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This number is attained by simply adding the number of parent and daughter atoms currently in the sample because each daughter atom was once a parent atom. After three half-lives, what percentage of the original radioactive parent isotope will remain in a sample? Suppose you analyzed a mineral sample and found that it contained 33, parent atoms and 14, daughter atoms. Up Next We have learned about some techniques involving absolute dating, but how do archaeologists use relative dating? If a geologist claims to be younger than his or her co-worker, that is a relative age. As noted above, a radiometric date tells us when a system became closed, for example when a mineral containing radioactive parent elements first crystalized. Scientists can use certain types of fossils referred to as index fossils to assist in relative dating via correlation.

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