Evaluation of digital pulse processing techniques for a β-γ coincidence counting system.

Détails

ID Serval
serval:BIB_D080F3986143
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Evaluation of digital pulse processing techniques for a β-γ coincidence counting system.
Périodique
Applied radiation and isotopes
Auteur⸱e⸱s
Durán M.T., Nedjadi Y., Juget F., Bochud F., Bailat C.
ISSN
1872-9800 (Electronic)
ISSN-L
0969-8043
Statut éditorial
Publié
Date de publication
05/2020
Peer-reviewed
Oui
Volume
159
Pages
109100
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Résumé
Signal processing is a core part of any electronic chain for radioactivity measurement systems and can influence measurement results drastically. A thorough study of the different alternatives for this treatment is especially worthwhile when developing a new digital system. This article describes an evaluation performed to optimize the digital pulse processing stage of the β-γ coincidence counting system at the Institute of Radiation Physics (IRA) designated laboratory for the activity unit. This study is a part of IRA's digitalization project to modernize the aging analog electronic hardware of its primary measurement systems. The β-γ coincidence counting system consists of a plastic scintillation detector in the beta channel and a well-type NaI detector in the gamma channel. Six pulse shaping digital filters along with amplitude calculation algorithms were implemented to obtain beta and gamma pulse amplitude values. In addition, four timing digital filters and time pick-off methods were set up to calculate arrival times (timestamps) for the pulses generated by both detectors. Filter parameters and algorithm settings were adjusted to obtain the best performance. Combination of filters into traditional two channel (fast for timing and slow for shaping) or one channel configuration using dCFD (digital constant fraction discrimination) and LE (leading edge) time pick-off methods were also tested and compared to study the whole digital pulse processing system, using both real measurement signals ( <sup>241</sup> Am, <sup>137</sup> Cs, <sup>60</sup> Co and <sup>166m</sup> Ho) and simulated reference pulses. The results of these tests were quantified by evaluating the following metrics: processing speed, signal-to-noise ratio (SNR) at different energies, gamma energy resolution, time measurement accuracy, time resolution and detection efficiency. The results of this evaluation provide a rational ground to assess the system and help decide which digital pulse processing (DPP) method should be the most appropriate.
Mots-clé
Digital coincidence counting (DCC), Digital filters, Digital pulse processing (DPP), β-γ coincidence counting
Pubmed
Création de la notice
25/04/2020 21:31
Dernière modification de la notice
24/02/2023 6:51
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