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All elements have some isotopes that undergo radioactive decay, the question is how fast.

Aluminum comes in three major isotopes, each with their own half-life:

  • Al-26: 730000 years - 0% in natural aluminum
  • Al-27: Stable - 100% in natural aluminum
  • Al-28: 2.3 minutes - 0% in natural aluminum

So as natural aluminum is 100% Al-27 it does not undergo radioactive decay

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