In a piece of rock from the Moon, the 87Rb content is
Chapter 28, Problem 28.119(choose chapter or problem)
In a piece of rock from the Moon, the 87Rb content is assayed to be 1.82 1010 atoms per gram of material and the 87Sr content is found to be 1.07 109 atoms per gram. (The relevant decay is 87Rb : 87Sr e. The half-life of the decay is 4.8 1010 yr.) (a) Determine the age of the rock. (b) Could the material in the rock actually be much older? What assumption is implicit in using the radioactive-dating method?
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