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Article Citation - WoS: 50Citation - Scopus: 54The Effect of Synthesis and Doping Procedures on Thermoluminescent Response of Lithium Tetraborate(Elsevier Science Sa, 2011) Pekpak, E.; Yilmaz, A.; Ozbayoglu, G.Lithium tetraborate has been a scientific focus since 1960s by the courtesy of the thermoluminescence property it possesses. Moreover, it is utilized in surface acoustic wave apparatuses, in sensor sector and in laser technology owing to its non-linear optical characteristics. For the uses in thermoluminescence dosimetry lithium tetraborate is activated by addition of a variety of metals as dopants. This study includes the synthesis of lithium tetraborate by two methods (high temperature solid state synthesis and water/solution assisted synthesis), doping of activators into the matrix material synthesized and characterization of the products. Lithium tetraborate is readily commercially available in TL (Themoluminescence) dosimetry; hence, the main aim in this study was to specify the effect of synthesis and doping methods on the TL response. The heating temperature for the synthesis was 750 degrees C and the retention time as selected as 4 h for both methods. The synthesis stages were followed by doping step where the compounds of Cu, Ag and In in different proportions were doped in lithium tetraborate by solid state and solution assisted doping techniques. Characterization of the product was achieved by X-ray diffraction (XRD). Fourier transform Infra Red Spectroscopy (FT-IR) and Scanning Electron Microscopy (SEM) techniques. All samples prepared displayed TL response and the best TL signal was obtained from the sample produced by solid state synthesis and doped by solution assisted method with 0.1% Cu and 0.004% Ag. (C) 2010 Elsevier B.V. All rights reserved.Conference Object Effect of Synthesis Methods, Doping Methods, Metals and Metal Contents on the Dosimetric Properties of Lithium Tetraborate(RAD Association, 2012) Yilmaz,A.; Ozbayoǧlu,G.Thermoluminescent dosimeter (TLD) needs to have some features such as; a simple glow curve structure, a high gamma ray sensitivity, low fading of TL signal, linear dose-response relationship, simple annealing procedure for reuse, chemical stability and inertness to extreme climatic variations, insensitive to daylight, suitable effective atomic number (Zeff), close to that of soft tissue which is 7.42. The effective atomic number of lithium tetraborate is (7.42), which is almost the same as that of the biological tissue. Due to that reason, in this research, Lithium tetraborate: Li2B4O7, has been synthesized by different methods, such as, high temperature solid state synthesis and solution assisted synthesis methods. After preparing the host material, Cu and Mn were doped with different concentrations. TL glow curves of Mn and Cu doped LTB samples produced by using different synthesis and doping methods and Ag, P and Mg co-doped samples were investigated for comparison. All samples prepared displayed TL response and the best TL signal was obtained from the sample produced by solid state synthesis and doped by solution assisted method with 0.1% Cu and 0.004% Ag. High temperature solid-state synthesis of LTB and high temperature solid-state doping of Mn gave better glow curves with 1 wt% Mn content than other products with different synthesis and doping methods and than other percentages of Mn in LTB with two separable glow peak at 77 °C and 280 °C with high intensity. The addition of Ag as co-dopant shifted the main glow peak to 200 °C. P increased the intensity of glow peak at 280 °C. Mg increased the glow curve complexity. © 2012 RAD Conference Proceedings. All rights reserved.
