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There's a small amount of radioactive carbon-14 in all living organisms.

When they die no new carbon-14 is taken in by the dead organism.

Scientists look at half-life decay rates of radioactive isotopes to estimate when a particular atom might decay.

A useful application of half-lives is radioactive dating.

So let’s take a closer look and see how reliable this dating method really is.

Each chemical element, such as carbon and oxygen, consists of atoms.

Orbiting around the nucleus are electrons (tiny particles each with a single negative electric charge).

Yet few people know how radiometric dating works or bother to ask what assumptions drive the conclusions.The results showed that Ötzi died over 5000 years ago, sometime between 33 BC. Uranium has a very long half-life and so by measuring how much uranium is left in a rock its approximate age can be worked out. As a member, you'll also get unlimited access to over 55,000 lessons in math, English, science, history, and more.Geological Time | Geologic Time Scale | Plate Tectonics | Radiometric Dating | Deep Time | Geological History of New Zealand | Radiometric Dating Radiometric measurements of time Since the early twentieth century scientists have found ways to accurately measure geological time.The discovery of by the French physicist, Henri Becquerel, in 1896 paved the way of measuring absolute time.

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