Equivalent dose of quartz originating from ceramics obtained by OSL SAR method – Tests of protocol parameters

• 160 °C and 200 °C TL traps in quartz from brick influence the OSL process at 125 °C.
• The De from SAR protocol for brick samples depends on OSL measurement temperature.
• OSL component analysis for different measurement temperatures is presented.
• Lower temperature of OSL readout in SAR protocol for quartz from bricks is suggested.

In the standard OSL dating procedure, the OSL signal is measured at 125 °C. For quartz samples from bricks the presence of traps responsible for the 160 °C and 200 °C TL peaks has an influence on the OSL process, just like the one for the traps responsible for the 110 °C TL peak. In order to examine the significance of this disturbance for dating results, a series of measurements of De was carried out for various temperatures of the OSL readout in SAR protocol. For most samples, significant fluctuations of De values were obtained, especially at temperatures above 90 °C. Also the analysis of OSL components carried out for curves obtained at different measurement temperatures shows that the TL traps active up to 200 °C make the OSL process more complex. The measurement at 125 °C does not assure the exclusion of shallow traps from the OSL process. A reasonable solution of this problem may be the choice of temperatures below the range of dominant TL peaks, in the SAR protocol for OSL measurements.