ESTUDIO DE TERMOLUMINISCENCIA TERMOTRASFERIDA EN FLUORUROS DOBLES DE POTASIO DOPADOS EN TERBIO Y SUS APLICACIONES.

Abstract

We present a study of first principles with experimental supporting the phenomenon of heat-transferred thermoluminescence observed in studies conducted by A. Gallegos1 and reported by A. Gallegos et al in Rev. Mex. Fis. S ( Feb. 2011 )2. This study presents a first possible explanation for this phenomenon observed in materials such double potassium fluoride and lanthanides and yttrium, lutetium and gadolinium-doped rare earth, terbium, with Dosimetry use. This phenomenon is characterized by decreased peak intensity low thermal stability and subsequent increase in peak intensity of a higher thermal stability after being treated in a isothermal storage at temperatures above 100 oC, which is I call heat-transferred thermoluminescence basic. Well characterized in the past for the recovery of the intensity of the thermo-luminescent glow curve after the material being subjected to several subsequent heating ramps, this was called heat-transferred thermoluminescence recovery. So to explain this thermal transfer which is observed during the final part of the stage of phase absorption of radiation, corresponding to the relaxation of the material after irradiation with ionizing radiation, used the theory of functional density (DFT) which is the latest theory to approximate the electronic band structure of a solid and allows us to characterize for the absorption stage, finding a strong hybridization of the orbital’s corresponding to the meta-stable states characterized by catching brightness curve of the studied materials, as well as a possible strong contribution of vibration bands with the energy necessary and sufficient for the release and subsequent transfer of electrons from unintentional impurities OH, confirmed experimentally by infrared spectroscopy studies and spectroscopic simulations performed.