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Title: Luminescence studies in KMgF<sub>3</sub>:Eu,Ag
Authors: Madhusoodanan, U
Jose, M T
Indira, R
Rao, T K Gundu
Keywords: Alkali halides
Electron spin resonance
Radiation dosimetry
Issue Date: Jun-2009
Publisher: CSIR
Abstract: A new sensitive material KMgF<sub>3</sub>:Eu,Ag<sub> </sub>has been developed with double dopants europium (Eu) and silver (Ag) by melting equal molecular proportions of KF and MgF<sub>2</sub><sup> </sup>along with dopants (0.2 mol % each) in argon atmosphere. Luminescence studies have been carried out in this material to check its possible use in radiation dosimetry applications. Thermoluminescence (TL) studies in this material show that its TL sensitivity is three times that of the existing tissue equivalent material LiF:Mg,Ti (TLD-100), while KMgF<sub>3</sub> doped with Eu alone and Ag alone shows sensitivities equal to that of TLD-100. KMgF<sub>3</sub>:Eu,Ag shows a major TL peak around 240<sup>o</sup>C<sub> </sub>unlike TLD-100 which has a complicated glow curve shape. The TL emission spectra of gamma irradiated material show characteristic emission of Eu<sup>2+</sup>. Compared to KMgF<sub>3</sub>:Eu, the emission intensity of Eu has been found more in KMgF<sub>3</sub>:Eu,Ag. Photoluminescence studies show that there is no conversion of Eu<sup>2+</sup>to Eu<sup>3+</sup> on gamma irradiation. Electron spin resonance (ESR) studies have been carried out in this material to check if there is any valance conversion of Eu and Ag. Both the irradiated as well as unirradiated materials show signal for Eu<sup>2+</sup> ion and did not show any signal for Ag<sup>2+ </sup>ion. Hence, in the presence of Ag<sup>+</sup> more Eu<sup>2+ </sup>is entering into the crystal lattice which enhances the luminescence efficiency.
Description: 459-460
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.47(06) [June 2009]

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