![]() ![]() ![]() 40Ar/ 39Ar dating relies on neutron irradiation from a nuclear reactor to convert a stable form of potassium ( 39K) into the radioactive 39Ar. ![]() The older method required splitting samples into two for separate potassium and argon measurements, while the newer method requires only one rock fragment or mineral grain and uses a single measurement of argon isotopes. Argon–argon (or 40Ar/ 39Ar) dating is a radiometric dating method invented to supersede potassium–argon (K/Ar) dating in accuracy.
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