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SEARCH FOR STABLE ENERGY LEVELS IN MATERIALS EXHIBITING STRONG ANOMALOUS FADING: THE CASE OF APATITES

Authors
Journal
Journal of Luminescence
0022-2313
Publisher
Elsevier
Volume
153
Identifiers
DOI: 10.1016/j.jlumin.2014.03.041
Keywords
  • Anomalous Fading
  • Thermoluminescence (Tl)
  • Optically Stimulated Luminescence (Osl)
  • Thermally Assisted Osl (Ta-Osl)
  • Apatites

Abstract

Abstract The Thermally Assisted OSL signal resulting from Very Deep Traps was studied in the case of three fluorapatite samples, one chlorapatite as well as one collophanite cryptocrystalline carbonite phosphorite sample of various origins. Intense Thermally Assisted OSL signal was monitored while stimulating at 200°C in all samples subjected to the present study, indicating the prevalence of the existence of these Very Deep Traps. Anomalous fading effect is ubiquitous for all TL and OSL signals of all apatite samples subjected to the present study. The anomalous fading of the Thermally Assisted OSL signal arising from Very Deep Traps is strongly differentiated from the anomalous fading of electron trap excited at temperatures below 500°C. The Thermally Assisted OSL signal arising from Very Deep Traps was found to clearly be more stable, showing much less anomalous fading over time. The possible implications of this finding in dating of both apatites and feldspars are also briefly discussed.

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