Characterization of CaWO 4 scintillator at room and liquid nitrogen temperatures
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.
- Publication:
-
Nuclear Instruments and Methods in Physics Research A
- Pub Date:
- November 2005
- DOI:
- 10.1016/j.nima.2005.07.052
- Bibcode:
- 2005NIMPA.553..578M