Development of high sensitive LiNaSO4:Cu,Mg phosphor for TLdosimetry

Abstract

LiNaSO4:Cu and LiNaSO4:Cu,Mg low Z phosphors (Zeff=11.59) are synthesized by wet chemical route and exposed to γ-rays of 60Co for their thermoluminescence (TL) study. The XRD technique showed the crystalline nature of the prepared material. Photoluminescence studies have been undertaken to ensure the successful incorporation of Cu and Mg impurities in LiNaSO4 host lattice. The induced TL glow curves of LiNaSO4:Cu and LiNaSO4:Cu,Mg samples are found at 166°C and 160°C with single peak respectively. The TL intensity was found to be enhanced nearly two times by co-doping of Mg in LiNaSO4:Cu. The prepared phosphors have a linear response, less fading and excellent reusability. The whole glow curve displays a good stability under storage at room temperature. Comparison of TL intensity of the most intensive glow peak of LiNaSO4:Cu,Mg with that of standard TLD CaSO4:Dy shows that their intensities are almost equal. The trap parameters namely order of kinetics (b), activation energy (E), frequency factor (s) and Balarin parameter (γ) associated with the most intensive glow peak, i.e. 160°C glow peak of LiNaSO4:Cu phosphors were determined by using glow curve shape (Chen's) method. The deconvolution of the glow curve was done by using computerized glow curve deconvolution (CGCD) technique.