Abstract
AbstractThermoluminescence (TL) of Pr‐doped KCI is studied. The influence of pre‐heat treatment and optical bleaching of the glow curves and the production of Z1 centers are discussed. The glow curves of KCI containing 1062 ppm of praseodymium (Pr) shows one shoulder at 365 K (T1) and two peaks around 408 K (T2) and 443 K (T3), respectively. Bleaching of X‐irradiated crystals shows that the peak T2 is enhanced whereas other two (T1, T3) get suppressed. Optical absorption studies of the crystals before and after F‐bleaching shows that the F‐band decreases and shifts towards longer wavelengths. The decrease is accompanied by broadening towards the longer wavelength. The T2 peak is attributed to Z1 centres. It is shown that T1 corresponds to shallow centers and T3 peak is attributed to F‐centers.
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