Radiation dose response correlation between thermoluminescence and optically stimulated luminescence in quartz |
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Authors: | E.O. Oniya G.S. Polymeris N.C. Tsirliganis G. Kitis |
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Affiliation: | 1. Physics and Electronics Department, Adekunle Ajasin University, PMB 01, Akungba Akoko, Nigeria;2. Archaeometry Laboratory, Cultural and Educational Technology Institute (C.E.T.I.), R.C. “Athena”, Tsimiski 58, GR-67100 Xanthi, Greece;3. Aristotle University of Thessaloniki, Nuclear Physics Laboratory, 54124 Thessaloniki, Greece |
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Abstract: | The fast, linearly modulated optically stimulated luminescence (LM-OSL) component in quartz is the main dosimetric signal used for the dating applications of this material. Since the blue light stimulation (470 nm, 40 mW cm ) time needed to obtain the fast LM-OSL component is less than 50 s the electron trapping levels responsible for it are still highly populated. In this way an active radiation history is created which could play an important role in the dosimetric characteristics of the fast OSL signal. In the present work the dose response behavior of the fast OSL signal is investigated in quartz samples with an annealed radiation history and quartz samples possessing an artificial radiation history. A computerized curve de-convolution analysis of the LM-OSL curves for 50 s stimulation time showed that it consists of three individual OSL components. The faster component C1 with peak maximum time around 5 s has a linear dose response in virgin samples, which turns to a slight superlinearity as a function of the artificial radiation history. On the other hand the component C2 with peak maximum time at 12 s is slightly superlinear which turns into strong superlinearity as a function of artificial radiation history. Finally, component C3 with peak maximum time at about 45 s is strongly superlinear for both virgin samples and as a function of artificial radiation history. The implications to practical application are discussed. |
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