A new pulse height analysis system based on fast ADC digitizing technique

摘要

A fast digitizing system was used as a pulse height analysis system in nuclear spectroscopy. Input signals were processed by a computerized data processing system consisting of a fast ADC (analog-to-digital converter) of 200 MHz/10 b and a UNIX workstation without any shaping circuit. Measurements have been made with a HPGe detector and a /sup 60/Co gamma -ray source. An energy resolution of 1.7 keV was obtained in this system whereas it was 2.0 keV in the conventional system with a shaping circuit with a 6- mu s time constant. A digital analysis of the pulse waveform has been performed. The selection of convex waveform gives an improved peak to Compton ratio. This technique has the potential to analyze individual signals with required accuracies and to be used as an advanced signal processing method.