Lead—lead dating is a method for dating geological samples, normally based on 'whole-rock' samples of material such as granite. For most dating requirements it has been superseded by uranium—lead dating U—Pb dating , but in certain specialized situations such as dating meteorites and the age of the Earth it is more important than U—Pb dating. There are three stable "daughter" Pb isotopes that result from the radioactive decay of uranium and thorium in nature; they are Pb, Pb, and Pb. These daughter isotopes are the final decay products of U and Th radioactive decay chains beginning from U, U and Th respectively. With the progress of time, the final decay product accumulates as the parent isotope decays at a constant rate.
Validation of the lead-210 dating method
Lead–lead dating - Wikipedia
Edwin A. The presence of radon gas as a member of the uranium-decay scheme provides a unique method for creating disequilibrium. The gas radon Rn escapes from the ground and decays rapidly in the atmosphere to lead Pb , which falls quickly to the surface where it is incorporated in glacial ice and sedimentary materials. By assuming that the present deposition rate also prevailed in the past, the age of a given sample at depth can be estimated…. Take a minute to check out all the enhancements! Choose a language from the menu above to view a computer-translated version of this page. Please note: Text within images is not translated, some features may not work properly after translation, and the translation may not accurately convey the intended meaning.
The Pb method is used to determine the accumulation rate of sediments in lakes, oceans and other water bodies. In a typical application, the average accumulation rate over a period of - years is obtained. From the accumulation rate, the age of sediment from a particular depth in the sediment column can be estimated. Pb is a naturally occurring radioactive element that is part of the uranium radioactive decay series.
Federal government websites often end in. Before sharing sensitive information, make sure you're on a federal government site. The site is secure.