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    Determination of dosimetric properties of MgO doped natural amethyst samples
    (Pergamon-Elsevier Science Ltd, 2016) Nur, N.; Guckan, V.; Kizilkaya, N.; Depci, T.; Ahmedova, C.; Yucel, A.; Ozdemir, A.
    In this paper, the thermoluminescence (TL) dosimetric characteristics of MgO doped natural amethyst samples (Mg-NA) are presented. The morphologies and chemical structures of the powder form samples were identified using XRD, FTIR, SEM, SEM mapping and EDX. Comparison of the TL intensities showed that 10 wt% Mg-NA was nearly 150 times more sensitive than undoped amethyst and the main dosimetric properties proved that 10 wt% Mg-NA may be a promising phosphor for clinical and radiotherapy purposes. (C) 2016 Elsevier Ltd. All rights reserved.
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    A new activator strontium for magnesium tetraborate: PL and TL studies
    (Pergamon-Elsevier Science Ltd, 2016) Evis, D.; Yucel, A.; Kizilkaya, N.; Depci, T.; Kafadar, V. E.; Ozturk, E.; Yildirim, R. G.
    Strontium was used for the first time as an activator agent for magnesium tetraborate (MBO) and photoluminescence (PL) and thermoluminescence (TL) properties were determined using a spectrophotometer and a TL reader, respectively. The results proved that 0.25 wt% Sr ratio played an important role in prolonging the afterglow and the phosphor gave the main TL peak with the highest intensity at 200 degrees C like an ideal case. Therefore, it is worthwhile to carry out continuous and systematic research on it (C) 2016 Elsevier Ltd. All rights reserved.
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    Thermoluminescence properties of non-stoichiometric Li2Si2O5 synthesized from natural amethyst quartz
    (Elsevier Science Bv, 2016) Nur, N.; Guckan, V.; Kizilkaya, N.; Depci, T.; Ahmedova, C.; Ozdemir, A.; Altunal, V.
    In the present study, on the contrary of lots of researches, stoichiometric (s-LD) and non-stoichiometric (n-LD) lithium disilicate polycrystalline were tried to synthesize using easily available and cheap natural amethyst quartz samples collected from Balikesir Dursunbey Turkey as a starting material by the high temperature solid state method. Structure and morphology of s-LD and n-LD were done using XRD, FTIR and SEM, showing the main structure as lithium disilicate for n-LD. The findings showed that n-LD had better crystal structure and gave better TL response, so a detailed investigation on its main dosimetric properties was studied and presented in this paper. The thermoluminescence (TL) glow curve of n-LD consisted of 3 distinguishable peaks and the main peak was stable since TL sensitivity increased only 12% after 2 kGy of high dose exposure. The reusability results showed that TL intensity decreased maximum 21% and 16% for 5 Gy and 50 Gy, respectively after 11 repeated cycles and n-LD had a superlinearity index (g(D)=1.019). The main peak was just 5% faded in 4 weeks. Consequently, n-LD as a phosphor might be used in many fields concerning with the dose range from 0.1 Gy up to 100 Gy. (C) 2016 Elsevier B.V. All rights reserved.