Properties of the model for radiation induced optically stimulated luminescence (OSL) in sodium and potassium chlorides

The complex kinetics of optically stimulated luminescence (OSL) in certain salts is associated with the effect of regeneration (RE). Until now, the RE effect was found in sodium and potassium chlorides (NaCl, KCl). The model of OSL kinetics explaining regeneration and fading was previously proposed in pure NaCl. However, it can be referred also to other materials. Verification of the model was performed based on the experimental results obtained for halite (rock salt mineral) and pure KCl crystals. Determination of the characteristic lifetimes of regeneration and fading was performed by adjusting the model solutions for a special case (without stimulation) to the data obtained from the VD-OSL method. In the case when stimulation is on during OSL readout, differential equations describing the model have no analytical solution. Therefore in order to model OSL decays the numerical simulations for various parameters were carried out. The obtained theoretical OSL decays are compatible with the measurement data.