Uranium-Thorium Dating Accuracy

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PDF 3-6: Uranium Thorium dating
Uranium Thorium Dating
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Uranium-Thorium dating is an absolute dating technique which uses the properties of the radio-active half-life of the two alpha emitters 238U and 230Th . The half-life of 238U is T 1/2=4,470,000,000 y . The half-life of 230Th is comparably short, only T 1/2=75,380 y . When the amounts of uranium and thorium are compared an accurate estimation of the
Uranium-Thorium dating is based on the detection by mass spectrometry of both the parent ( 234 U) and daughter ( 230 Th) products of decay, through the emission of an alpha particle . The decay of Uranium 234 to Thorium 230 is part of the much longer decay series begining in 238 U and ending in 206 Pb . For Uranium-Thorium dating , the initial ratio . . .
Uranium-thorium dating , also called thorium -230 dating , uranium -series disequilibrium dating or uranium -series dating , is a radiometric dating technique established in the 1960s which has been used since the 1970s to determine the age of calcium carbonate materials such as speleothem or coral .
U-Th dates are reported as years before present (y B .P .) . The analytical accuracy and precision for uranium and thorium were assessed by multiple measurements of certified reference material CRM-112A and IRMM-035 respectively during the analysis .
The uranium/thorium dating method gives reliable and relatively precise results in the case of massive speleothems, because the sampling is carried out at the heart of the material where the hypothesis of a closed system (that is, no exchange with the outside environment) is justified in most cases .
With the exception of Carbon-14, radiometric dating is used to date either igneous or metamorphic rocks that contain radioactive elements such as uranium , thorium , argon, etc . And even though various radioactive elements have been used to 'date' such rocks, for the most part, the methods are the same .
One of the (many) assumptions in radiometric dating , and specifically for U-Pb dating , is that most of the three lead (Pb) isotopes we see on earth (206 Pb, 207 Pb and 208 Pb)—which today are produced by radiometric decay of Uranium (U), Thorium (Th), Actinium (Ac) and several other elements with radioactive isotopes—were derived in the past only from radiometric decay of these elements . This is a completely arbitrary and unprovable assumption presupposing a naturalistic evolutionary . . .
Uranium-Thorium dating is a way of determining the age of a rock by the amount of radioactive Thorium it contains . This method can be used to determine the age of calcium carbonate materials, such . . .
A long-standing goal in high-precision and high- accuracy U-Pb zircon geochronology is the total elimination of discordance caused by Pb loss . . . . uranium-thorium methods of dating . The . . .
Of course, any process that tends to concentrate or deplete uranium or thorium relative to lead would have an influence on the radiometric ages computed by uranium -lead or thorium -lead dating . Also, the fact that there are two kids of magma could mean that the various radiometric ages are obtained by mixing of these kinds of magma in different . . .
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Uranium-Thorium Dating Accuracy