Carbon-13 is a radioactive isotope. About half of a sample decays in 6,000 years. After how long would only 1/8 of the original carbon 13 be left?

Question

Quizplus · Accepted Answer

Carbon-13 is not radioactive, but assuming the question refers to a radioactive isotope with a half-life of 6,000 years, it would take three half-lives (18,000 years) for the sample to reduce to 1/8 of its original amount, as each half-life reduces the sample by half (1/2, 1/4, 1/8).

Carbon-13 Is a Radioactive Isotope