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

Abstract

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.

Thermoluminscence characteristics and dosimetric parameters of Nd+3 doped alkali borosilicate glass

“…Low heating rate gives a wide opportunity to the electrons in the traps to completely evacuate, producing the low‐temperature glow curve. High heating rates, around 5‐20°C/s, on the other hand, the traps release their electrons quicker and hence glow curves quickly formed, shifting their peaks to high temperatures …”

“…Borate glasses doped with alkali metal ions and/or rare earths have been extensively studied as thermoluminescence dosimetric materials; because they have several dosimetric properties compared with the other glass dosimeters …”

Enhancing the radiation dose detection sensitivity of optical fibres

“…In recent years several materials have been the basis of new dosimeters with sensitivity and/or properties that improve upon existing capabilities, as for instance glass-based dosimeters doped with rare-earth materials. Examples of dopants and compounds include aluminium, copper (I), germanium, manganese, tin, zinc (Yusoff et al, 2005), lithium and barium (Timar-Gabor et al, 2011), zirconium oxide (ZrO 2 ) (Salah et al, 2011), copper activated calcium borate (CaB 4 O 7 :Cu) nanocrystals (Erfani Haghiri et al, 2013a), manganese doped calcium tetraborate (CaB 4 O 7 :Mn) nanocrystal (Erfani Haghiri et al, 2013b), lithium potassium borate glass doped with titanium oxide (TiO 2 ) and magnesium oxide (MgO) (Alajerami et al, 2013), dipotassium yttrium fluoride Contents lists available at ScienceDirect journal homepage: www.elsevier.com/locate/apradiso (K 2 YF 5 ) crystals doped with samarium (Sm 3 þ ) and terbium (Tb 3 þ ) ions (Marcazzó et al, 2013). An additional form of glass based dosimeter that has attracted considerable and growing attention are silica-based optical fibres , offering a range of advantages over other passive dosimeter types.…”

γ-Ray induced thermoluminescence characteristics of the PbO–Al2O3–SiO2:Pr3+glass system

“…However, due to its low corrosion resistance this material was replaced by several other non-tissue equivalent amorphous phosphate, aluminosilicate materials [3]. Bradley and his co-workers have carried out extensive investigation on TL emission of a variety of glass materials [4][5][6]. In general in aluminum silicates Al ions participate in the glass network with AlO 4 structural units and there is a possibility for the cross linking (between Al tetrahedra and Si tetrahedra) like Al-O-Si.…”