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Dating fossils with the use of radioactivity

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. Scientists calculate ages by measuring how much of the isotope remains in the substance. The key to an age of a substance is the decay-product ratio.
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DK Science: Dating Fossils

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How Is Radioactive Dating Used to Determine the Age of an Object? | realpadelclub.com

Many rocks and organisms contain radioactive isotopes, such as U and C These radioactive isotopes are unstable, decaying over time at a predictable rate. As the isotopes decay, they give off particles from their nucleus and become a different isotope. The parent isotope is the original unstable isotope, and daughter isotopes are the stable product of the decay.
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How Do Scientists Date Ancient Things?

Geologists use radiometric dating to estimate how long ago rocks formed, and to infer the ages of fossils contained within those rocks. Radioactive elements decay The universe is full of naturally occurring radioactive elements. Radioactive atoms are inherently unstable; over time, radioactive "parent atoms" decay into stable "daughter atoms.
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There are many uses of radioactive isotopes. Two of the most common include carbon dating to discover how old fossils and other historical organic including carbon artifacts are and uses of radioactive isotopes in medicine. Radioactive isotopes in medicine are used to help diagnose certain disease states and isolate regions in the body. Their half life.
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