Abstract
Thermoluminescence (TL) of the red-emission band obtained from natural muldan feldspar has shown two main peaks at around 160 and 270 °C, with thermal activation energies of 0.33 and 1.05 eV, respectively. The laboratory-induced TL peaks at 140 °C, 190 °C, 285 °C and 365 °C have thermal activation energies of 0.27, 0.45, 1.14 and 1.22 eV, respectively. The TL sensitivity of this band was enhanced to ∼10 times the original value when muldan was subject to pre-heating treatment at 1000 °C for 2 h. The TL fading effect was explained by tunneling recombination. The disordered aliquots showed no fading when post-irradiation annealed at 100 °C.