The Effects of Long Term Storage on Lithium Drifted Silicon Detectors

The characteristics of four (4) lithium drifted silicon surface barrier detectors have been studied. Detector noise and leakage current were measured at the beginning and end of a sixteen (16) mounth interval. The thickness of the intrinsic region, at the beginning and end of a fourteen (14) month interval, was determined by use of proton beams from the University of Southern California Linac and the University of Colorado cyclotron. Detector noise measurements were made using both a standard pulser technique and the photopeak from Ba133 . The noise and leakage were measured at -54°C, +20°C aud +60°C. The detector leakage was measured as a function of bias at +20°C. The detector thickness measurements were also performed at +20°C