Abstract
A high resolution spectrometer system which contains optoelectronic charge restoration at the detector, direct coupled signal amplification, active signal filters and a versatile analogue-to-digital converter is briefly described. The performance of this system with semiconductor gamma ray and X-ray detectors, scintillation counters and proportional counters over a very wide range of counting rates is described. Owing to the unique characteristics of this spectrometer the performance with every detector tested is believed to be substantially better than that hitherto reported for any other spectrometer. It is shown that the overall performance is limited solely by noise at the input and by detector characteristics even with the best available detector.
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