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There are several isotopes for Al,... From the last column you get an idea of which are radioactive and their levels of energy. Al24 & 28 are winners.
Isotope
Mass
Half-life
Mode of decay
Nuclear spin
Nuclear magnetic moment
24Al
23.999941
2.07 s
EC + α to 20Ne; EC to 24Mg
4
3.646
25Al
24.990429
7.17 s
EC to 25Mg
5/2
26Al
25.986892
710000 y
EC to 26Mg
5
28Al
27.981910
2.25 m
β- to 28Si
3
3.24
29Al
28.980446
6.5 m
β- to 29Si
5/2
30Al
29.98296
3.68 s
β- to 30Si
3
Isotope
Mass
Half-life
Mode of decay
Nuclear spin
Nuclear magnetic moment
24Al
23.999941
2.07 s
EC + α to 20Ne; EC to 24Mg
4
3.646
25Al
24.990429
7.17 s
EC to 25Mg
5/2
26Al
25.986892
710000 y
EC to 26Mg
5
28Al
27.981910
2.25 m
β- to 28Si
3
3.24
29Al
28.980446
6.5 m
β- to 29Si
5/2
30Al
29.98296
3.68 s
β- to 30Si
3
0
0
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