K-A decay

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K-A decay [′kā′ā di‚kā]

(nuclear physics)

Radioactive decay of potassium-40 (⁴⁰K) to argon-40 (⁴⁰A), as the nucleus of potassium captures an orbital electron and then decays to argon-40; the ratio of⁴⁰K to⁴⁰A is used to determine the age of rock (K-A age).

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