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 30.12.2010   Карта сайта     Language По-русски По-английски
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30.12.2010

Argon ions induced thermoluminescence properties of Ba0.12Sr0.88SO4 phosphor





A. Choubeya, Corresponding Author Contact Information, E-mail The Corresponding Author, S.K. Sharmaa, S.P. Lochabb and D. Kanjilalb






a Department of Applied Physics, Indian School of Mines, Dhanbad-826 004, India


b Inter-University Accelerator Center, New Delhi-110 067, India





Received 27 August 2010; 


revised 4 November 2010; 


accepted 3 December 2010. 


Available online 10 December 2010.









Abstract



Thermoluminescence properties of barium strontium mixed sulfate have been studied by irradiation with Argon ions. The sample was recrystallized by chemical co-precipitation techniques using H2SO4. The X-ray diffraction study of prepared sample suggests the orthorhombic structure with average grain size of 60 nm. The samples were irradiated with 1.2 MeV Argon ions at fluences varying between 1011 and 1015 ions/cm2. The argon ions penetrate to the depth of 1.89 μm and lose their energy mainly via electronic stopping. Due to ion irradiation, a large number of defects in the sample are formed. Thermally stimulated luminescence (TSL) glow curves of ion irradiated Ba0.12Sr0.88SO4 phosphor exhibit broad peak with maximum intensity at 495 K composed of four overlapping peaks. This indicates that different sets of traps are being activated within the particular temperature range each with its own value of activation energy (E) and frequency factor (s). Thermoluminescence (TL) glow curves were recorded for each of the ion fluences. A linear increase in intensity of TL glow peaks was found with the increase in ion dose from 59 kGy to 5.9 MGy. The kinetic parameters associated with the prominent glow peaks were calculated using glow curve deconvolution (GCD), different glow curve shape and sample heating rate methods.









Research highlights



► Effect of Argon ion irradiation on thermoluminescence (TL) property of Ba0.12Sr0.88SO4 phosphor. ► Monte Carlo SRIM-2008 simulation to correlate defect evolution by ion irradiation with the change in TL properties. ► GlowFit computer program was used for glow curve analysis. ► Kinetic parameters associated with the prominent glow peaks were calculated using glow curve deconvolution (GCD), different glow curve shape and sample heating rate methods.





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