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Accurate count loss compensation is a prerequisite for k0-NAA at high incoming rates. The bottleneck with modern spectrometry set-ups is the charge collection time in the relatively big Ge crystals and its implications on the subsequent pulse shaping in classical amplifiers or, alternatively, the digital processing of the preamplifier output signal. Hence, pulse pileup is often the main count loss mechanism in the spectrometry chain.

Loss-free counting techniques are adequate tools to correct for any type of count loss, including leading edge pileup. In addition, they can deal with varying dead time by offering real time corrections. However, as the Poisson behavior of the counted events is destroyed, correction formulas have to be applied in order to take into account the corresponding over dispersion of the measure and. In this work, the assessment of the statistical counting uncertainty will be discussed for two loss-free counting techniques: the LFC based on the virtual pulse generator technique, and the so-called zero dead time technique with variance spectrum implemented on the DSPECplus. .

Additional information

Authors: POMMÉ S, JRC, IRMM, Geel (BE)
Bibliographic Reference: An oral report given at: The 3rd International k0-users workshop. Held in: Bruges (BE), 23-28 September 2001
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