Abstract
The isothermal decay records of two TL peaks (peak I at 130°C and peak II at 280°C) of CaS : Bi phosphor samples (prepared with different Bi-dopant concentrations) have been analysed to determine the kinetic order parameter ( M) after irradiating them with a given UV dose. The value of M for both the peaks is found to be unity at a low dopant concentration of 0.012% (by weight of CaS). Further increase in the dopant concentration to 0.45% changes the M value from 1 to 2 for peak II, while for peak I, it remains unchanged. These measurements of kinetics and activation energy suggest that the Bi-impurity introduces two sets of trapping states whose density — profile shifts towards deeper states as the dopant concentration increases.
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