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Smedley, RK and Pearce, NJG (2016) Internal U, Th and Rb concentrations of alkali-feldspar grains: Implications for luminescence dating. Quaternary Science Reviews, 35. 16 -25. ISSN 0277-3791
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Abstract
This study assesses whether internal U, Th and Rb concentrations of single grains of alkali-feldspar can impact upon luminescence dating. Internal alpha dose-rates determined for two sedimentary samples calculated from mean U and Th concentrations accounted for ∼10% of the total dose-rates, while internal beta dose-rates from mean Rb concentrations accounted for ∼2%. Depth profiles of measurements penetrating into each grain show that internal U and Th concentrations varied between grains, where some grains had effective internal alpha dose-rates up to 1.8 Gy/ka (32% of the total dose-rate). K concentrations inferred from Rb (KRb) for individual grains suggest that internal U and Th concentrations are related to the feldspar composition. Grains with KRb > 6% had low U and Th, and grains with KRb < 6% had higher U and Th concentrations. Internal alpha and beta dose-rates of the perthitic and Na-rich grains contaminating the density-separated K-feldspar fractions had a significant impact upon the single-grain De distributions, which was estimated to be equivalent to overdispersion values of ∼10 – 15%. The scatter in the De distributions arising from internal alpha and beta dose-rates for both samples could be reduced by selecting only the brightest 20% of grains for luminescence dating.
Item Type: | Article |
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Uncontrolled Keywords: | Luminescence dating, Alkali-feldspar, Internal dose-rate, Uranium, Thorium, Rubidium, |
Subjects: | G Geography. Anthropology. Recreation > GB Physical geography |
Divisions: | Faculty of Natural Sciences > School of Geography, Geology and the Environment |
Depositing User: | Symplectic |
Date Deposited: | 02 Mar 2017 12:21 |
Last Modified: | 31 Mar 2021 08:21 |
URI: | https://eprints.keele.ac.uk/id/eprint/2907 |