Argon argon dating accuracy
As we pointed out in these two articles, radiometric dates are based on known rates of radioactivity, a phenomenon that is rooted in fundamental laws of physics and follows simple mathematical formulas.
Dating schemes based on rates of radioactivity have been refined and scrutinized for several decades.
Radiometric dating remains a reliable scientific method.
For articles on the RATE project, see the Rate Index.
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The method was developed by Willard Libby in the late 1940s and soon became a standard tool for archaeologists.
The limit of detectability of the radiogenic Ar portion corresponds to an error of less than 10 a for basalts.The resulting data, in the form of a calibration curve, is now used to convert a given measurement of radiocarbon in a sample into an estimate of the sample's calendar age.Other corrections must be made to account for the proportion of throughout the biosphere (reservoir effects).Here is one example of an isochron, based on measurements of basaltic meteorites (in this case the resulting date is 4.4 billion years) [Basaltic1981, pg. Skeptics of old-earth geology make great hay of these examples.For example, creationist writer Henry Morris [Morris2000, pg.
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A precision of ± 1.5% is obtained for samples older than 10 a, the technique permits the accurate dating of minute amounts of pure separated mineral phases.