Effect of Ag On the Structural and Thermoluminescence Properties of Lithium Magnesium Borate

Аннотация

The thermoluminescence (TL) behavior of a new type of glass system made up of lithium borate doped with magnesium oxide and co-doped sliver, known as LB:Mg/Ag, was examined. The Mg/Ag co- doped LB glasses can contribute to the development of high-performance thermoluminescent dosimetry (TLD) materials for ionizing radiation dose detection and quantification. We produced the glasses through the melt-quenching process and then characterized them to evaluate the influence of dopant concentration variation on the TL properties. The samples exhibited a single broad peak ranging between 160 and 190 °C, with the sample made up of 15 mol% Li, 2 mol% Mg, and 0.6 mol% Ag displaying an optimum TL response. Moreover, the glass that contained 0.6 mol% of Ag had the highest TL intensity. The glass showed minimum fading, excellent reproducibility and annealing procedure. The XRD profiles of the samples showed their true amorphous nature, while the FESEM morphology displayed their surface homogeneity and excellent transmittance. These attractive features of the results may be potential for radiation dosimetry. Keywords: Thermoluminescence, Borate glass, Phosphor doped, gold co-doped. Highlights • Two Ag co-doped lithium borate doped with magnesium oxide were made and characterized. Journal of Social Sciences and Humanities Research Fundamentals 46 https://eipublication.com/index.php/jsshrf 9 Journal of Social Sciences and Humanities Research Fundamentals • Overall properties of glasses were improved different preparations of lithium borate have been due to Ag co-doping. studied by Wall et al [6]. All the previous work led to a conclusion that Li2B4O7: Cu shows a unique but • TL glow carves of glasses showed a peak around extremely useful TL feature of perfect linearity in its TL 190 °C. response with dose up to 103 Gy followed by sublinear • Obtained glasses revealed excellent linearity behavior without any supralinearity [7]. index over the entire dose range. • Achieved best glass composition may be The current study aims to explore different TL features potential for radiation dosimeters. and kinetic parameters of dysprosium and phosphor oxides doped borate glass that is modified by lithium Introduction: Due to the high cost of the most popular and Strontium. These features include glow curve, thermoluminescence dosimeters and also due to some reproducibility, linearity, sensitivity, fading, effective complications attending its reuse such as permanent atomic number, and kinetic parameters. radiation damage effects [1]and the sensitivity to the temperature of heat treatment [2], our attention was METHODS directed toward new thermoluminescence materials such as borates. The borates are relatively stable 1 Samples Preparation chemical compounds and respond without serious Series of Li P(BO ) glasses of chemical compositions (85- 4 3 3 problems to attempts to dope them with TL sensitisers x) H BO + 15% Li CO+ 2% Mg+ x Ag (x = 0. 3 and 0.6 3 3 2 such as the rare earths, copper and manganese ions. mol%) The resultant materials show high sensitivity, linearity were synthesized using melt-quenching technique at and good storage properties. Also they avoid many of different concentrations of strontium ions then the the earlier problems such as fading, light sensitivity and optimum composition of strontium (2% Mg), choose for humidity sensitivity. doped with silver. The powder of the compounds was weighted and well-mixed using milling machine. The mixture was melted in an alumina crucible for one hr Lithium borate was first investigated as a TLD by using an electric furnace a NabGmbH at a temperature Schulman et al[3]. The material was prepared by of 1300 oC. The Li2CO3 (purity 99 +%), H3BO3 (purity melting Li2CO3 and H3BO3 at 9508C, which is higher 99.98%) and Mg (purity 99.9%), Ag (purity 98%) were than the melting point of 9178C, then rapidly cooled to supplied by Syarikat Pustaka Elit, Johor Bahru, room temperature. The resultant glassy material was Malaysica. After completion of melting, the liquid glass then crystallized by subsequent heating at 6508C. The was poured and quenched on well-polished pre-heated dopants were added at the melt stage. Rzyski and steel plate. Then, the samples were annealed at 400 oC Morato[4], studied the rare earth doped lithium for three hr to eliminate the mechanical stress. The tetraborate samples in the glassy state by optical nominal compositions of the samples are given in absorption. The preparation and characteristics of Tables 1 Li2B4O7:Cu phosphor has been investigated by Takenaga et al[5], using the sintering method. In the same regard the thermoluminescence properties of Table 1: Compositions and coded of co-doped glass samples. Samples Concentration (mol %) code Li CO Mg H BO Ag 2 3 3 3 B1 15 2 82.995 0.3 B2 15 2 82.99 0.6 morphology, purity and the phase homogeneity of 2 Samples Characterizations these glasses are analyzed via field emission scanning The amorphous nature of all samp