Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR

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dc.contributor.author Cheong, C. S.
dc.contributor.author Wintle, Ann G.
dc.contributor.author Choi, J. H.
dc.contributor.author Duller, Geoff A. T.
dc.date.accessioned 2011-05-18T09:34:31Z
dc.date.available 2011-05-18T09:34:31Z
dc.date.issued 2006
dc.identifier.citation Cheong , C S , Wintle , A G , Choi , J H & Duller , G A T 2006 , ' Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR ' Radiation Measurements , pp. 847-854 . en
dc.identifier.issn 1350-4487
dc.identifier.other PURE: 160845
dc.identifier.other dspace: 2160/6772
dc.identifier.uri http://hdl.handle.net/2160/6772
dc.description Choi, J.H., Duller, G.A.T., Wintle, A.G., Cheong, C.S. (2006). Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR. Radiation Measurements, 41: 847-854. Sponsorship: JHC: Korean Government (MOEHRD, Basic Research Promotion Fund, C00265: M01-2004-000-20041-0). GATD: NERC EFCHED grant NER/T/S/2002/00677. en
dc.description.abstract Linearly modulated (LM) optically stimulated luminescence (OSL) measurements have revealed that some sedimentary quartz samples from the Kenyan Rift Valley do not have a fast OSL component, but contain a medium component and several slow components. It was impossible to recover a known dose for these samples using the conventional single-aliquot regenerative-dose (SAR) procedure. The dose-response curves and continuous wave (CW) OSL decay curves for these samples showed several undesirable properties for dating. We have compared various luminescence characteristics of these samples with other quartz samples from elsewhere in the world for which the SAR procedure has been shown to be appropriate; the latter were dominated by a fast OSL component. The characteristics include photoionisation cross-sections for each component and the relative proportions of the different components in the initial and total OSL signals. It was found that those samples that had greater than 90% of the initial 0.8 s of their OSL signal from the fast component were suitable for dating using the conventional SAR protocol. A novel method of displaying the relative contributions of the different OSL components in a ternary diagram is proposed. The thermal stability of each component was investigated using pulse-annealing experiments. We then examined the possibility of applying an LM-OSL SAR protocol to samples that have a substantial medium component. en
dc.format.extent 8 en
dc.language.iso eng
dc.relation.ispartof Radiation Measurements en
dc.title Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1016/j.radmeas.2006.05.003
dc.contributor.institution Institute of Geography & Earth Sciences en
dc.contributor.institution Quaternary Environmental Change Group en
dc.description.status Peer reviewed en


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