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Abstract
Thermoluminescence and electron paramagnetic resonance (EPR) of CaSO4(Mn) powder have been studied. The intensities of the hyperfine lines in the EPR spectra of Mn++ and the heights of the thermoluminescence glow peak are found to change in parallel, upon varying the conditions of heat treatment and the concentration of Mn++. It is also found that Mn++ present in aggregate state, which gives a broad EPR spectrum, is not an effective activator for thermoluminescence; heat treatment at high temperatures serves to disperse this aggregated Mn++, which increases the thermoluminescence sensitivity. The relation between the thermoluminescence intensity and the radiation dose is linear, so long as the duration of irradiation is within certain limits; the deviation from the linear relation is explained in terms of fading of thermoluminescence at the temperature of irradiation.