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Radiation Protection Dosimetry Advance Access originally published online on May 18, 2006
Radiation Protection Dosimetry 2006 119(1-4):53-56; doi:10.1093/rpd/nci639
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Defect centres and thermoluminescence in CaSO4:Dy,Ag phosphor

B. C. Bhatt1,*, Bhushan Dhabekar1, Rajesh Kumar1, T. K. Gundu Rao2 and A. R. Lakshmanan3

1 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400 085, India
2 Regional Sophisticated Instrumentation Centre, IIT, Powai, Mumbai 400 076, India
3 Health and Safety Division, Indira Gandhi Centre for Atomic Research, Kalpakkam 603102, India

* Corresponding author: bcbhatt2003{at}yahoo.com

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°C in contrast with the two glow peaks observed in the CaSO4:Dy phosphor at 130 and 220°C at a gamma ray dose of 1Gy. ESR studies show that the additional peak at 375°C correlates with a Ag2+ centre formed due to gamma irradiation and observable only below –170°C. The Ag2+ centre is characterised by an axial g-tensor with principal values g|| = 2.38 and g{perp} = 2.41. ESR studies further indicate that the precursor to a centre observable at low temperature (–170°C) appears to act as the recombination centre for the TL peak at 375°C; this radical is characterised by the g-values g|| = 2.0023 and g{perp} = 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.


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