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    Radiometric age dating for kids

    A child mummy is found high in the Andes and the archaeologist says the child lived more than 7,555 years ago.

    How do scientists know how old an object or human remains are?

    ­You probably have seen or read news stories about fascinating ancient artifacts.

    At an ar­chaeological dig, a piece of wooden tool is unearthed and the archaeologist finds it to be 5,555 years old.

    This works because elements have a life cycle known as a “half-life.” A half-life refers to the amount of time it takes for an isotope to lose half of its atoms as a result of decaying.

    When an isotope decays, it often becomes a different kind of element altogether.

    Radiometric dating is often used to determine the age of rocks, bones, and ancient artifacts.All ordinary matter is made up of combinations of chemical elements, each with its own atomic number, indicating the number of protons in the atomic nucleus.Additionally, elements may exist in different isotopes, with each isotope of an element differing in the number of neutrons in the nucleus.Radiometric dating or radioactive dating is a technique used to date materials such as rocks or carbon, in which trace radioactive impurities were selectively incorporated when they were formed.The method compares the abundance of a naturally occurring radioactive isotope within the material to the abundance of its decay products, which form at a known constant rate of decay.

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