Which of the following naturally occurring radioisotopes would be most useful in dating objects thought to be?
A. carbon-14; t = 5.73 103 years.
B. potassium-40; t = 1.28 109 years.
C. thorium-234; t = 25 days
D. radon-222; t = 3.8 days
Filed under: Potassium Diet
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Thought to be what?
Carbon-14 is better for dating organic matter, potassium-40 is better at dating things like rocks.