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Radioactive isotopes used in dating fossils Interracial site sex

Radioactive dating uses the decay rates of radioactive substances to measure absolute ages of rocks, minerals and carbon-based substances, according to How Stuff Works.

Scientists know how quickly radioactive isotopes decay into other elements over thousands, millions and even billions of years.

The radiocarbon dating method is based on the fact that radiocarbon is constantly being created in the atmosphere by the interaction of cosmic rays with atmospheric nitrogen.The ratio of the original isotope and its decay product determines how many half-lives have occurred since the sample formed.A half-life measures the time it takes for one half of a radio isotope's atoms to break down into another element.For biological objects older than 50,000 years, scientists use radioactive dating to determine the age of rocks surrounding where the material was found.By dating rocks, scientists can approximate ages of very old fossils, bones and teeth.For instance, if an object has 50 percent of its decay product, it has been through one half-life.A popular way to determine the ages of biological substances no more than 50,000 years old is to measure the decay of carbon-14 into nitrogen-14.The fossil record may be incomplete and may never fully completed, but there are still many clues to evolution and how it happens within the fossil record.One way that helps scientists place fossils into the correct era on the Geologic Time Scale is by using radiometric dating.Different isotopes have different half-lives and sometimes more than one present isotope can be used to get an even more specific age of a fossil.Below is a chart of commonly used radiometric isotopes, their half-lives, and the daughter isotopes they decay into.

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