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Abstract
The change in TL response due to change in phosphor grain size, grinding time, ambient illumination levels, thickness of phosphor layer, annealing and irradiation temperatures of CaS: Bi has been studied. Thermoluminescence (TL) response has been found to increase with the decrease of grain size due to the generation of surface traps. However, after an initial increase, a gradual decrease in TL response has been observed with the increase in grinding time. Irradiation in the presence of fluorescent room light has been found to enhance the error in the dose measurements by 16%. Decrease in TL response when the phosphor is irradiated at elevated temperature has shown that trapping levels corresponding to two peaks behave independently. From these investigations optimised conditions for dose measurements have been concluded.