Lithium tetraborate has been used to measure ionizing radiations for thermoluminescence dosimetry for long time. Lithium tetraborate has the effective atomic number Zeff = 7.25 which is very close to soft biological tissue value (7.42). Hence, tissue equivalency makes lithium tetraborate as candidate for personal and medical dosimetry purposes compared to phosphor that does not have tissue equivalency. Lithium tetraborate which has been synthesized and doped with Cu, Ag transition metals using solution-assisted method and thermoluminescence characteristics of synthesized lithium tetraborate were analyzed. Synthesized Li2B4O7: Cu, Ag phosphors were characterized with X-ray Diffraction, Infrared Spoectroscopy, Scanning Electron Microscopy, and Differential Thermal Analysis to determine structural and morphological properties. Thermoluminescence (TL) properties of the lithium tetraborate samples, doped with varied amounts of copper in the range 0.02 wt% - 0.1 wt% and constant amount of silver (0.04 wt%), were studied. TL results demonstrate that 0.08% Cu and 0.04% Ag doped lithium tetraborate synthesized with solution-assisted method has the highest dosimetric sensitivity. Kinetic parameters (trap depth and order of kinetic) of this sample were calculated using peak shape, variable heating rate and computer glow curve deconvolution methods.

Synthesis and thermoluminescence characterization of copper and silver co-doped lithium tetraborate phosphors

256th National Meeting (2018)

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