1. bookVolume 38 (2011): Issue 4 (December 2011)
Journal Details
License
Format
Journal
eISSN
1897-1695
First Published
04 Jul 2007
Publication timeframe
1 time per year
Languages
English
access type Open Access

Expectations of scatter in equivalent-dose distributions when using multi-grain aliquots for OSL dating

Published Online: 22 Sep 2011
Volume & Issue: Volume 38 (2011) - Issue 4 (December 2011)
Page range: 424 - 431
Journal Details
License
Format
Journal
eISSN
1897-1695
First Published
04 Jul 2007
Publication timeframe
1 time per year
Languages
English
Abstract

In the OSL dating of sediment, the scatter in equivalent dose (D e) between grains is almost always larger than would be expected due to counting statistics alone. Some scatter may be caused by insufficient (partial) bleaching of some of the grains prior to deposition. In order to date partially bleached sediment, it is essential to estimate the amount of scatter caused by other processes (e.g. grain-to-grain variability in the natural dose rate). Measurements of such scatter are performed at the single-grain level; by contrast, most OSL dating is performed on multi-grain subsamples, for which grain-to-grain scatter is reduced through averaging.

Here we provide a model for estimating the expected scatter (i.e. excluding that caused by partial bleaching) for multi-grain aliquots. The model requires as input the single-grain sensitivity distribution, the number of grains in the sub-samples, and the expected scatter at the single-grain level, all of which can be estimated to an adequate degree. The model compares well with measured values of scatter in D e, determined using aliquots of various sizes, and can be used to help produce a minimum-age D e from multi-grain subsamples that is consistent with single-grain data.

Keywords

[1] Adamiec G, 2000. Variations in luminescence properties of single quartz grains and their consequences for equivalent dose estimation. Radiation Measurements 32(5–6):427–432, DOI 10.1016/S1350-4487(00)00043-3. http://dx.doi.org/10.1016/S1350-4487(00)00043-310.1016/S1350-4487(00)00043-3Search in Google Scholar

[2] Arnold LJ and Roberts RG, 2009. Stochastic modelling of multi-grain equivalent dose (De) distributions: Implications for OSL dating of sediment mixtures. Quaternary Geochronology 4(3): 204–230, DOI 10.1016/j.quageo.2008.12.001. http://dx.doi.org/10.1016/j.quageo.2008.12.00110.1016/j.quageo.2008.12.001Search in Google Scholar

[3] Ballarini M, 2006. Optical dating of quartz from young deposits. PhD thesis, Delft University of Technology Search in Google Scholar

[4] Ballarini M, Wallinga J, Duller GAT, Brower JC, Bos AJJ and van Eijk CWE, 2005. Optimuzing detection filters for single grain optical dating of quartz. Radiation Measurements 40(1): 5–12, DOI 10.1016/j.radmeas.2005.03.006. http://dx.doi.org/10.1016/j.radmeas.2005.03.00610.1016/j.radmeas.2005.03.006Search in Google Scholar

[5] Ballarini M, Wintle AG and Wallinga J, 2006. Spatial variation of dose rate from beta sources using single grains. Ancient TL 24(1):1–8. Search in Google Scholar

[6] Bos AJJ, Wallinga J, Johns C, Abellon RD, Brouwer JC, Schaart DR and Murray AS, 2006. Accurate calibration of a laboratory beta particle dose rate for dating purposes. Radiation Measurements 41(7–8): 1020–1025, DOI 10.1016/j.radmeas.2006.04.003. http://dx.doi.org/10.1016/j.radmeas.2006.04.00310.1016/j.radmeas.2006.04.003Search in Google Scholar

[7] Bøtter-Jensen L, Bulur E, Duller GAT and Murray AS, 2000. Advances in luminescence instrument systems. Radiation Measurements 32(1): 57–73, DOI 10.1016/S1350-4487(99)00253-X. http://dx.doi.org/10.1016/S1350-4487(99)00253-X10.1016/S1350-4487(99)00253-XSearch in Google Scholar

[8] Cunningham AC and Wallinga J, 2010. Selection of integration time-intervals for quartz OSL decay curves. Quaternary Geochronology 5(6): 657–666, DOI 10.1016/j.quageo.2010.08.004. http://dx.doi.org/10.1016/j.quageo.2010.08.00410.1016/j.quageo.2010.08.004Search in Google Scholar

[9] Duller GAT, 2008. Single-grain optical dating of Quaternary sediments: why aliquot size matters in luminescence dating. Boreas 37(4): 589–612, DOI 10.1111/j.1502-3885.2008.00051.x. http://dx.doi.org/10.1111/j.1502-3885.2008.00051.x10.1111/j.1502-3885.2008.00051.xSearch in Google Scholar

[10] Duller GAT, Bøtter-Jensen L and Murray AS, 2000. Optical dating of single sand-sized grains of quartz: sources of variability. Radiation Measurements 32(5–6): 453–457, DOI 10.1016/S1350-4487(00)00055-X. http://dx.doi.org/10.1016/S1350-4487(00)00055-X10.1016/S1350-4487(00)00055-XSearch in Google Scholar

[11] Galassi M, Davies J, Theiler J, Gough B, Jungman G, Alken P, Booth M and Rossi F, 2009. GNU Scientific Library Reference Manual. Network Theory Ltd. Search in Google Scholar

[12] Galbraith RF, Roberts RG, Laslett GM, Yoshida H and Olley JM, 1999. Optical dating of single and multiple grains of quartz from jinmium rock shelter, northern Australia, part 1, Experimental design and statistical models. Archaeometry 41(2): 339–364, DOI 10.1111/j.1475-4754.1999.tb00987.x. http://dx.doi.org/10.1111/j.1475-4754.1999.tb00987.x10.1111/j.1475-4754.1999.tb00987.xSearch in Google Scholar

[13] Jacobs Z, Wintle AG, Roberts RG and Duller GAT, 2008. Equivalent dose distributions from single grains of quartz at Sibudu, South Africa: context, causes and consequences for optical dating of archaeological deposits. Journal of Archaeological Science 35(7): 1808–1820, DOI 10.1016/j.jas.2007.11.027. http://dx.doi.org/10.1016/j.jas.2007.11.02710.1016/j.jas.2007.11.027Search in Google Scholar

[14] Mayya YS, Morthekai P, Murari MK and Singhvi AK, 2006. Towards quantifying beta microdosimetric effects in single-grain quartz dose distribution. Radiation Measurements 41(7–8): 1032–1039, DOI 10.1016/j.radmeas.2006.08.004. http://dx.doi.org/10.1016/j.radmeas.2006.08.00410.1016/j.radmeas.2006.08.004Search in Google Scholar

[15] Murray AS and Wintle AG, 2000. Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol. Radiation Measurements 32(1): 57–73, DOI 10.1016/S1350-4487(99)00253-X. http://dx.doi.org/10.1016/S1350-4487(99)00253-X10.1016/S1350-4487(99)00253-XSearch in Google Scholar

[16] Murray AS and Wintle AG, 2003. The single aliquot regenerative dose protocol: potential for improvements in reliability. Radiation Measurements 37(4–5): 377–381, DOI 10.1016/S1350-4487(03)00053-2. http://dx.doi.org/10.1016/S1350-4487(03)00053-210.1016/S1350-4487(03)00053-2Search in Google Scholar

[17] Nathan RP, Thomas PJ, Jain M, Murray AS and Rhodes EJ, 2003. Environmental dose rate heterogeneityof beta radiation and its implications for luminescence dating: Monte Carlo modeling and experimental validation. Radiation Measurements 37(4–5): 305–313, DOI 10.1016/S1350-4487(03)00008-8. http://dx.doi.org/10.1016/S1350-4487(03)00008-810.1016/S1350-4487(03)00008-8Search in Google Scholar

[18] Roberts RG, Galbraith RF, Olley JM, Yoshida H and Laslett GM, 1999. Optical dating of single and multiple grains of quartz from Jinmium rock shelter, northern Australia: part II, results and implications. Archaeometry 41(2): 365–395, DOI 10.1111/j.1475-4754.1999.tb00988.x. http://dx.doi.org/10.1111/j.1475-4754.1999.tb00988.x10.1111/j.1475-4754.1999.tb00988.xSearch in Google Scholar

[19] Roberts RG, Galbraith RF, Yoshida H, Laslett GM and Olley JM, 2000. Distinguishing dose populations in sediment mixtures: a test of single-grain optical dating procedures using mixturesof laboratory-dosed quartz. Radiation Measurements 32(5–6): 459–465, DOI 10.1016/S1350-4487(00)00104-9. http://dx.doi.org/10.1016/S1350-4487(00)00104-910.1016/S1350-4487(00)00104-9Search in Google Scholar

[20] Thomsen KJ, Murray AS and Bøtter-Jensen L, 2005. Sources of variability in OSL dose measurements using single grains of quartz. Radiation Measurements 39(1): 47–61, DOI 10.1016/j.radmeas.2004.01.039. 10.1016/j.radmeas.2004.01.039Search in Google Scholar

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