Browsing by Author "Kitis, George"
Now showing items 1-20 of 25
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The 110°C Thermoluminescence peak as a probe in bioactivity study of the 58S sol-gel bioactive glass
Polymeris, George S.; Goudouri, Ourania Menti; Paraskevopoulos, Konstantinos M.; Kitis, George (Trans Tech Publications Ltd, 2011-11-06)Results of the present study provide strong indications towards the effective application of the 110°C Thermoluminescence (TL) peak in discriminating between different bioactive responses for the case of the 58S bioactive ... -
Component resolved IR bleaching study of the blue LM-OSL signal of various quartz samples
Polymeris, George S.; Güneç Kıyak, Nafiye; Kitis, George (Wind-J Wojewoda Publ Co, 2008-01-01)The present work provides an initial component resolved analysis concerning the effect of infra-red (IR) exposure at elevated temperatures on the blue LM-OSL signal of quartz (stimulated at 470 nm). The study was performed ... -
Component resolved OSL dose response and sensitization of various sedimentary quartz samples
Güneç Kıyak, Nafiye; Polymeris, George S.; Kitis, George (Elsevier Ltd, 2007-02)The structure of the linearly modulated optically stimulated luminescence (LM-OSL) signal was studied for four sedimentary quartz samples, collected from different sites around Istanbul, Turkey. Applying a computerized ... -
Component-resolved thermal stability and recuperation study of the LM-OSL curves of four sedimentary quartz samples
Kitis, George; Polymeris, George S.; Güneç Kıyak, Nafiye (Elsevier Ltd, 2007-09)Thermal stability as well as recuperation stands among the crucial general characteristics of different OSL components in quartz. Through a series of thermal stability and recuperation experiments, in conjunction with curve ... -
The correlation of fast OSL component with the TL peak at 325 degrees C in quartz of various origins
Kitis, George; Güneç Kıyak, Nafiye; Polymeris, George S.; Tsirliganis, Nestor C. (Elsevier Science BV, 2010-02)The fast component of the optically stimulated luminescence (OSL) signal in quartz is the basic tool for the optical dating. Its relation with the thermoluminescence (TL) glow-peak at about 325 degrees C is well established ... -
Dating fossil root cast (Black Sea coast, Turkey) using thermoluminescence: Implications for windblown drift of shelf carbonates during MIS 2
Polymeris, George S.; Kitis, George; Güneç Kıyak, Nafiye; Theodosoglou, Eleni; Tsirliganis, Nestor C.; Ertek, Topçu Ahmet; Erginal, Ahmet Evren (Elsevier Ltd., 2016-05-16)Rhizoliths are mostly sub-aerially exposed root prints which appear through removal of the rock units that cap them. A horizontal-lying residual of a rhizolith, consisting purely of soft inner core material of white color ... -
Dissolution and subsequent re-crystallization as zeroing mechanism, thermal properties and component resolved dose response of salt (NaCl) for retrospective dosimetry
Polymeris, George S.; Kitis, George; Güneç Kıyak, Nafiye; Sfamba, Ioanna; Subedi, Bhagawan; Pagonis, Vasilis (Pergamon-Elsevier Science Ltd, 2011-09)In the present study we report dosimetric properties of iodized salt aiming at using it as an accidental luminescent dosimeter. It was found that the very good sensitivity of its main dosimetric peak is strongly affected ... -
The firing temperature of pottery from ancient Mesopotamia, Turkey, using luminescence methods: a case study for different grain-size fractions
Polymeris, George S.; Güneç Kıyak, Nafiye; Koul, Dileep K.; Kitis, George (Wiley-Blackwell, 2014-10)The assessment of the firing temperature of a prehistoric pottery sample collected from ancient Mesopotamia, Turkey was studied using luminescence techniques. The methods for this estimation involved the observation of the ... -
In-homogeneity in the pre-dose sensitization of the 110 degrees C TL peak in various quartz samples: The influence of annealing
Polymeris, George S.; Oniya, Ebenezer O.; Jibiri, Nnamdi N.; Tsirliganis, Nestor C.; Kitis, George (Elsevier Science BV, 2012-03-01)The pre-dose sensitization effect of the 110 degrees C TL glow-peak of quartz is a basic tool in thermoluminescence and optically stimulated luminescence dating and retrospective dosimetry. In the present work, a homogeneity ... -
Investigation of OSL signals from very deep traps in unfired and fired quartz samples
Kitis, George; Güneç Kıyak, Nafiye; Polymeris, George S.; Pagonis, Vasilis (Elsevier Science BV, 2010-03-15)This paper presents an attempt to isolate experimentally optically stimulated luminescence (OSL) signals which may originate from very deep traps (VDT) in quartz samples. As VDT we consider those traps which are responsible ... -
Investigation of the OSL signal from very deep traps in natural quartz
Kitis, George; Güneç Kıyak, Nafiye; Polymeris, George S.; Pagonis, Vasilis (Univ Agean, Dept Mediterranean Stud, 2010)It has been recently reported by several studies that a thermally transferred optically stimulated luminescence (TT-OSL) signal from quartz grains can be used to extend the dating range for quartz samples. The TT-OSL signals ... -
IRSL dating of a deep water core from Pylos, Greece; comparison to post ir blue OSL and TL dating results
Polymeris, George S.; Kitis, George (Univ Agean, 2011)The 'double SAR' protocol procedure permits the determination of two equivalent dose (De) values for each polymineral aliquot; an IRSL De resulting mostly from feldspars along with a post-IR OSL De for a mixed signal for ... -
LM-OSL thermal activation curves of quartz: Relevance to the thermal activation of the 110 degrees C TL glow-peak
Güneç Kıyak, Nafiye; Polymeris, George S.; Kitis, George (Pergamon-Elsevier Science Ltd, 2008-01)The thermally activated characteristics (TAC) of the linearly modulated optically stimulated luminescence (LM-OSL) signals of seven quartz samples from different origin were studied relative to the TAC of their respective ... -
Preliminary results towards the equivalence of transformed continuous-wave Optically Stimulated Luminescence (CW-OSL) and linearly-modulated (LM-OSL) signals in quartz
Kitis, George; Polymeris, George S.; Güneç Kıyak, Nafiye; Pagonis, Vasilis (Versita, 2011-09)The present paper presents a comparative experimental study of two commonly measured Optically Stimulated Luminescence (OSL) signals in quartz. The experimental study measures both the continuous wave OSL (CW-OSL) and the ... -
Preliminary TL and OSL investigations of obsidian samples
Polymeris, George S.; Gogou, D.; Afouxenidis, Dimitrios; Rapti, S.; Tsirliganis, Nestor C.; Kitis, George (Univ Agean, Dept Mediterranean Stud, 2010)Obsidian is a volcaniclastic mineral extremely hard to break, which was used in prehistoric Greece (and elsewhere in the World), in order to provide tools, weapons, knives and arrowheads. The present work aims to characterize ... -
Reconstruction of thermally quenched glow curves in quartz
Subedi, Bhagawan; Polymeris, George S.; Tsirliganis, Nestor C.; Pagonis, Vasilis; Kitis, George (Pergamon-Elsevier Science Ltd, 2012-04)The experimentally measured thermoluminescence (TL) glow curves of quartz samples are influenced by the presence of the thermal quenching effect, which involves a variation of the luminescence efficiency as a function of ... -
Relative response of TL and component-resolved OSL to alpha and beta radiations in annealed sedimentary quartz
Polymeris, George S.; Afouxenidis, Dimitrios; Raptis, Spyridoula; Liritzis, Ioannis; Tsirliganis, Nestor C.; Kitis, George (Pergamon-Elsevier Science Ltd, 2011-10)Knowledge of the relative luminescence response to alpha and beta radiation is very important in TL and OSL dating. In the present study the relative alpha to beta response is studied in a sedimentary quartz sample, ... -
Temperature lags of luminescence measurements in a commercial luminescence reader
Güneç Kıyak, Nafiye; Kitis, George; Polymeris, George S. (Elsevier Science Inc, 2015-09-15)The temperature recorded in thermoluminescence and optically stimulated luminescence equipments is not the temperature of the sample but that of the heating element on which the thermocouple is attached. Depending upon the ... -
Thermal quenching of thermoluminescence in quartz samples of various origin
Subedi, Bhagawan; Oniya, Ebenezer O.; Polymeris, George S.; Afouxenidis, Dimitrios; Tsirliganis, Nestor C.; Kitis, George (Elsevier Science BV, 2011-03-15)The effect of thermal quenching stands among the most important properties in the thermoluminescence (TL) of quartz on which many applications of TL are based. Since the quartz samples used in various applications are all ... -
Thermal quenching of thermoluminescence in quartz samples of various origins
Subedi, Bhagawan; Afouxenidis, Dimitrios; Polymeris, George S.; Bakoglidis, Konstantinos D.; Raptis, Spyridoula; Tsirliganis, Nestor C.; Kitis, George (Univ Agean, Dept Mediterranean Stud, 2010)The effect of thermal quenching plays an important role in the thermoluminescence (TL) of quartz on which many applications of TL are based. In present work it is investigated that the thermal quenching parameters i.e. the ...
