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Year : 2011  |  Volume : 34  |  Issue : 1  |  Page : 32-33

Thermoluminescence studies of copper and indium doped Li 2 B 4 O 7 single crystals

1 Radiation Safety and Systems Division, BARC, Mumbai, India
2 Technical Physics Division, BARC, Mumbai, India

Correspondence Address:
M S Kulkarni
Radiation Safety and Systems Division, BARC, Mumbai
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Source of Support: None, Conflict of Interest: None

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Highly transparent single crystals of Li 2 B 4 O 7 i.e. lithium tetraborate (LTB) doped with Cu (0.25 wt. %) and Cu & In (0.5 wt. % each) were grown by the Czochralski method. The Li 2 B 4 O 7 : Cu and Li 2 B 4 O 7 :Cu, In crystals were studied using thermoluminescence (TL) technique. The TL readout of Li 2 B 4 O 7 :Cu crystals showed two well-defined glow peaks at 130 o C and 235 o C for heating rate of 4K/s, whereas in LTB:Cu, In another shoulder peak on low temperature side of the main peak is seen. The TL sensitivities of LTB:Cu and LTB:Cu, In were found to be 3.3 and 6 times to that of TLD-100 respectively. Both the LTB:Cu and LTB:Cu, In crystals exhibit a linear TL dose response in the dose range from 1 mGy to 1 kGy. The single crystal of Li 2 B 4 O 7 : Cu,In could become a potential TL phosphor for medical and clinical dosimetry owing to its very good sensitivity and excellent tissue equivalence.

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