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Radiation Protection Dosimetry Advance Access originally published online on April 27, 2006
Radiation Protection Dosimetry 2006 119(1-4):139-142; doi:10.1093/rpd/nci561
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© The Author 2006. Published by Oxford University Press. All rights reserved. For Permissions, please email: journals.permissions@oxfordjournals.org

Correlation of phase transition with the change in TL characteristics in CaSO4:Dy phosphor—effect of thermal treatment

A. K. Bakshi1,*, A. S. Pradhan2, A. K. Tyagi3, R. K. Kher1 and B. C. Bhatt1

1 Radiological Physics and Advisory Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
2 Internal Dosimetry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India
3 Applied Chemistry Division, Bhabha Atomic Research Centre, Mumbai 400 085, India

* Corresponding author: akbakshi123{at}yahoo.com

The study is aimed at optimising the glow curve structure of CaSO4:Dy phosphor for dosimetric purpose and also to understand the observed changes owing to thermal treatment in the thermoluminescence (TL) sensitivity and glow curve structure. The reversible changes in the intensities of the lower temperature satellite peak and the main dosimetric glow peak with temperature of thermal treatment in the temperature range 400–700°C indicates the interconversion of defect complexes responsible for the glow peaks in CaSO4:Dy. Phosphor samples subjected to thermal treatment in temperature range beyond 800°C, showed irreversible changes in the intensities of the lower temperature and dosimetric peaks. The changes in TL characteristics of the phosphor for thermal treatments >800°C are attributed to the partial phase transition in the phosphor as confirmed by the XRD and TG/DTA analysis of the phosphor.


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