LUMINESCENCE DATING OF CULTURAL HERITAGE CERAMIC SAMPLES: INNOVATIVE APPROACHES IN DATA TREATMENT
Luminescence measurements in small sampling using micro-invasive methodologies to study cultural heritage are a challenge due to the very low amounts of quartz grains obtained after chemical and physical protocols. So, luminescence data treatment is complex particularly for the absorbed dose (AD) acquisition. Significant achievements were obtained for the determination of the AD applying both thermally and optically stimulated luminescence. Different protocols were tested by using additive and regenerative luminescence measurements protocols, applied to single and multiple aliquots of quartz grains enriched fractions from ceramics. In the case of micro samples, the use of SAR-TSL (single aliquot regenerative-thermally stimulated luminescence) protocol was the most favorable for the determination of the AD. With this optimized protocol we reduce problems associated with the differences between aliquots (amount, composition, sensibility and sensitization) relative to additive protocols, leading to results statistically more reliable. This improvement of the AD determination decreases the uncertainty of the luminescence age calculation.