470030 Thermoluminescent Dosimetric Analysis of Ag and Cu Doped LiB3O5

Thursday, November 17, 2016: 1:06 PM
Golden Gate 8 (Hilton San Francisco Union Square)
Senthil Kumar1,2, Swarnapriya Thiyagarajan1, Miguel Vallejo1, Juan Azorin1, Esteban Rivera1, Ricardo Navarro1, Boobalan Kasilingam3, Luis Diaz-Torres4, Jayaramakrishnan Velusamy5 and Modesto Sosa1, (1)University of Guanajuato, Leon, Mexico, (2)Vel Tech University, Avadi, Chennai, India, (3)Excel Engineering College, Namakkal, India, (4)Centro de Investigaciones en Optica, Leon, Mexico, (5)Centro de Investigaciones en Optica, Leon, Mexico

Methods

Production

Synthesis of Ag and Cu doped LiB3Ocrystals was carried out by precipitation, using water as a solvent. Impure crystals were produced at a synthesis temperature of 70 oC. A 5g of Ag and Cu doped LiB3O5 precipitate was obtained upon evaporation of water in the solution. The precipitates were calcined at a temperature of 750 oC for one hour. The calcined materials were grounded finely and subjected to severalcharacterizations.

Characterization

SEM analyses were performed for the doped and undoped samples of LiB3O5. The XRD properties of the samples were obtained. The UV-Vis absorbance spectra of the samples were obtained at room temperature. Spectra were recorded between 200 and 1200 nm. The photoluminescence (PL) measurements were carried out. The glow curves of the samples has been obtained using TLD reader.

Results

The XRD patterns obtained for the samples showedthat production of LiB3Owith orthorhombic structure was successful since allof the main peaks of LiB3O5 coincide with the JCPDS data. It was seen that the dopant added did not interfere withthe crystal structure. As it can easily be detected addition of the dopants didnot have any significant effect on the crystal structure of LiB3Oproduced.

SEM was carried out to check the morphologies of the samples.According to the SEM images, the samples produced by the co-precipitation method shows the agglomerated surface.

The UV-Vis absorption spectra for the samples showed that the maximum absorbance was observed at 250nm. The result showed that a clear monotonic and increasing dependence of the intensity of the absorbance as a function of dopants.

The dosimetric properties of LiB3O5 doped with Ag and Cu were determined by using HarshawTLD Reader Model 3500. The heating rate was chosen as 10oC/s was usedfrom 50 to 350oC. The examined dosimeters were exposed to X-rays at room temperature. The sample amount was 0.5g. The samples have shown the TL response. The pattern of the glow curves changed with the change of dopants.

Conclusions

The TL response of LiB3O5 has been compared with the commercial TLD100. The observation concludes that the doped LiB3O5 has the TL behavior. The glow curves of the LiB3Oshows different shape with the change of dopants.


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