Features

• Low noise design: better than 600 eV (Ge) at Cs = 0 pF
• Fast rise time: better than 20 ns at Cs = 0 to 30 pF
• Count rate capability >200 000 counts/s (60Co)
• Count rate overrange indicator
• Detector bias filter rated to ±5000 V dc
• Separately terminated energy and timing outputs
• Diode protected FET Input

Description

The CANBERRA Model 2002 is a low noise, high speed preamplifier designed for high resolution gamma spectroscopy and timing measurements using cooled Ge semiconductor detectors. The preamplifier converts the ionization charge developed in the detector during each absorbed nuclear event to an output pulse whose amplitude is proportional to the total charge accumulated in that event. The pulse decays exponentially with a time constant of 50 µs (nominal) to segregate successive events in high count rate applications.The preamplifier includes a low noise FET input circuit optimized for the ultra-high source impedance of germanium detectors. The charge amplifier and buffer stages have been designed for both the low noise and high speed performance needed for precise energy and timing spectroscopy. In addition, a special circuit monitors the activity of the detector, and warns when improper operating conditions exist. A high voltage filter insures a noise-free power source for the detector.