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Cosmos » Earth » What is radiometric dating? But how is it dated? What does radiometric dating actually mean? And what methods of dating can be used to date which kinds of items? Radiometric dating is a method of establishing how old something is — perhaps a wooden artefact, a rock, or a fossil — based on the presence of a radioactive isotope within it. The basic logic behind radiometric dating is that if you compare the presence of a radioactive isotope within a sample to its known abundance on Earth, and its known half-life its rate of decay , you can calculate the age of the sample.

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Radiocarbon helps date ancient objects—but it's not perfect

How Accurate is Carbon Dating? Labmate Online

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Over time, carbon decays in predictable ways. And with the help of radiocarbon dating, researchers can use that decay as a kind of clock that allows them to peer into the past and determine absolute dates for everything from wood to food, pollen, poop, and even dead animals and humans. While plants are alive, they take in carbon through photosynthesis. Humans and other animals ingest the carbon through plant-based foods or by eating other animals that eat plants.

About 75 years ago, Williard F. Libby, a Professor of Chemistry at the University of Chicago, predicted that a radioactive isotope of carbon, known as carbon, would be found to occur in nature. Since carbon is fundamental to life, occurring along with hydrogen in all organic compounds, the detection of such an isotope might form the basis for a method to establish the age of ancient materials.