While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. - Power Point PPT Presentation An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Radioactivity was first discovered by Henri Becquerel in 1896 and Polish-French chemist Marie Curie discovered that radioactivity produced new elements ( radioactive decay ).

Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.

Among the best-known techniques are radiocarbon dating, potassium-argon dating and uranium-lead dating.

By allowing the establishment of geological timescales, it provides a significant source of information about the ages of fossils and the deduced rates of evolutionary change.

Radiometric dating is also used to date archaeological materials, including ancient artifacts.

There are three different decay mechanisms: “Parent” “Daughter” M&W4 Fig. 17.18 C14 is an isotope of carbon that forms from Nitrogen in the atmosphere. Once dead, no new carbon is absorbed, and C14 turns back into Nitrogen. This method works best for fossils younger than 50,000 years.

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 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.

and is now the principal source of information about the absolute age of rocks and other geological features, including the age of the Earth itself, and can be used to date a wide range of natural and man-made materials.

Different methods of radiometric dating vary in the timescale over which they are accurate and the materials to which they can be applied.