Suppose the half-life of a radioactive isotope is 30,000 years.Of the total amount of that element assimilated by living organisms into their tissues,0.004 percent consists of the radioactive isotope.If you were to find a skeleton of an organism that had 0.0005 percent of the element as the radioactive isotope,it would be estimated to be _______ years old.

Question

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The initial percentage of the radioactive isotope is 0.004%. After one half-life (30,000 years), it would be 0.002%. After two half-lives (60,000 years), it would be 0.001%. After three half-lives (90,000 years), it would be 0.0005%. Therefore, the skeleton is estimated to be 90,000 years old.

Suppose the Half-Life of a Radioactive Isotope Is 30,000 Years