Solved: In a piece of rock from the Moon, the 87Rb content

Chapter 29, Problem 29.1

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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 halflife 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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