Quartz Single Grain Osl Sensitivity Distributions: Implications for Multiple Grain Single Aliquot Dating
A simple probabilistic numerical model was used to construct synthetic De distributions by combining the simulated OSL from grains of different sensitivities and with various simulated De values. This is useful for exploring the complex patterns generated by summing the signals from many grains in real, multiple grain OSL dating scenarios, and demonstrates that the form of the sensitivity distribution has a significant effect on the identification of mixed dose populations in multiple grain single aliquot methods. I describe the simple numerical model and its implementation. I present measured quartz single grain OSL sensitivity distributions for an aeolian dune sample from the Simpson Desert, Northern Territory, Australia, and from a suite of 9 fluvial sediments from Namadgi National Park, Australian Capital Territory, Australia, to illustrate effects that result from natural differences. Minimum age model determinations of synthetic De values are used to assess the validity of dose values estimated from multiple grain single aliquot measurements.
If the inline PDF is not rendering correctly, you can download the PDF file here.
Adamiec G 2000a. Variations in luminescence properties of single quartz grains and their consequences for equivalent dose estimation. Radiation Measurements 32: 427-432.
Adamiec G 2000b. Aspects of pre-dose and other luminescence phenomena in quartz absorbed dose estimation. Unpublished DPhil thesis University of Oxford: 200pp.
Aitken MJ 1998. Introduction to optical dating. Oxford University Press Oxford 267pp.
Bøtter-Jensen L Bulur E Duller GAT and Murray AS 2000. Advances in luminescence instrument systems. Radiation Measurements 32: 523-528.
Duller GAT Bøtter-Jensen L Murray AS and Truscutt AJ 1999. Single grain laser luminescence (SGLL) measurements using a novel automated reader. Nuclear Instruments and Methods in Physical Research Section B 155: 506-514.
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 I. Experimental design and statistical models. Archaeometry 41: 339-364.
Murray AS and Funder S 2003. Optically stimulated luminescence dating of a Danish Eemian coastal marine deposit: a test of accuracy. Quaternary Science Reviews 22: 1177-1183.
Murray AS and Roberts RG 1998. Measurement of the equivalent dose in quartz using a regenerative-dose single-aliquot protocol. Radiation Measurements 29: 503-515.
Murray AS and Wintle AG 2000. Luminescence dating of quartz using an improved single-aliquot regenerative-dose protocol. Radiation Measurements 32: 57-73.
Murray AS and Wintle AG 2002. Retrospective dose assessment: the measurement of the dose in quartz in dating and accident dosimetry. Radiation Protection Dosimetry 101: 301-308.
Murray AS and Wintle AG 2003. The single aliquot regenerative dose protocol: potential for improvements in reliability. Radiation Measurements 37: 377-381.
Olley JM Caitcheon GC and Murray AS 1998. The distribution of apparent dose as determined by optically stimulated luminscence in small aliquots of fluvial quartz: implications for dating young sediments. Quaternary Science Reviews (Quaternary Geochronology) 17: 1033-1040.
Rhodes EJ 1990. The optical dating of quartz from sediments. Unpublished DPhil thesis University of Oxford: 153 pp.
Rhodes EJ Bronk-Ramsey C Outram Z Batt C Willis L Dockrill S and Bond J 2003. Bayesian methods applied to the interpretation of multiple OSL dates: high precision sediment age estimates from Old Scatness Broch excavations Shetland Isles. Quaternary Science Reviews 22: 1231-1244.
Rhodes EJ and Pownall L 1994. Zeroing of the OSL signal in quartz from young glaciofluvial sediments. Radiation Measurements 23: 329-333.
Smith BW Rhodes EJ Stokes S Spooner NA and Aitken MJ 1990. Optical dating of sediments: initial results from Oxford. Archaeometry 32: 19-31.
Tijms H 2004. Understanding Probability: Chance Rules in Everyday Life. Cambridge University Press Cambridge: 378pp.
Wallinga J 2002. On the detection of OSL age overestimation using single-aliquot techniques. Geochronometria21: 17-26.