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Polymeris G.S.,Athena Research and Innovation Center in Information | Kitis G.,Aristotle University of Thessaloniki
Applied Radiation and Isotopes | Year: 2012

The present work studies the thermally assisted photo transfer OSL (TAPT OSL) signal in the case of Al 2O 3:C samples showing double-structured main dosimetric TL peaks. The measurement signal provides indirect experimental evidence regarding the presence of deep traps along with one transfer mechanism extremely powerful and efficient. The experimental features of this signal are presented along with those yielded for samples with narrow TL peaks for the sake of comparison. In the framework of a dosimetric characterization, the straightforward relation observed between the TAPT OSL integrated intensity and the dose, even if non-linear, implies that this signal could be effectively used towards dosimetry purposes in the high dose region up to 250Gy. Furthermore, the study on the influence of the annealing temperature on the TL glow curve shape on Al 2O 3:C grains is attempted. The variety of glow curve shapes reported especially in the case of single grains is not affected by high temperature annealing, since its effect is dominant even after heating at 1085°C. Thus, this variety should not be correlated to the different deep trap occupancies, but rather be attributed to a possible structural defect. The main dosimetric TL peak af all grains is considered to be a composite of two unambiguously different traps of non-first-order kinetics. The low temperature part of these traps, reaching a maximum at ~190°C is an electron trap and the high temperature part with maximum at ~250°C is a hole trap. TL dose response of Al 2O 3:C grains presenting double peak structures is presented for the first time in literature, suggesting the usefulness on the applicability of Al 2O 3:C in the dose regime up to 100Gy. © 2012 Elsevier Ltd. Source

Oniya E.O.,Adekunle Ajasin University | Oniya E.O.,Athena Research and Innovation Center in Information | Polymeris G.S.,Athena Research and Innovation Center in Information | Tsirliganis N.C.,Athena Research and Innovation Center in Information | Kitis G.,Aristotle University of Thessaloniki
Geochronometria | Year: 2012

In the present work the sensitization of the entire glow-curve is studied in 6 different quartz samples of Nigerian origin. The investigation was applied to the un-fired "as is" samples as well as to samples fired at 900°C for 1 hour following cooling to room temperature. The results showed that in the case of "as is" glow-curve is sensitized as a whole. There is an abrupt transition from the "natural" sensitivity without any previous heating and the artificial sensitivity induced after the first heating. The sensitization is growing up strongly to the 10th heating but to a lower rate. The sensitization fac-tor of the TL glow-peak at "110°C" was found to be linearly correlated to the higher temperature TL peaks. In the case of annealed samples there is an initial increase between the sensitivity immediately after the end of annealing and after the first heating. As the number of heating is increased up to the 10th heating the sensitization is stabilized at a constant value. The results are discussed in the frame-work of existing models and implications of the sensitization effect in various applications, while some explanations are attempted. © 2012 Silesian University of Technology, Gliwice, Poland. Source

Ioannidis Y.,Athena Research and Innovation Center in Information | Raheb K.E.,Athena Research and Innovation Center in Information | Toli E.,Athena Research and Innovation Center in Information | Katifori A.,Athena Research and Innovation Center in Information | And 3 more authors.
Proceedings of the DigitalHeritage 2013 - Federating the 19th Int'l VSMM, 10th Eurographics GCH, and 2nd UNESCO Memory of the World Conferences, Plus Special Sessions fromCAA, Arqueologica 2.0 et al. | Year: 2013

This paper discusses issues related to digital storytelling and its use in Cultural Heritage institutions. It will demonstrate the usefulness and advantages of digital storytelling by providing concrete examples of adoption and suggest how digital storytelling may be used in different cultural heritage environments. We will identify issues and challenges and also focus on lessons learnt, all of them being important aspects for the further deployment of ICT in museums and collections. © 2013 IEEE. Source

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