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Amplifier with time-invariant trapezoidal shaping and shape-sensitive pileup rejector for high-rate spectroscopy

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3 Author(s)
V. Drndarevic ; Boris Kidric Inst. of Nucl. Sci., Belgrade, Yugoslavia ; P. Ryge ; T. Gozani

An amplifier with trapezoidal pulse shaping was developed for high-rate high-energy gamma spectroscopy using NaI(Tl) scintillation detectors. It used a double-delay-line technique for producing a nearly triangular pulse shape combined with a linear circuit for producing a flat-topped pulse. Good energy resolution and short resolution time make this amplifier especially suitable for high-count-rate gamma-ray spectroscopy. To provide a versatile high-performance system, it includes a pileup rejector based on inspection of a pileup signal obtained by combining the slow output signal and fast-shaped input signal. The trapezoidal shape provides a short resolution time for minimal occurrence of pileup with a width suitable for presentation to a standard multichannel analyzer. The performance of the system was tested, and the results are presented.

Published in:

IEEE Transactions on Nuclear Science  (Volume:36 ,  Issue: 1 )