AbstractResults on the thermoluminescence following incorporation of a wide range of dopant materials in calcium sulphide are reported. These results are compared with those previously reported in the literature. Factors such as fluxes and preparation technique are varied to determine their effect on the TL spectra. Conclusions regarding the possible source of the traps causing the TL in CaS are drawn with the evidence suggesting natural defects as the source of the traps; the added dopant impurities having only a secondary effect on the thermoluminescence peak temperatures.