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Luminescence dating of the Tanagra terracottas of the Louvre collections

Zink A., Porto E.

Geochronometria

2005

Vol. 24

21-26

In connection with the exhibition Tanagra - Myth and Archaeology (Paris, 2003; Montreal, 2004), we investigated the authenticity of some 140 terracottas from the Louvre collections by luminescence dating (thermoluminescence and optically stimulated luminescence). For these terracottas being pieces from a collection, only the dose due to internal radioactivity could be derived from the direct measurement of the internal concentration of radioelements. To estimate the contribution of the external environment, we had to reconstruct the moisture content and the gamma dose rate. The moisture content was based on some indications about the site found in 19th century literature. We reconstructed the external dose rate received by the Tanagras from the ratio of the measured palaeodose to 2300 years. This result agrees well with a low radioactive soil known to be characteristic of the mainland Greece. Applying such values of the external dose rate to our Tanagra, we obtained an age distribution showing two maximums, one at 2300 š 400 years, the other at 150 š 50 years.