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 Posted: Tue May 06, 2008 6:48 am |
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Photoluminescence and thermoluminescence properties of tricalcium
phosphate phosphors doped with dysprosium and europium
K. Madhukumar1 , H. K. Varma1, 2, Manoj Komath1, 2, T. S. Elias1, 3,
V. Padmanabhan1, 3 and C. M. K. Nair1
(1) Department of Physics, Mahatma Gandhi College,
Thiruvananthapuram, 695 004, India
(2) Sree Chitra Tirunal Institute for Medical Sciences and
Technology, Thiruvananthapuram, 695 012, India
(3) Regional Cancer Centre, Thiruvananthapuram, 695 011, India
Received: 8 March 2007 Revised: 18 July 2007 Published online: 21
November 2007
Abstract
The suitability of calcium phosphate crystals for thermoluminescence
dosimetry (TLD) applications is investigated, owing to their
equivalence to bone mineral.
The á and â phases of tricalcium phosphate (TCP) were synthesized
through wet precipitation and high temperature solid state routes and
doped with Dy and Eu.
The photoluminescence and thermoluminescence studies of the phosphors
have been carried out.
The TL properties were found to be highly dependent on the method of
preparation of the material.
Eu doping gave good PL emission, whereas Dy doping was more efficient
in TL emission. â-TCP was found to be less TL sensitive than á-TCP,
yet it was identified as a better phosphor material owing to its
better fading characteristics.
The dependence of TL of â-TCP: Dy on the energy and dose of radiation,
and on the doping concentration were studied.
The TL intensity was observed to fade exponentially during a storage
period of 20 days, but it stabilized at 70% of the initial value after
30 days.
The optimum doping concentration was found to be 0.5 mol%.
Keywords Photoluminescence - thermoluminescence - radiation
dosimetry
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K. Madhukumar
Email: madhusandh at (no spam) yahoo.co.in
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