The material used by LANDAUER for this technology is lithium fluoride, LiF.
Like the OSL, the ThermoLuminescence Dosimetry (TLD) technology is based on the principle of detecting light emission following stimulation of the irradiated material. For TLD, the stimulation is achieved by heating the dosimeter.
Unlike OSL, in which very little of the trapped charge is stimulated, thermally stimulating the material empties most of the rapped charge. They cannot generally be re-read with accuracy.