Effect of thermal annealing on the thermoluminescent properties of nano-calcium fluoride and its dose–response characteristics. Issue 4 (13th November 2014)

• Record Type: Journal Article
• Authors: Mundupuzhakal, J. K.; Biswas, R. H.; Chauhan, S.; Varma, V.; Acharya, Y. B.; Chakrabarty, B. S.
• Is Part Of: Radiation protection dosimetry. Volume 167:Issue 4(2015)
• Page Start: 419
• Page End: 424
• Publication Date: 2014-11-13
• Subjects: Radiation dosimetry -- Periodicals; Radiation -- Safety measures -- Periodicals; 363.1799
• DOI: 10.1093/rpd/ncu333
• Languages: English
• ISSNs: 0144-8420

Abstract

Abstract: Nano-CaF2, prepared by the co-precipitation method, was annealed under different annealing conditions to improve its thermoluminescence (TL) characteristics. Different annealing parameters, such as temperature (400–700°C), duration (1–4 h) and environment (vacuum and air), were explored. The effect on TL sensitivity, peak position ( T m ) and full-width at half-maximum (FWHM) with respect to the different annealing conditions are discussed as they are the measure of crystallinity of the material. Annealing temperature of 500°C with annealing duration of two and a half hours in vacuum provided the highest luminescence response (i.e. maximum sensitivity, minimum peak temperature and FWHM). Wide detectable dose range (5 mGy to 2 kGy), absence of thermal quenching and sufficient activation energy (1.04 eV) of this phosphor make it suitable for dosimetric applications.