Thermoluminescence Properties of Aluminium Oxide doped Strontium, Lithium and Germanium prepared by Combustion Synthesis method

Abstract

Abstract. In this work, Al2O3 doped with Sr, Li and Ge was prepared by combustion synthesis techniques for thermoluminescent (TL) ionizing radiation dosimetry applications. Dopants sample concentration were varied from 0.1 mol% to 5 mol% in order to study the effect of the concentration on the TL response. The optimum concentration was found to be 0.3 mol% for Sr and Li and 3.0 mol% for Ge. Based from the comparison of this doped material, the highest sensitivity was found for Ge doped and linear response for doses studied range of 10-80 Gy. X-Ray diffraction (XRD) patterns of the samples were recorded to confirm the formation of the sample. The sharp peaks present in the XRD confirms the sample is crystalline. The TL response of these samples for Co -60 gamma radiation were evaluated. It was observed a TL glow peak around 175°C for doped sample which is suitable for radiation dosimetry.

Complementary Assessment of Commercial Photoluminescent Pigments Printed on Cotton Fabric

“…Both vibrations, with slight shifting, were detected in the IR spectral lines of violet pigment, corresponding to Al-O vibration within the calcium aluminates, also demonstrated further by bands at 680 and 780 cm −1 . In the case of the blue pigment, the multiple bands stated above were noted in the metal-oxide range, which is a contribution of both oxides as such, or oxides potentially-doped with heavy alkaline-earth metals (such as Sr), used for luminescence enhancement [31]. The presence of functional groups on pigments’ surfaces can affect luminescence properties, as they are considered as special defects.…”