Abstract
The performances of a Silicon Drift Chamber (SDC), having a diameter of 3 mm, as scintillation light photodetector have been experimentally evaluated on a prototype of /spl gamma/-ray detector employing a GSO crystal of similar cross-section. This detector presents a minimum energy threshold of about 50 keV at room temperature (20/spl deg/C) or 25 keV at 0/spl deg/C. The measured energy resolution at room temperature is 22.65% and 8.73% FWHM at 122 keV and 662 keV respectively. These performances were obtained by using a shaping time of 0.5 /spl mu/s which allows to operate at high /spl gamma/-ray interaction rate. The effect of the SDC drift-time on the detector gain has been also evaluated.
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