Title :
Investigation of GSO, LSO and YSO scintillators using reverse avalanche photodiodes
Author :
Lecomte, W. ; Pepin, C. ; Rouleau, D. ; Saoudi, A. ; Andreaco, M.S. ; Casey, M. ; Nutt, R. ; Dautet, H. ; Webb, P.P.
Author_Institution :
Dept. of Nucl. Med. & Radiobiol., Sherbrooke Univ., Que., Canada
fDate :
6/1/1998 12:00:00 AM
Abstract :
The performance characteristics of GSO, LSO and YSO scintillators coupled to new “reverse” avalanche photodiodes (ReAPD) were investigated and compared to those of BGO. The energy and timing resolutions were measured as a function of photodiode bias and amplifier shaping time constant. While the performance of BGO and GSO is critically dependent on these operating parameters because the signal-to-noise ratio is degraded by the dark and excess noise from the ReAPD, that of the high-luminosity LSO and YSO scintillators is not. The energy resolution in these crystals is demonstrated to be limited by the scintillator resolution. Further analysis indicates that excess variance in the number of photons generated in the crystal is mostly responsible for their disappointing energy resolution. This feature appears to be related to the important non-linearity in scintillation response as a function of incident gamma-ray energy observed for these high-luminosity scintillators
Keywords :
avalanche photodiodes; gadolinium compounds; gamma-ray detection; lutetium compounds; solid scintillation detectors; yttrium compounds; GSO scintillators; Gd2(SiO4)O:Ce; LSO scintillators; Lu2(SiO4)O:Ce; Y2(SiO4)O:Ce; YSO scintillators; amplifier shaping time constant; energy resolutions; high-luminosity scintillators; incident gamma-ray energy; photodiode bias; reverse avalanche photodiodes; scintillation response; scintillator resolution; signal-to-noise ratio; timing resolutions; Avalanche photodiodes; Degradation; Energy measurement; Energy resolution; Noise shaping; Photonic crystals; Signal resolution; Signal to noise ratio; Time measurement; Timing;
Journal_Title :
Nuclear Science, IEEE Transactions on
