aluminum 26

noun

Definition of aluminum 26 

: a heavy radioactive isotope of aluminum of mass number 26 that is found in meteorites The aluminum 26 is thought to originate mostly in supernova explosions, where rapid nuclear reactions build up a wide variety of heavy atomic nuclei.— Neil Gehrels, Scientific American, December 1993

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First Known Use of aluminum 26

1954, in the meaning defined above

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The first known use of aluminum 26 was in 1954

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