Investigating the contribution of recuperated TL to post-IR IRSL signals in a perthitic feldspar

Authors Organisations
Type Article
Original languageEnglish
Pages (from-to)82-87
Number of pages6
JournalRadiation Measurements
Volume49
Early online date17 Dec 2012
DOI
Publication statusPublished - Feb 2013
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Abstract

Using a museum specimen of perthitic feldspar, the characteristics of post-IR IRSL production at 200 °C after different prior IR bleaching at 100 °C were investigated. It was found that the post-IR IRSL signal had an isothermal TL contribution that was unexpected following a previous preheat at 320 °C; this is the result of isothermal decay of recuperated TL peaks resulting from photo-transfer that occurred when the previous IRSL signal was measured at a lower temperature. The isothermal TL contribution to the post-IR IRSL signal depends on prior IR bleaching conditions. Since the recuperated TL signal comes from photo-transfer during IRSL production, this signal should also suffer from anomalous fading. Thus, it is suggested that this isothermal TL contribution to the measured post-IR IRSL is removed by the inclusion of an additional step, a cut-heat to 300 °C, in the post-IR IRSL dating protocol.

Keywords

  • K-feldspar, IRSL, photo-transfer, recuperated TL, isothermal TL, post-IRE IRSL