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Digital pulse processing and optimization of the front-end electronics for nuclear instrumentation

C. Bobin 1 J. Bouchard 1 C. Thiam 1 Y. Ménesguen 1 
1 LNHB - Laboratoire National Henri Becquerel
DM2I - Département Métrologie Instrumentation & Information : DRT/LIST/DM2I
Abstract : This article describes an algorithm developed for the digital processing of signals provided by a high efficiency well-type NaI(Tl) detector used to apply the 4$\pi \gamma$ technique. In order to achieve a low-energy threshold, a new front-end electronics has been specifically designed to optimize the coupling to an analog-to-digital converter (14 bit, 125 MHz) connected to a digital development kit produced by Altera (c) . The digital pulse processing is based on an IIR (Infinite Impulse Response) approximation of the Gaussian filter (and its derivatives) that can be applied to the real-time processing of digitized signals. Based on measurements obtained with the photon emissions generated by an $^{241}$Am source, the energy threshold is estimated to be equal to ~2 keV corresponding to the physical threshold of the NaI (Tl) detector. An algorithm developed for a Silicon Drift Detector used for low-energy x-ray spectrometry is also described. In that case, the digital pulse processing is specifically designed for signals provided by a reset-type preamplifier (${55}$Fe source).
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Submitted on : Tuesday, July 3, 2018 - 10:46:31 AM
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C. Bobin, J. Bouchard, C. Thiam, Y. Ménesguen. Digital pulse processing and optimization of the front-end electronics for nuclear instrumentation. Applied Radiation and Isotopes, Elsevier, 2014, 87, pp.195 - 199. ⟨10.1016/j.apradiso.2013.11.090⟩. ⟨cea-01828386⟩



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