The Effect of TiO2 and MgO on the Thermoluminescence Properties of a Lithium Potassium Borate Glass System

• Published in: The Journal of physics and chemistry of solids 2013-12, Vol.74 (12), p.1816-1822
• Main Authors: Alajerami, Y.S.M., Hashim, S., Ghoshal, S.K., Saleh, M.A., Kadni, T., Saripan, M.I., Alzimami, K., Ibrahim, Z., Bradley, D.A.
• Format: Article
• Language: English
• Subjects: A. Semiconductors; Borates; C. X-ray diffraction; D. luminescence; Dosimeters; Glass; Lithium; Magnesium oxide; Potassium; Thermoluminescence; Titanium dioxide
• ISSN: 0022-3697; 1879-2553
• DOI: 10.1016/j.jpcs.2013.07.013

The influence of dopant TiO2 and co-dopant MgO on the thermoluminescence (TL) properties of lithium potassium borate glass (LKB) is reported in this paper. The glow curve exhibits a prominent peak (Tm) at 230°C. The TL intensity was enhanced by a factor of ~3 due to the incorporation of MgO, and this was attributed to the creation of extra electron traps mediated by radiative recombination energy transfer. We achieved good linearity of the TL yield with dose, low fading, excellent reproducibility and a promising effective atomic number (Zeff=8.89), all of which are highly suitable for dosimetry. The effect of heating rate, sunlight and dose rate on the TL are also examined. These attractive features demonstrate that our dosimeter is useful in medical radiation therapy. • Enhancement of about three times has been shown with the MgO increments. • The MgO impurities are cross linked with the TiO2 defect. • The TiO2 enhances the intensity by 100 times compared to pure LKB. • The addition of MgO improved the TL and PL intensity by ~2.7x. • The LDD = 2.58 mGy. Fading is reduced 8% after 10 days and 17% after 90 days.