The XRD and SEM and TSL studies of the as prepared pure, Cu and Mn doped CaSO4 have been carried out. From the comparative TSL studies it has been seen that the 137 degrees C glow peak of CaSO4:Cu is superior to undoped and Mn doped CaSO4 compounds as well as other Cu doped alkaline earth sulphates. Evaluation of trapping parameters of the most intensive glow peak Cu (0.5 mol%) doped CaSO4 is accomplished by a technique named isothermal luminescence decay method and comparison of these parameters with the previously calculated trapping parameters by glow curve shape method (Chen's method) have been done. it is observed that the most intensive glow peak of Cu doped CaSO4 is found to obey second order kinetics, because of availability of vacant traps for retrapping to take place. Moreover the effect of various doping concentration of Cu on the TSL glow Curve and reproducibility of Cu doped CaSO4 has also studied. (C) 2009 Elsevier B.V. All Fights reserved.