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Potassium-Argon

K-40 Half Life 1.3 b.y.

K-40 Ca-40 (89%) or Ar-40 (11%)

Ca-40 is the only stable isotope of Calcium

Total decays = 9 x Argon Atoms

Argon is a Noble Gas and Doesn’t React Chemically

Only way to be in a crystal is by decay

Mechanically trapped in lattice

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