Effect of thermal annealing on the thermoluminescent properties of nano-calcium fluoride and its dose-response characteristics

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...

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Bibliographic Details
Published in:Radiation protection dosimetry 2015-12, Vol.167 (4), p.419-424
Main Authors: Mundupuzhakal, J K, Biswas, R H, Chauhan, S, Varma, V, Acharya, Y B, Chakrabarty, B S
Format: Article
Language:English
Subjects:
Calcium Fluoride - chemistry
Dose-Response Relationship, Drug
Luminescence
Nanostructures - chemistry
Temperature
Thermoluminescent Dosimetry - methods
X-Ray Diffraction
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Summary: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 (Tm) 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.
ISSN:0144-8420
1742-3406
DOI:10.1093/rpd/ncu333