Luminescence sensitivity changes of polymineral fine grains during IRSL and [post-IR] OSL measurements

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Abstract

Sensitivity changes during measurement sequences of infra-red-stimulated luminescence (IRSL) and post-IR optically stimulated luminescence (OSL) are presented for a sample of loess from northwestern China. Together with a dose recovery experiment, the results are used to investigate the ratio of 2.4 found for the D e values (for IRSL and [post-IR] OSL) obtained when using a single-aliquot regenerative-dose (SAR) protocol in which both D e values are obtained in a single sequence of measurements. Responses to test doses for both the IRSL and [post-IR] OSL show progressive luminescence sensitivity changes with repeated measurement cycles, with a slight dose dependence for the IRSL. In addition, five modified SAR procedures were used, varying preheats, filter combinations and method of measuring the luminescence signal. The D e values for all IRSL measurements were at least 50% greater than those for the [post-IR] OSL signal. A modified SAR sequence was also applied in which 0.1 s stimulations (using both IR and blue light sources) were made between all sample treatments. A lack of consistency in the measured luminescence sensitivity of the natural IRSL signal suggests that the [post-IR] OSL signal provides the more reliable value of D e.

Original languageEnglish
Pages (from-to)661-671
Number of pages11
JournalRadiation Measurements
Volume37
Issue number6
Early online date27 Sept 2003
DOIs
Publication statusPublished - Dec 2003

Keywords

  • fine grain
  • IRSL
  • QUARTZ
  • GREEN LIGHT
  • luminescence
  • OSL
  • SINGLE-ALIQUOT
  • ACCUMULATION
  • SPECTRA
  • single-aliquot regenerative-dose (SAR) protocol
  • INFRARED STIMULATED LUMINESCENCE
  • ALKALI FELDSPARS
  • loess
  • CHINESE LOESS PLATEAU
  • PROTOCOL
  • Loess
  • Single-aliquot regenerative-dose (SAR) protocol
  • Luminescence
  • Fine grain

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