Optimisation of preparation and measurement protocols for luminescence dating of small samples from a suite of porcelains and faiences
Part of : Mediterranean archaeology & archaeometry : international journal ; Vol.10, No.4, 2010, pages 53-60
Issue:
Pages:
53-60
Abstract:
Experiments designed to evaluate protocols for preparation and luminescence measurement ofsmall samples (<100 mg) from high fired ceramics are described. These include: additive TL of untreatedmaterial; multiple stimulation (Predose TL, OSL, TL) of hydrofluoric washed fragments; Simplified Predose and SAR OSL of silicate powders from hydrochloric and fluorosilicic acid treatment. The 110°C TL signal in the Simplified Predose technique minimised required sample size, but growth with cumulative predose was sub‐linear. For exponential extrapolations 11/26 faience samples yielded results within 1σ of typological expectations, but substantial scatter was interpreted asrelating to radiation quenching effects. Extrapolation errors were investigated by deactivating samplesand regenerating their predose responses. Acid treatment of cores drilled from sherds enabledpreparation of mineral and grain‐size fractions while avoiding crushing effects, and damage to orcontamination by the glaze and decoration.Results of luminescence measurements indicate that future work should focus on the use of opendetection filter combinations to increase signal levels, to enable quenching corrections in predosemeasurements and the use of high temperature TL signals.
Subject:
Subject (LC):
Keywords:
TL, OSL, High fired ceramic, Core, Simplified predose, Additive‐regenerative
Notes:
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