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Please use this identifier to cite or link to this item: http://dspace.library.iitb.ac.in/jspui/handle/100/1510

Title: Defect centres and thermoluminescence in CaSO4 : Dy, Ag phosphor
Authors: BHATT, BC
DHABEKAR, B
KUMAR, R
RAO, TKG
LAKSHMANAN, AR
Keywords: electron-spin-resonance
single-crystals
mechanisms
caso4
Issue Date: 2006
Publisher: OXFORD UNIV PRESS
Citation: RADIATION PROTECTION DOSIMETRY,119,53-56
Abstract: The defect centres formed in the TL phosphor CaSO4:Dy,Ag are studied using the technique of Electron Spin Resonance. The Ag co-doped phosphor exhibits three glow peaks around 130, 220 and 375 degrees C in contrast with the two glow peaks observed in the CaSO4:Dy phosphor at 130 and 220 degrees C at a gamma ray dose of 1Gy. ESR studies show that the additional peak at 375 degrees C correlates with a Ag2+ centre formed due to gamma irradiation and observable only below -170 degrees C. The Ag2+ centre is characterised by an axial g-tensor with principal values g(parallel to) = 2.38 and g(perpendicular to) = 2.41. ESR studies further indicate that the precursor to a centre observable at low temperature (-170 degrees C) appears to act as the recombination centre for the TL peak at 375 degrees C; this radical is characterised by the g-values g(parallel to) = 2.0023 and g(perpendicular to) = 2.0038 and is assigned to SO3- radical. It is observed that there is more incorporation of Ag in the CaSO4:Dy system as compared with that in pure CaSO4 system.
URI: http://dx.doi.org/10.1093/rpd/nci639
http://dspace.library.iitb.ac.in/xmlui/handle/10054/14928
http://hdl.handle.net/100/1510
ISSN: 0144-8420
Appears in Collections:Proceedings papers

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