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As radioactive isotopes of elements decay, they lose their radio activity and become a brand new element known as a daughter isotope.By measuring the ratio of the amount of the original radioactive element to the daughter isotope, scientists can determine how many half-lives the element has undergone and from there can figure out the absolute age of the sample.Shortly after Becquerel's find, Marie Curie, a French chemist, isolated another highly radioactive element, .The realisation that radioactive materials emit rays indicated a constant change of those materials from one element to another.

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.

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.

Many rocks and organisms contain radioactive isotopes, such as U-235 and C-14.

These radioactive isotopes are unstable, decaying over time at a predictable rate.

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