Thermoluminescence of undoped and Ce-doped BaB4O7

In this paper, the TL dosimetric characteristics of undoped and Ce-doped BaB4O7 compounds are reported. The polycrystalline powder samples were prepared by a melting method and the formation of the compounds were confirmed by an X-ray diffraction study. The TSL studies of undoped BaB4O7 sample show a prominent glow peak at 195 degrees C and three small peaks at 117, 255 and 365 degrees C whereas Ce-doped sample show three prominent TL glow peaks at 195, 250, 331 degrees C and two small peaks at around 90 and 135 degrees C when heated at a constant heating rate of 1 degrees C/s. Comparative TSL studies of these two compounds show that the Ce-doped BaB4O7 compound is approximately five times more sensitive than undoped compound. The TL emission spectra of Ce-doped showed a maxima at 360 nm for all measurements during TL measurements which is attributed to the characteristic emission from 5d to 4f transitions of Ce3+ ion. The main dosimetric characteristics, which are namely the TL dose response, TL sensitivity, fading, minimum detectable dose, reproducibility, precision of dose measurement and annealing procedure, were shown that Ce-doped BaB4O7 sample could be used in dosimetric applications, The trap parameters namely order of kinetics (b), activation energy (E) and frequency factor (s) associated with the glow peaks in beta-irradiated undoped and Ce-doped barium borate samples were also obtained by computer glow curve deconvolution (CGCD) method. (c) 2005 Elsevier B.V. All rights reserved.