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Thermoluminescence, glow curves and carrier traps in colored and nominally pure LiF crystals

Baldacchini G.¹, Chiacchiaretta P.¹, Gupta V.², Kalinov V.³, Voitovich A.P.³

¹ENEA, Frascati Research Center, Department of Physical Technologies and New Materials, Frascati, Roma, Italy
²Department of Materials & Metallurgical Engineering, Indian Institute of Technology-Kanpur, Kanpur, Uttar Pradesh, India
³Institute of Physics, Academy of Sciences of Belarus, Minsk, Belarus

Email: baldacchini@frascati.enea.it

Выставление онлайн: 20 августа 2008 г.

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Thermoluminescence (TL) of nominally pure LiF crystals irradiated with gamma rays has been studied in connection with color centers (CCs) generated during ionizing irradiation. A close analysis of the experimental TL spectra has unveiled the existence of 10 glow peaks (GPs) spanning from 100 to 450^oC. The relatively well resolved GPs up to 263^oC have been associated to F⁺₃, F₃ and F₂ CCs, while the remaining tangled ones have been attributed to F and F-like CCs. A first order kinetics approach has been used to simulate the TL spectra, and the appropriate parameters of the carrier traps have been obtained. A critical analysis of their values has shown on one side the usefulness of using pure crystals to understand their basic contributions to TL, and on the other side the possible existence of further weak GPs and the role still played by the residual amount of impurities. V.S. Kalinov is grateful to ENEA for a fellowship allowing him the carrying out of part of this work in Frascati. PACS: 78.60.Kn, 61.72.Ji, 81.40.Ef, 78.40.Ha

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