Abstract
Thermoluminescence (TL) of X-ray irradiate natural kyanite (Al2SiO5) mineral annealed at 473, 573, 673 and 773 K was studied within 300–520 K. For all types of samples, TL glow curves revealed a stable peak at around 405 K. Analyzing the glow curves by computerized glow curve deconvolution process, one electron trap center had been estimated at depth around 1.01 eV from the conduction band. Investigation of TL emission spectra recorded within 300–520 K showed two intense peaks centered at around 366 and 688 nm, which confirmed the presence of two recombination centers at depth around 3.39 and 1.81 eV from the conduction band. Based on the analysis, a band diagram for kyanite crystal had been proposed showing the possible trap and recombination centers. Dose response, fading analysis and reproducibility measurement were carried out for all type of samples. For the highest annealed sample (773 K), linear dose response was observed within 15–1000 mGy. The rate of fading was very high just after irradiation but slowed after 5 days. The reproducibility of 773 K annealed sample was excellent. After ten recycle, the coefficient of variation was found to be only 0.75 %. These analyses demand the potential use of 773 K annealed kyanite as a natural X-ray dosimeter.
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Authors thank to UGC (University Grand Commission), New Delhi, for providing us the UGC major research project (Project No.: 42-910/2013 (SR)), DST (FIST) and ASTEC, Govt. of Assam (India) for giving instrumental facilities in the department to carry out this work.
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Kalita, J.M., Wary, G. Trap spectroscopy and dosimetric aspects of natural kyanite mineral. Appl. Phys. A 119, 1555–1560 (2015). https://doi.org/10.1007/s00339-015-9137-9
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DOI: https://doi.org/10.1007/s00339-015-9137-9