radiometric dating
Chemistry
Physics
Examples of radiometric dating in the following topics:

Dating Using Radioactive Decay
 Radiometric dating is used to date materials using the decay rate of a radioactive isotope.
 Radiometric dating, often called radioactive dating, is a technique used to determine the age of materials such as rocks.
 The bestknown radiometric dating techniques include radiocarbon dating, potassiumargon dating, and uraniumlead dating.
 The different methods of radiometric dating are accurate over different timescales, and they are useful for different materials.
 In these cases, the halflife of interest in radiometric dating is usually the longest one in the chain.

HalfLife and Rate of Decay; Carbon14 Dating
 Carbon14 dating is a radiometric dating method that uses the radioisotope carbon14 (14C) to estimate the age of object.
 Radiocarbon dating (usually referred to simply as carbon14 dating) is a radiometric dating method.
 Such raw ages can be calibrated to give calendar dates.
 He demonstrated the accuracy of radiocarbon dating by accurately estimating the age of wood from a series of samples for which the age was known, including an ancient Egyptian royal barge dating from 1850 BCE.
 Identify the age of materials that can be approximately determined using radiocarbon dating

Carbon Dating and Estimating Fossil Age
 Paleontologists rely on stratigraphy to date fossils.
 Together with stratigraphic principles, radiometric dating methods are used in geochronology to establish the geological time scale.
 Beds that preserve fossils typically lack the radioactive elements needed for radiometric dating ("radiocarbon dating" or simply "carbon dating").
 Radioactive elements are common only in rocks with a volcanic origin, so the only fossilbearing rocks that can be dated radiometrically are volcanic ash layers.
 Radiometric dating is a technique used to date materials such as rocks or carbon, usually based on a comparison between the observed abundance of a naturally occurring radioactive isotope and its decay products, using known decay rates.

Isotopes
 Because the halflife of 14C is long, it is used to date formerlyliving objects such as old bones or wood.
 This technique is called radiocarbon dating, or carbon dating for short.
 Scientists often use these other radioactive elements to date objects that are older than 50,000 years (the limit of carbon dating).
 Through the use of radiometric dating, scientists can study the age of fossils or other remains of extinct organisms.
 Discuss the properties of isotopes and their use in radiometric dating

Properties of Carbon
 It is used in radiometric dating to determine the age of carbonaceous samples (of physical or biological origin) up to about 60,000 years old.

The Fossil Record as Evidence for Evolution
 The development of radiometric dating techniques in the early 20th century allowed geologists to determine the numerical or "absolute" age of various strata and their included fossils.

The Origins of Archaea and Bacteria
 This estimate is based on evidence from radiometric dating of meteorite material together with other substrate material from earth and the moon.
 Although probable prokaryotic cell fossils date to almost 3.5 billion years ago, most prokaryotes do not have distinctive morphologies; fossil shapes cannot be used to identify them as Archaea.
 Some publications suggest that archaean or eukaryotic lipid remains are present in shales dating from 2.7 billion years ago.

Maturity Date
 Maturity date refers to the final payment date of a loan or other financial instrument.
 In finance, maturity date or redemption date, refers to the final payment date of a loan or other financial instrument, at which point the principal (and all remaining interest) is due to be paid.
 The issuer has to repay the nominal amount on the maturity date.
 In this case, the maturity date is the day when the bond is called.
 Similarly, the maturity date, if applicable, is the date as the bond is redeemed.

Dividends Payable
 On the dividend declaration date, a company's board of directors announces its intention to pay a dividend to shareholders on record as of a certain date (date of record).
 On the declaration date, the Board announces the date of record and a payment date; the payment date is the date when the funds are sent to the shareholders and the dividends payable account is reduced for the payment amount.

Call Provisions
 A callable bond allows the issuer to redeem the bond before the maturity date; this is likely to happen when interest rates go down.
 Call dates are the dates on which callable bonds can be redeemed early.
 A Bermudan callable has several call dates, usually coinciding with coupon dates.
 A European callable has only one call date.
 An American callable can be called at any time until the maturity date.