Scintillation response of CdWO_4 scintillator for gamma-ray detection

摘要

At present, scintillation materials are playing a major role in medical radiation detection. They are being used for various scans including CT scan, PET scan and SPECT scan. In this work, the researchers studied the scintillation response of the CdWO_4 (CWO) crystal compared with the Bi_4Ge_3O_(12) (BGO) crystal. The energy resolution and light yield values were tested using a photomultiplier tube (PMT) readout. The gamma source was aligned along the cylindrical axis of the crystal and the PMT. The energy spectra were then recorded using a PC-based multichannel analyser (MCA). From the results, it was found that the energy resolution of 6.5 % obtained from the CWO crystal was superior than that of 9.3 % obtained from the BGO crystal of 662 keV gamma-ray energy. The CWO crystal displayed about two times greater light yield than the BGO crystal. In the energy range from 32 keV to 1, 408 keV, the degree of the light yield non-proportionality of 0.13 obtained from the CWO crystal was also more exceptional than that of 0.19 obtained from the BGO crystal. The photo-fraction of both crystals was also discussed.