X-ray induced thermoluminescence in CaSO4:Sm phosphors

The thermoluminescence (TL) of X-ray irradiated CaSO4: Sm phosphors, prepared in the laboratory with and without the addition of Na2SO4, has been studied in the temperature range of 300-600 K for a warming rate of 50 K min-1. CaSO4: Sm phosphors without charge compensator (Na2SO4) give two main glow peaks at 383 K and 503 K together with two unresolved shoulders at 410 K and 478 K. The general features of the glow curves are discussed. The addition of charge compensator (Na2SO4) in CaSO4 : Sm phosphors is found to influence the general features of glow curves. The conclusions are drawn regarding the possible role of charge compensator in thermoluminescence behaviour of CaSO4 : Sm phosphors. The values of activation energies have been estimated by various methods. An attempt has been made to find the type of kinetics involved in TL, process of CaSO4 : Sm (Na2SO4) phosphors. (auth.)