Half life and radioactive dating
The ratio of the original isotope and its decay product determines how many half-lives have occurred since the sample formed.
Learn about half-life and how it is used in different dating methods, such as uranium-lead dating and radiocarbon dating, in this video lesson. As we age, our hair turns gray, our skin wrinkles and our gait slows.
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.
Radiocarbon dating was invented in the 1940s by Willard F. Radioactive dating is used in research fields, such as anthropology, palaeontology, geology and archeology.
Radiometric dating is used to estimate the age of rocks and other objects based on the fixed decay rate of radioactive isotopes.