Ponente: Dra. Helen Khoury
Abstract:
Optically Stimulated Luminescence (OSL) is the luminescence emitted from a previously irradiated material with ionizing radiation by exposure to light. OSL has a number of operational advantages compared to thermoluminescent (TL) dosimetry, such as (a) simplicity of theoretical concepts and interpretation of signals; (b) optical readout and bleaching of dosimeters without heating, and (c) compact, simple and rather inexpensive instrumentation (Yukihara et al., 2015). Pure calcium fluoride (CaF2) is an example of one of these OSL materials that has been recently studied, predominantly in its natural form of fluorite. However, the use of natural fluorite for dosimetry applicationsis difficult due to varying types of impurities and concentrations. For this reason, efforts were made to produce synthetic materials with controlled types of dopants and of concentrations. Various methods have been employed to synthesize doped CaF2, including sol-gel techniques, ion beam implantation, solvent evaporation, electrochemical route, and combustion synthesis. Our research group is using the Solution Combustion to investigate the OSL response of CaF2:RA for Blue (BSL) and Infra-red (IRSL) Stimulation Luminescence.
In this talk we present the results on the Blue Stimulation Luminescence (BSL) and InfraRed Stimulation Luminescence (IRSL) of CaF2:Tm; CaF2(Ce) produced by the Solution Combustion Synthesis method. We will discuss the OSL response with the dopant concentration, and the reproducibility, stability and dose response of the IRSL and BSL responses of these materials.
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