Abstract
The results of thermoluminescence (TL) emission and excitation spectra for CaSO 4 :Dy and CaSO 4 :Tm are presented. TL emission as a function of temperature verifies that the lattice defect and Dy 3+ (Tm 3+ ) emissions possess the same peak temperature. Excitation spectra establish the presence of a 'spectral overlap' between Dy 3+ (Tm 3 ) absorption and lattice defect emission in the 340-360 nm range. The excitation spectrum is observed initially to increase and then decay over the temperature range corresponding to the production of TL. Over this same temperature range, a lattice-related- broad-band structure emerges corresponding to the creation of centres which are capable of transferring energy to Dy 3+ (Tm 3+ ) ions. Laser stimulation at 266 and 532 nm produces optically stimulated luminescence (OSL) in CaSO 4 :Dy. The production of OSL by 266 and 532 nm stimulation is shown to cause a reduction in the TL glow curve.
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