Defect centres and thermoluminescence in CaSO4:Dy,Ag phosphor.
Radiat Prot Dosimetry
; 119(1-4): 53-6, 2006.
Article
em En
| MEDLINE
| ID: mdl-16709708
ABSTRACT
The defect centres formed in the TL phosphor CaSO4Dy,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 CaSO4Dy 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) = 2.38 and g(perpendicular) = 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) = 2.0023 and g(perpendicular) = 2.0038 and is assigned to SO3- radical. It is observed that there is more incorporation of Ag in the CaSO4Dy system as compared with that in pure CaSO4 system.
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Base de dados:
MEDLINE
Assunto principal:
Dosimetria Termoluminescente
/
Sulfato de Cálcio
/
Artefatos
/
Modelos Teóricos
Tipo de estudo:
Diagnostic_studies
/
Prognostic_studies
Idioma:
En
Ano de publicação:
2006
Tipo de documento:
Article