In order to investigate the age of a mineral sample believed to be millions of years old, which would be the best choice of radioactive isotope to measure?
A) (59Fe) (t1/2 = 45.1 d)
B) (12C0) (t1/2 = 5.72 ×103 yr)
C) (53Mn) (t1/2 = 3.7 ×106 yr)
D) (40K) (t1/2 = 1.2 ×109 yr)
E) (238U) (t1/2 = 4.51 ×109 yr)
Correct Answer:
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