| Popis: |
In this study we test, for the first time, the potential of an elevated temperature post-IR IR (pIRIR 290 ) SAR protocol for the dating of young heated artefacts. Seven heated stones and seven potshards were collected from three different archaeological sites in Denmark: one site from the early Pre-Roman Iron Age 200 BC to AD 100, and two from the Viking period between AD 800 and 1200. We first derive quartz OSL ages for these samples, to support the archaeological age control. The luminescence characteristics of the pIRIR 290 signal are then investigated; in particular the dose recovery ratios are shown to be close to unity. The performance of the feldspar pIRIR 290 protocol is then examined by comparing the pIRIR 290 ages with those based on the quartz OSL signal; the average ratio of pIRIR 290 to OSL ages is 1.14 ± 0.05 (n = 14) and there is some suggestion that the possible overestimation of the feldspar ages compared to quartz is only of significance for the heated stone samples. Nevertheless, there is no indication of incomplete heating of the stones; the ratios of D e derived from the IR 50 and pIRIR 290 signals are independent of sample type, and consistent with complete resetting by heating. Comparison with the archaeological age control is not able to identify whether quartz or feldspar provides the most reliable dating signal. |
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