Abstract
Trapezoidal pulse shaping by a digital technique from nuclear spectrometry preamplifier output is reported. The shaping is especially suitable for time and/or pulse-height spectra measurements from high counting rate sources which commonly implies pulse pile up. In fact, piled up events may be identified and measured rather than rejected as in usual analog systems. Moreover, the amplitude-arrival time measurement of piled up pulses by the trapezoidal shape is simpler than by both maximum likelihood and least squares estimators, or adaptive nonlinear least squares methods which give better results in the case of severe pile up. Comparison with different techniques currently used in fast scanners for nuclear medicine studies is given. The technique utility in high energy semiconductor gamma ray spectrometry is also discussed.
Published Version
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