Which radioactive isotope is used in geological dating

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Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.It is based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.Each chapter will include a few questions designed to test your knowledge of material covered in the chapter and in the Internet-based resources.

The rates of decay of various radioactive isotopes have been accurately measured in the laboratory and have been shown to be constant, even in extreme temperatures and pressures.Obviously, this works only for things which were once living.Scientists determined the Earth's age using a technique called radiometric dating.Radiometric dating--the process of determining the age of rocks from the decay of their radioactive elements--has been in widespread use for over half a century.There are over forty such techniques, each using a different radioactive element or a different way of measuring them.

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