Louis, MO O ur solar system formed 4. Primitive meteorites provide samples that were formed in its earliest days and thus can give us information about this period. To establish the sequence of events during solar system formation on a time scale of a million years radioactive isotopes that decay with half-lives comparable to this time scale can potentially serve as clocks for dating these events.
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Aluminium 26 AlAl is a radioactive isotope of the chemical element aluminiumdecaying by either positron emission or electron capture to stable magnesium The half-life of 26 Al is 7. This is far too short for the isotope to survive as a primordial nuclidebut a small amount of it is produced by collisions of atoms with cosmic ray protons. Decay of aluminium also produces gamma rays and x-rays.
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