Effect of the heating rate on the red TL of quartz

Thermoluminescence (TL) glow curves were measured at a wavelength of 600 ± 40 nm for the rapidly bleaching peak (RBP, observed by Fleming (1979) at 325°C in the blue with a heating rate of 20 K/s) and the slowly bleaching peak (SBP, observed by Fleming (1979) at 375°C in the blue with a heating rate of 20 K/s) of quartz (grain size 90-125 μm) at heating rates from 10 to 0.01 K/s. Using plots of the peak temperature as a function of the heating rate, activation energies E (eV) and apparent pre-exponential factors s (s^-1) were: RBP: E = 1.65 ± 0.04 and s = 1.3 × 10¹³ (1 sigma limits: 0.6 × 10¹³ and 2.9 × 10¹³); SBP: E = 1.88 ± 0.03 and s = 4.8 × 10¹³ (1 sigma limits: 2.7 × 10¹³ and 8.4 × 10¹³). The "integrated intensities" (lightsums, or sums of counts above background across the peaks) of both peaks increased with decreasing heating rate, indicating a small amount of thermal quenching. The activation energies W (eV) for the thermal quenching were 0.14 ± 0.02 for the RBP and 0.21 ± 0.02 for the SBP. The red RBP appears to obey first order kinetics; the red SBP is more complicated.