Thermoluminescence, radioluminescence and cathodoluminescence spectra of alkali feldspars

Thermoluminescence (TL), radioluminescence (RL) and cathodoluminescence (CL) spectra are presented for a range of alkali feldspar samples. These show that the spectra ale complex, but contain a number of distinct emission bands. Intercomparison of the TL, RL and CL data for the ca 400 nm band shows that the peak wavelength may vary with type of stimulation. Activation energy data calculated over the temperature range 80-110 degrees C, which are sample dependent, indicate that the trapped charge population at 550 nm has a lower thermal stability than those associated with 290 and 400 nm centres. (C) 1997 Elsevier Science Ltd.