Aluminium-232313Al1023.0072444(4) u
[23.0001129 u]
{6.74812 MeV}		5/2+23Si
Aluminium-242413Al1123.99994754(25) u
[23.9928161 u]
{-0.04887 MeV}		4+24Si
Aluminium-24m24m13Al1123.99994754(25) u
[23.9928161 u]
{-0.04887 MeV}		1+
Aluminium-252513Al1224.99042831(7) u
[24.9832968 u]
{-8.91597 MeV}		5/2+25Si
26P
27S
Aluminium-262613Al1325.98689186(7) u
[25.9797604 u]
{-12.21015 MeV}		5+26Si
27P
Aluminium-26m26m13Al1325.98689186(7) u
[25.9797604 u]
{-12.21015 MeV}		0+
Aluminium-272713Al1426.9815385(7) u
[26.974407 u]
{-17.19678 MeV}		5/2+27Mg
27Si
28P
Aluminium-282813Al1527.98191009(8) u
[27.9747786 u]
{-16.85064 MeV}		3+28Mg
Aluminium-292913Al1628.9804532(4) u
[28.9733217 u]
{-18.20773 MeV}		5/2+29Mg
Aluminium-303013Al1729.982968(3) u
[29.9758365 u]
{-15.86521 MeV}		3+30Mg
Aluminium-313113Al1830.9839498(24) u
[30.9768183 u]
{-14.95066 MeV}		5/2(+)31Mg
Aluminium-323213Al1931.988084(8) u
[31.9809525 u]
{-11.09968 MeV}		1+32Mg
33Mg
Aluminium-32m32m13Al1931.988084(8) u
[31.9809525 u]
{-11.09968 MeV}		(4+)
Aluminium-333313Al2032.990878(8) u
[32.9837465 u]
{-8.49709 MeV}		(5/2)+33Mg
34Mg
Aluminium-343413Al2133.996779(3) u
[33.9896475 u]
{-3.00034 MeV}		(4-)34Mg
Aluminium-353513Al2234.999760(8) u
[34.9926285 u]
{-0.22356 MeV}		(5/2+)
Aluminium-363613Al2336.00639(16) u
[35.9992585 u]
{5.95225 MeV}
Aluminium-373713Al2437.01053(19) u
[37.0033985 u]
{9.80863 MeV}		5/2+
Aluminium-383813Al2538.0174(4) u
[38.0102685 u]
{16.208 MeV}		(0-)
Aluminium-393913Al2639.02217(43) u
[39.0150385 u]
{20.65122 MeV}		(5/2+)
Aluminium-404013Al2740.02962(43) u
[40.0224885 u]
{27.59085 MeV}
Aluminium-414113Al2841.03588(54) u
[41.0287485 u]
{33.422 MeV}		5/2+
Aluminium-424213Al2942.04305(64) u
[42.0359185 u]
{40.10082 MeV}
Aluminium-434313Al3043.05048(86) u
[43.0433485 u]
{47.02182 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayExtern
Half-lifeDecay ModeProbabilityEnergy
789101112
Al-2135 nsp → 20Mg?AL
Al-2291.1(5) msβ+ → 22Mg
β+, p → 21Na
β+, 2p → 20Ne
β+, α → 18Ne		43.862 %
55 %
1.1 %
0.038 %		18.6(4) MeV


AL
Al-23470(30) msEC/β+ → 23Mg
β+, p → 22Na		95.54 %
0.46 %		12.2216(4) MeV
AL
Al-242.053(4) sEC/β+ → 24Mg
β+, p → 23Na
β+, α → 20Ne		99.96 %
0.0016 %
0.035 %		13.88470(23) MeV
2.184 MeV
4.560 MeV		AL
Al-24m130(3) msEC/β+ → 24Mg
ε, α → 20Ne
Iso → 24Al		17.5(30) %
0.028(6) %
82.5(30) %		14.302 MeV
4.986 MeV
0.426 MeV		AL
Al-257.183(12) sEC/β+ → 25Mg100 %4.27681(8) MeVAL
Al-267.17(24) × 105 aEC β+ → 26Mg100 %4.00439(7) MeVAL
Al-26m6.3460(8) sEC β+ → 26Mg100 %4.233 MeVAL
Al-27stableAL
Al-282.245(2) minβ- → 28Si100 %4.64215(8) MeVAL
Al-296.56(6) minβ- → 29Si100 %3.687(3) MeVAL
Al-303.62(6) sβ- → 30Si100 %8.5681(29) MeVAL
Al-31644(25) msβ- → 31Si
β-, n → 30Si		98.4 %
1.6 %		7.9983(22) MeV
1.4109(22) MeV		AL
Al-3233.0(2) msβ- → 32Si
β-, n → 31Si		99.3(5) %
0.7(5) %		12.978(7) MeV
3.778(7) MeV		AL
Al-32m200(20) nsIso → 32Al100 %AL
Al-3341.7(2) msβ- → 33Si
β-, n → 32Si		91.5(5) %
8.5(7) %		12.017(7) MeV
7.509(7) MeV		AL
Al-3456.3(5) msβ- → 34Si
β-, n → 33Si		74(4) %
26(4) %		16.957(14) MeV
9.443(3) MeV		AL
Al-3538.3(4) msβ- → 35Si
β-, n → 34Si		62(2) %
38(2) %		14.14057 MeV
11.6656 MeV		AL
Al-3690(40) msβ- → 36Si
β-, n → 35Si		> 69 %
< 31 %		18.3680 MeV
12.2395 MeV		AL
Al-3710.7(13) msβ- → 37Si
β-, n → 36Si		100 %
?		16.38(21) MeV
14.17(19) MeV		AL
Al-389.0(7) msβ- → 38Si
β-, n → 37Si
β-, 2n → 36Si		?
?
?		20.38(39) MeV
14.71(39) MeV
AL
Al-397.6(16) msβ- → 39Si
β-, n 38Si
β-, 2n 37Si		100 %
?
?		18.33(42) MeV
16.75(41) MeV
AL
Al-40260 nsβ- → 40Si
β-, n 39Si
β-, 2n 38Si		100 %
?
?		22.16(53) MeV
17.20(42) MeV
AL
Al-41> 260 nsβ- → 41Si
β-, n → 40Si		100 %
?		21.30(75) MeV
19.92(61) MeV		AL
Al-42170 nsβ- → 42Si
β-, n → 41Si
β-, 2n → 40Si		?
?
?		23.663(78) MeV
19.91(82) MeV
AL
Al-43170 nsβ- → 43Si
β-, n → 42Si
β-, 2n → 41Si		?
?
?		23.92(10) MeV
22.48(94) MeV
AL

 

Notes (related to the columns):

1 - name of the nuclide, isotope.
2 - E: isotope symbol with mass number (superscript; number of nucleons) and Atomic number (subscript; number of protons).
3 - N: number of neutrons.
4 - relative atomic mass of the Aluminium isotope (isotopic mass including electrons) and the mass of the atomic nucleus in square brackets (nuclear mass, nuclide mass without electrons), each related to 12C = 12.00000 [2]. In addition, the mass excess is given in MeV.
5 - nuclear spin I, unit: h/2π.
6 - source nuclides: Possible, assumed or actual source nuclides (mother nuclides, parent nuclides). If applicable, the corresponding decay modes can be found in the data for the respective starting nuclide.

7 - isotope notation in short form.
8 - decay: half-live of the Aluminium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
9 - decay mode: type of decay into the respective daughter nuclides with n = neutron emission; p = proton emission; α = alpha decay; β- = beta minus decay with electron emission; EC = electron capture; β+ = positron emission; ε = β+ and/or EC; Iso = isomeric transition; CD = cluster decay; SF = spontaneous decay.
10 - decay probability in percent (%).
11 - decay energy; Particle energy related to decay type.
12 - other information and notes: AL = Adopted Levels (link to external data [1]).

Miscellaneous:

()- Numbers in brackets: uncertainty to represent the spread of the reported value.
~ - Theoretical values or systematic trends.
  - unlisted-: Nuclides that have already been mentioned in the literature but for some reason can no longer be found in the current nuclide tables because their discovery e.g. has not confirmed.

 

NMR active Aluminium nuclides

Nuclide
quantity 1)
spin		Nuclear
magnetic
moment
μ/μN		Gyromagnetic ratio
{Quadrupole moment}		Resonant
frequency
v0 bei 1 T		Relative
sensitivity
H0 = const.
v0 = const. 3)
27Al
100 %
5/2+		+3,64070(2)6,976
{+ 0,1466(10)}		11,10310,20689
3,0424

1) Quantity Percentage of natural occurrence.

2) Gyromagnetic ratio: 107 rad T-1 s-1
    Quadrupole moment: Q [barn] = [100 fm2]

3) Related to 1H = 1,000.

 

Radiation Protection

According to the Radiation Protection Ordinance (StrlSchV 2018, Germany), the following values (columns 1 to 7) apply to the handling of Aluminium radionuclides:

NuclideLimit ValueHASS limitSCDaughter NuclidesHalf-life
Al-26105 Bq10 Bq/g0,03 TBq720000 a

(HASS = High-Activity Sealed Radioactive Sources; SC = surface contamination)

 

Literature Sources and References

Properties of the Aluminium nucleides

[1] - NuDat: National Nuclear Data Center, Brookhaven National Laboratory, based on ENSDF and the Nuclear Wallet Cards.

[2] - G. Audi et. al.: The NUBASE evaluation of nuclear and decay properties. Nuclear Physics, (2003), DOI 10.1016/j.nuclphysa.2003.11.001.

[3] - Live Chart of Nuclides. Nuclear structure and decay data.

Aluminium: NMR properties - 27Al-NMR

[4] - N. J. Stone: Table of nuclear magnetic dipole and electric quadrupole moments. Atomic Data and Nuclear Data Tables, (2005), DOI 10.1016/j.adt.2005.04.001.

[5] - Pekka Pyykkö: Year-2008 nuclear quadrupole moments. Molecular Physics, (2008), DOI 10.1080/00268970802018367.

[6] - Pekka Pyykkö: Year-2017 nuclear quadrupole moments. Molecular Physics, (2018), DOI 10.1080/00268976.2018.1426131.

[7] - N. J. Stone: Table of recommended nuclear magnetic dipole moments. IAEA, (2019).

More sources:

[8] - Isotopic abundances, atomic weights and isotopic masses: see respective keyword.

 

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