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Luminescence is a phenomenon occurring in crystal materials, when electrons, trapped in special energy stages (traps) caused by defects in crystal structures, are released and emitting light (luminescence) which wavelength corresponds the change in charge carriers energy stages during the process.Electrons are getting trapped because of the natural radioactive background radiation.more In the present study, an attempt is being made to date samples from three archaeological sites in the Mediterranean using surface luminescence dating techniques.The methods are well established and this study is an effort to apply it to monuments that have not being dated with these methods before.In collaborative work with statistical specialists (Andrew Millard and Michael Goldstein) Bayesian analysis has been applied to the calculation and analysis of luminescence ages and Jeremy Disley is currently developing further the work completed by Alicia Huntriss (EPSRC CASE studentship with English Heritage).Active areas of research in which potential doctoral projects can be defined include the dating of: irrigation systems in arid regions; upland Palaeolithic sites in Southern Britain; coastal sites with preserved aeolian deposits; the construction of early medieval buildings.When electrons are released from traps the intensity of emitted luminescence follows linearly the amount of released electrons and can be used to find out the total amount of trapped electrons.

The methods are well established and this study is an effort to apply it to...The longer the crystals are affected by this radiation the more electrons are trapped.Electrons can be released from traps by stimulating the crystals with external energy for example by heating (thermoluminescence, TL) or by lighting (optically stimulated luminescence, OSL).This total dose can be used to the age determination when we measure the dose rate of radiation that has given that dose.Age (the time from the latest emptying of traps) can be found out by dividing the total dose with dose rate.




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