Some thermoluminescence parameters of blue–green emission band of pegmatite rock

Abstract

The thermoluminescence glow curve of natural pegmatite has a broad band with two peaks at 255 and 270 °C in the blue- green emission region. The initial rise measurements indicate that these peaks have thermal activation energies of 1.056 and 1.086 eV respectively. The laboratory-induced peaks at 110, 140, 185, 240, 255 and 270 °C have thermal activation energies of 0.77, 0.83, 0.92, 1.026, 1.056 and 1.086 eV, respectively. The pre-heat treatment at 1,000 °C for 2 h and air-cooling enhances the TL sensitivity of pegmatite by up to ~6 times of that treated at 400 °C. Thermoluminescence fading of the storage pegmatite has been monitored after storage in the dark at room temperature for 8 days. The properties of fading are well explained with the tunneling model. The results show that pegmatite is a promising material for dosimetry and luminescence dating.