Electron paramagnetic resonance and the thermoluminescence emission mechanism of the 280 °C peak in natural andalusite crystal

► TL and EPR spectra have been measured in natural andalusite crystals. ► Andalusite irradiated with different γ-doses shows TL peaks at 150, 210, 280 and 350 °C. ► The EPR spectra show lines due to Fe3+ ions and due to the [TiO4/Na+]0 center.