TY - JOUR
T1 - A theoretical model for a new dating protocol for quartz based on thermally transferred OSL (TT-OSL)
AU - Pagonis, V.
AU - Wintle, A. G.
AU - Chen, R.
AU - Wang, X. L.
PY - 2008/2
Y1 - 2008/2
N2 - Recently a new dating procedure has been suggested, which is based on the thermally transferred optically stimulated luminescence (TT-OSL) signal that is measured after irradiated quartz is optically bleached and then preheated. Experimentally the TT-OSL signal was measured after a high temperature preheat (260 {ring operator} C for 10 s) following an optical bleach at 125 {ring operator} C for 270 s to deplete the fast and medium OSL components. The TT-OSL signal was measured for 90 s at 125 {ring operator} C in order to avoid the effect of re-trapping of electrons in the 110 {ring operator} C trap of quartz. The luminescence sensitivity changes were monitored by the OSL response to a test dose. In this paper, we use a modified version of a comprehensive model to simulate the complete experimental sequence of the new protocol, and to fit the experimental dose-response graphs of the OSL, TT-OSL and basic-TT-OSL signals for doses up to 4000 Gy. Two possible mechanisms for the production of the TT-OSL signals in this quartz are discussed, namely the double transfer mechanism suggested for the recuperation effect, and a single transfer mechanism in which the TT-OSL signal is due to the thermal transfer of charge from a "source trap" into the fast OSL trap of quartz. The results of the simulation indicate that the latter mechanism is more likely to be responsible for the observed TT-OSL dose growth in fine-grained quartz extracted from Chinese loess.
AB - Recently a new dating procedure has been suggested, which is based on the thermally transferred optically stimulated luminescence (TT-OSL) signal that is measured after irradiated quartz is optically bleached and then preheated. Experimentally the TT-OSL signal was measured after a high temperature preheat (260 {ring operator} C for 10 s) following an optical bleach at 125 {ring operator} C for 270 s to deplete the fast and medium OSL components. The TT-OSL signal was measured for 90 s at 125 {ring operator} C in order to avoid the effect of re-trapping of electrons in the 110 {ring operator} C trap of quartz. The luminescence sensitivity changes were monitored by the OSL response to a test dose. In this paper, we use a modified version of a comprehensive model to simulate the complete experimental sequence of the new protocol, and to fit the experimental dose-response graphs of the OSL, TT-OSL and basic-TT-OSL signals for doses up to 4000 Gy. Two possible mechanisms for the production of the TT-OSL signals in this quartz are discussed, namely the double transfer mechanism suggested for the recuperation effect, and a single transfer mechanism in which the TT-OSL signal is due to the thermal transfer of charge from a "source trap" into the fast OSL trap of quartz. The results of the simulation indicate that the latter mechanism is more likely to be responsible for the observed TT-OSL dose growth in fine-grained quartz extracted from Chinese loess.
KW - Dose-response curves
KW - OSL
KW - Quartz
KW - Quartz dating
KW - Thermally transferred OSL
UR - http://www.scopus.com/inward/record.url?scp=46549083957&partnerID=8YFLogxK
U2 - 10.1016/j.radmeas.2008.01.025
DO - 10.1016/j.radmeas.2008.01.025
M3 - ???researchoutput.researchoutputtypes.contributiontojournal.article???
AN - SCOPUS:46549083957
SN - 1350-4487
VL - 43
SP - 704
EP - 708
JO - Radiation Measurements
JF - Radiation Measurements
IS - 2-6
ER -