Inderscience Publishers

Development of sintered composites of CaSO4 doped with Dy and Nd

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The main purpose of this work is the development of sintered composites in order to allow their use as thermoluminescence (TL) dosimeters using a simple route to preparation and employing high temperature. The composites were prepared with CaSO4.2H2O doped with Dy2O3 and NdO3. Initially, CaSO4.2H2O was dehydrated in an oven at 100°C for 1 h. After addition of dopants and homogenisation, Polyvinyl Alcohol (PVA) was incorporated into the compounds to make their compaction easier. The pellets, 6 mm in diameter and 1 mm thick, were sintered at 900°C and 1000°C for 6 h. The TL emission curves showed two peaks when the samples were irradiated with a beta source (90Sr + 90Y). During calibration, TL responses were found to be proportional to the absorbed dose. The results showed that this material can potentially be used in dosimetry.

Keywords: thermoluminescent dosimeters, emission, pellets, dopants, sintered composites, dosimetry

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