D-e determination for young samples using the standardised OSL response of coarse-grain quartz

Christopher Ian Burbidge, Geoff A. T. Duller, H. M. Roberts

Research output: Contribution to journalArticlepeer-review

Abstract

It has recently been shown that it is possible to construct standardised curves of the sensitivity corrected growth in optically stimulated luminescence (OSL) with exposure to ionising radiation, and that they may be used in the dating of quartz and polymineral samples. Standardised growth curves are particularly advantageous where measurement time is limited, as once they have been defined, only the natural signal and the response to a subsequent test dose are required in order to determine the equivalent dose of a sub-sample. The present study is concerned with the application of the standardised growth curve approach to OSL dating of Holocene age samples. Systematic changes in the shape of the standardised growth curve of coarse-grain quartz are identified as the size of the test dose is varied, because of non-proportionality between the test dose and the luminescence test response. The effect is characterised by fitting the change in gradient of the standardised growth curve as test dose is varied. An equation is defined to describe standardised growth as a function of regenerative dose and test dose. Regenerative dose responses of other samples in this study are treated as unknowns and recovered through different growth curves to compare precision and accuracy of various methods of De determination. The standardised growth curve is found to yield similar precision to conventional fits of single aliquot regenerative data, but slightly poorer accuracy. The standardised growth curve approach was refined by incorporating the measurement of one regenerative response for each aliquot as well as its natural signal. Measurements of this additional data point for aliquots of 22 samples were used to adjust the standardised growth equation, improving its accuracy. The incorporation of this additional data point also indicated a systematic uncertainty of 2.4% in the estimates of De.
Original languageEnglish
Pages (from-to)278-288
Number of pages11
JournalRadiation Measurements
Volume41
Issue number3
Early online date19 Oct 2005
DOIs
Publication statusPublished - 01 Mar 2006

Keywords

  • standardised growth curve
  • quartz
  • optically stimulated luminescence
  • late holocene
  • Old Scatness
  • Sumburgh Hotel Gardins
  • Shetland

Fingerprint

Dive into the research topics of 'D-e determination for young samples using the standardised OSL response of coarse-grain quartz'. Together they form a unique fingerprint.

Cite this