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Title: Thermoluminescence and photoluminescence properties of K2Ca2(SO4)3:Cu nanophosphor for gamma radiation dosimetry
Authors: Mandlik, Nandkumar
Bakare, J S
Sahare, P D
Bhoraskar, V N
Dhole, S D
Keywords: Nanophosphor;Thermoluminescence;Photoluminescence
Issue Date: Nov-2012
Publisher: NISCAIR-CSIR, India
Abstract: Nanocrytstalline K2Ca2(SO4)3:Cu was synthesized by chemical co-precipitation method and annealed at 400°C. These nanocrytstalline samples were irradiated with gamma radiation for the dose varying from 500 Gy to 2000 Gy. The pre and post irradiated samples were characterized by the techniques such as XRD, SEM, UV, FTIR, photoluminescence (PL) and thermoluminescence (TL). XRD spectra show the orthorhombic structure and the crystallite size ~ 25 nm. The same is also confirmed in SEM, where the size of nanoparticles was varied from 20 to 40 nm and also shows monodispersed. Formation of the compound was also checked by FTIR, where the S-O stretching and bending mode have been observed. Whereas, in case of UV visible spectra, the band gap observed to be marginally decreased with gamma dose. In PL spectra, the emission bands are observed at 403 and 419 nm, respectively and their respective intensity increases linearly with the increase in gamma dose. In TL spectra, two dosimetric peaks have been observed at 144°C and 287°C, respectively and their intensity tends to be increased with gamma radiation dose. This particular aspect shows the wide range linear TL response to the high gamma dose. Moreover, a significant shift in the peak towards lower temperature has been observed. This indicates the disorganization of the initial energy bands in the nanophosphor. In conclusion, the K2Ca2(SO4)3:Cu nanophosphor is useful for high dose gamma ray dosimetry.
Page(s): 859-862
ISSN: 0975-1041 (Online); 0019-5596 (Print)
Appears in Collections:IJPAP Vol.50(11) [November 2012]

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