Uploaded January 2025 | Updated September 2026, 2 weeks ago

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@randomstuff8828
Aluminium or aluminum (13Al) has 23 known isotopes from 21Al to 43Al and 4 known isomers. Only 27Al (stable isotope) and 26Al (radioactive isotope, t_(1/2) = 720 kyr) occur naturally, however 27Al comprises nearly all natural aluminium. Other than 26Al, all radioisotopes have half-lives under 7 minutes, most under a second. The standard atomic weight is 26.9815385(7). 26Al is produced from argon in the atmosphere by spallation caused by cosmic-ray protons. Aluminium isotopes have found practical application in dating marine sediments, manganese nodules, glacial ice, quartz in rock exposures, and meteorites. The ratio of 26Al to 10Be has been used to study the role of sediment transport, deposition, and storage, as well as burial times, and erosion, on 10^5 to 10^6 year time scales. 26Al has also played a significant role in the study of meteorites.
The working frequency is 1,121,015,393,207,859.16 Hz.
en.wikipedia.org/wiki/Isotopes_of_aluminium

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