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Isotopes of Aluminium

List, data and properties of all known isotopes of Aluminium as well as radioactive decay products and intermediate products.

 

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

 

Atomic Properties

Isotope
Nuclide
ZANNameAtomic Mass
[Nuclear Mass]
{Mass Excess}
Spin I
(h/2π)
μParent
123456789
21Al13218Aluminium-2121.02897(64) u
[21.0218385 u]
{26.98538 MeV}
(5/2+)
22Al13229Aluminium-2222.01954(43) u
[22.0124085 u]
{18.20139 MeV}
(4)+22Si
23Al132310Aluminium-2323.0072444(4) u
[23.0001129 u]
{6.74812 MeV}
5/2++3.89(2)23Si
24Al132411Aluminium-2423.99994754(25) u
[23.9928161 u]
{-0.04887 MeV}
4+24Si
24mAl132411Aluminium-24m23.99994754(25) u
[23.9928161 u]
{-0.04887 MeV}
1+2.99(9)
25Al132512Aluminium-2524.99042831(7) u
[24.9832968 u]
{-8.91597 MeV}
5/2+3.6447(12)25Si
26P
27S
26Al132613Aluminium-2625.98689186(7) u
[25.9797604 u]
{-12.21015 MeV}
5++2.803(4)26Si
27P
26mAl132613Aluminium-26m25.98689186(7) u
[25.9797604 u]
{-12.21015 MeV}
0+
27Al132714Aluminium-2726.9815385(7) u
[26.974407 u]
{-17.19678 MeV}
5/2++3.64070(2)27Mg
27Si
28P
28Al132815Aluminium-2827.98191009(8) u
[27.9747786 u]
{-16.85064 MeV}
3+3.241(5)28Mg
29Al132916Aluminium-2928.9804532(4) u
[28.9733217 u]
{-18.20773 MeV}
5/2+29Mg
30Al133017Aluminium-3029.982968(3) u
[29.9758365 u]
{-15.86521 MeV}
3+3.010(7)30Mg
31Al133118Aluminium-3130.9839498(24) u
[30.9768183 u]
{-14.95066 MeV}
5/2(+)+3.832(5)31Mg
32Al133219Aluminium-3231.988084(8) u
[31.9809525 u]
{-11.09968 MeV}
1+1.953(2)32Mg
33Mg
32mAl133219Aluminium-32m31.988084(8) u
[31.9809525 u]
{-11.09968 MeV}
(4+)
33Al133320Aluminium-3332.990878(8) u
[32.9837465 u]
{-8.49709 MeV}
(5/2)+4.090(5)33Mg
34Mg
34Al133421Aluminium-3433.996779(3) u
[33.9896475 u]
{-3.00034 MeV}
(4-)+ 2.157(6)34Mg
35Al133522Aluminium-3534.999760(8) u
[34.9926285 u]
{-0.22356 MeV}
(5/2+)
36Al133623Aluminium-3636.00639(16) u
[35.9992585 u]
{5.95225 MeV}
37Al133724Aluminium-3737.01053(19) u
[37.0033985 u]
{9.80863 MeV}
5/2+
38Al133825Aluminium-3838.0174(4) u
[38.0102685 u]
{16.208 MeV}
(0-)
39Al133926Aluminium-3939.02217(43) u
[39.0150385 u]
{20.65122 MeV}
(5/2+)
40Al134027Aluminium-4040.02962(43) u
[40.0224885 u]
{27.59085 MeV}
41Al134128Aluminium-4141.03588(54) u
[41.0287485 u]
{33.422 MeV}
5/2+
42Al134229Aluminium-4242.04305(64) u
[42.0359185 u]
{40.10082 MeV}
43Al134330Aluminium-4343.05048(86) u
[43.0433485 u]
{47.02182 MeV}

 

Radioactive Decay Properties

IsotopeRadioactive DecayAEExtern
Half-lifeDecay ModeProbabilityEnergy
1101112131415
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
425.8(1) keVAL
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 MeV228.305(13) keVAL
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 %956.6(5) keVAL
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 - nuclide, isotope symbol.
2 - Z = number of protons (atomic number).
3 - Mass number A.
4 - N = number of neutrons.
5 - Identification of the Aluminium isotope.
6 - 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.
7 - Nuclear spin I, unit: h/2π.
8 - Nuclear magnetic moment μmag.
9 - 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.
10 - Decay: Half-live of the Aluminium isotope (a = years; ; d = days; h = hours; min = minutes; s = seconds).
11 - Decay: 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.
12 - Decay percentage in percent (%).
13 - Decay energy; Particle energy related to decay type.
14 - AE = Excitation energy for metastable nuclei.
15 - 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
107 rad T-1 s-1
Quadrupole
moment
Q fm-2
Resonant
frequency
v0 bei 1 T
Relative
sensitivity
H0 = const.
v0 = const. 2)
27Al
100 %
5/2+
+3,64070(2)6,976+ 14,66(10)11,10310,20689
3,0424

1) Quantity Percentage of natural occurrence.

2) 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.

 


Category: Isotopes

Last update: 05.07.2020



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