On the application of quasi-equilibrium conditions to the numerical analysis of simultaneous TL/TSC measurements

• Autorzy: Mandowski, A. , Świątek, J.
• Języki publikacji: EN

Abstrakty

EN

Thermally stimulated relaxation (TSR) phenomena are analysed on the basis of several analytical approximations. These approximations - e.g. the general order kinetics (GOK) model and the mixed order kinetics(MOK) are usually oversimplified with respect to the real phenomena under study. Therefore, the application of these equations often leads to erroneous results or misleading interpretations. Some recent papers have shown the advantage of using certain formulae directly derived from the simple trap model to the analysis of thermoluminescence (TL) and thermally stimulated conductivity (TSC) experiments. These equations allow to construct very fast and efficient algorithms to determine trap parameters by application of nonlinear fitting methods. The only disadvantage of this approach is a relatively high number of unknown parameters. To overcome the difficulty we applied the equations to simultaneous TL/TSC measurements, which are closely related phenomena. Using same previously derived relations it was possible to reduce the number of parameters of the model. To test the accuracy of the method the fitting algorithm was applied to a series of computer generated TL/TSC curves calculated from the simple trap model equations.

Słowa kluczowe

PL

analiza numeryczna; analiza termoluminescencji; przewodnictwo stymulowane termicznie

EN

numerical analysis; analysis of thermoluminescence; thermally stimulated conductivity

• Czasopismo: Prace Naukowe. Chemia / Wyższa Szkoła Pedagogiczna w Częstochowie
• Rocznik: 2001
• Tom: Vol. 5
• Strony: 79--86
• Opis fizyczny: Bibliogr. 13 poz., rys., tab.

Twórcy

autor

Mandowski, A.

• Institute of Physics, Pedagogical University ul. Armii Krajowej 13/15, 42-200 Częstochowa, Poland

autor

Świątek, J.

• Institute of Physics, Pedagogical University ul. Armii Krajowej 13/15, 42-200 Częstochowa, Poland

Bibliografia

• [1] R. Chen and S.W.S. McKeever, Theory of Thermoluminescence and Related Phenomena, Singapore: World Scientific, 1997.
• [2] R. Bindi, D. Lapraz. P. Iacconi and S. Boutayeb, "Theoretical analysis of the simultaneous detection method of the thermally stimulated conductivity (TSC) and luminescence (TL); application to an ɑ-Al2O3 monocrystal," J. Phys. D: Appl. Phys. 27, 2395-2400, 1994.
• [3] P. Kelly and P. Braunlich. “Phenomenological Theory TL," Phys. Rev. B 1, p. 1587, 1970.
• [4] Lewandowski A.C., McKeever S.W.S. , "Generalised description of thermally stimulated processes without the quasiequilibrium approximation" Phys. Rev. Vol. B 43, 8163-8178, 1991.
• [5] A. Mandowski and J. Świątek, “A method for determining the density of deep traps by using the simultaneous TL/TSC measurement technique" J. Phys. D: Appl. Phys. 25, 1829-1833, 1992.
• [6] A. Mandowski and J. Świątek, "Determination of trap parameters from generalised initial rise equations", Radiat. Prot. Dosimetry. 65, 55-58, 1996.
• [7] A. Mandowski and J. Świątek, "New fitting algorithm for the determination of trap parameters from TL curves", Radiat. Prot. Dosimetry, 84, 123-126, 1999a.
• [8] A. Mandowski and J. Świątek, "New method for the determination of trap parameters from TSC curves", Proc. of ISE-10, Delphi (Greece), 359-362, 1999b.
• [9] A. Opanowicz and K. Przybyszewski, “Is the quasi-equilibrium approximation in description thermally stimulated luminescence and conductivity valid?", Proc. of SPIE, 2373, 236-240, (1995).
• [10] A. Opanowicz, "Determination of the kinetics parameters by the simultaneous measurements of thermally stimulated conductivity and luminescence", Journal of Applied Physics 86, 6189-6195 (1999).
• [11] C.M. Sunta, W.E. Ferya Ayta, R.N. Kulkarni, T.M. Piters and S. Watanabe, "Theoretical models ot thermoluminescence and their relevance in experimental work", Radiat. Prot. Dosimetry, 84, 25-28, 1999a.
• [12] C.M. Sunta, W.E. Ferya Ayta, J.F.D. Chubaci and S. Watanabe,"Quasi-equilibrium assumption in analytical models of thermoluminescence and its validity in practical cases", Radiat. Prot. Dosimetry, 84, 51-54, 1999b.
• [13] C.M. Sunta, W.E. Ferya Ayta, R.N. Kulkarni, J.F.D. Chubaci and S. Watanabe, "The quasi-equilibriurn approximation and its validity for the thermoluminescence of inorganic phosphors", J. Phys. D: Appl. Phys.32,717-725, 1999c.