Abstract
The properties of CaWO 4 (CaWO) crystals in γ-spectrometry were studied at room and liquid nitrogen(LN 2) temperatures. Two small samples of 10×10×4 mm 3 and 10×10×8 mm 3 size were tested, coupled to a Photonis XP3212 photomultiplier at room temperature and a large area avalanche photodiode at LN 2 temperature. Light pulse shape and light output at room and LN 2 temperatures were measured. Energy resolution and non-proportionality of the CaWO response versus γ-ray energy were studied and compared with those of small BGO and CdWO 4 crystals to discuss further the origin of the intrinsic resolution of undoped scintillating crystals. A high light output of 4800±200 phe/MeV and a good energy resolution of 6.6±0.2% for 662 keV γ-rays from a 137Cs source were measured for the small samples coupled to the XP3212 photomultiplier.
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