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| Field | Value |
| Title | Defect centres and thermoluminescence in CaSO4 : Dy, Ag phosphor |
| Names |
BHATT, BC
(author) DHABEKAR, B (author) KUMAR, R (author) RAO, TKG (author) LAKSHMANAN, AR (author) |
| 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 | 0144-8420 |
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