Thermoluminescence of X-ray irradiated NaCl and NaCl:Pb crystals

Abstract

Thermoluminescence of 'pure' and lead doped NaCl crystals obtained in the range of 300 to 600 K after room temperature irradiation with X-rays is reported. Three heating rates 40, 80 and 140 degrees C min-1 are employed in taking the glow curves. In the case of pure NaCl crystal three prominent peaks I1, F1 and F2 are observed. They are respectively attributed as due to the release of electrons from impurity centres (accidentally present), first and second stages of F centres. In the doped crystals four peaks L1, L2, F1 and F2 are observed. The first two are attributed to the release of electrons from Pb+ and Pb0 centres in the crystal formed during irradiation. F1 and F2 are due to the bleaching and recombination of F centre electrons as in the pure crystal.