Record Details


Field	Value

Title	Defect centres and thermoluminescence in CaSO4 : Dy, Ag phosphor

Names	BHATT, BC DHABEKAR, B KUMAR, R RAO, TKG LAKSHMANAN, AR
Date Issued	2006 (iso8601)
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.
Genre	Article; Proceedings Paper
Topic	Electron-Spin-Resonance
Identifier	RADIATION PROTECTION DOSIMETRY,119,53-56

ICAR Research Data Repository for Knowledge Management