Abstract
A thermally stimulated exoelectron emission (TSEE) measuring system developed and constructed at IPEN was used to verify the feasibility of the use of sintered pellets made of pure calcium sulphate (CaSO4) or CaSO4 with a 10% graphite content, for area monitoring of an electron accelerator with variable energy. Its counting system consists of a 2p windowless gas flow proportional counter, and the heating system is formed by a temperature programmer that provides linear heating of the samples. The dosimetric characteristics of the samples, such as TSEE glow curve, response reproducibility, calibration curves and energy dependence were studied using the secondary standard system of beta sources from the Calibration Laboratory of IPEN. Measurements of TSEE response as a function of the absorbed dose were taken, placing these samples in different positions in the accelerator's irradiation room. The obtained results show the usefulness of these materials for area monitoring.
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