used to calculate the date the meteorite fell to Earth.

Occurrence in the interstellar medium

The gamma ray emission from the decay of aluminium-26 at 1809 keV was the first observed gamma emission from the Galactic Center. The observation was made by the HEAO-3 satellite in 1984.

²⁶Al is mainly produced in supernovae ejecting many radioactive nuclides in the interstellar medium.

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