470030 Thermoluminescent Dosimetric Analysis of Ag and Cu Doped LiB3O5
Synthesis of Ag and Cu doped LiB3O5 crystals 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.
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.
The XRD patterns obtained for the samples showedthat production of LiB3O5 with 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 LiB3O5 produced.
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.
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 LiB3O5 shows different shape with the change of dopants.
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