The Argon-40 Method of Radioisotope Dating,which Was Developed to Determine

question 168

Essay

The argon-40 method of radioisotope dating,which was developed to determine the age of moon rocks,assumes that no ⁴⁰Ar gas was trapped when the molten rock solidified and that no ⁴⁰Ar could escape from the solid rock.Potassium-40 decays into argon-40 by positron emission with a half-life of 1.28 10⁹ years.One sample of moon rock showed a ratio of ⁴⁰K to ⁴⁰Ar of 0.100 (N_K/N_Ar = 0.100).How many years ago was this moon rock formed?

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