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Related Experiment Video

Updated: Dec 24, 2025

A Basic Positron Emission Tomography System Constructed to Locate a Radioactive Source in a Bi-dimensional Space
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Evaluation of digital pulse processing techniques for a β-γ coincidence counting system.

M Teresa Durán1, Youcef Nedjadi1, Frédéric Juget1

  • 1Institute of Radiation Physics (IRA), Lausanne, Switzerland.

Applied Radiation and Isotopes : Including Data, Instrumentation and Methods for Use in Agriculture, Industry and Medicine
|April 7, 2020
PubMed
Summary

This study optimized digital pulse processing for radioactivity measurement systems. Evaluating various digital filters and timing methods improved signal-to-noise ratio, energy resolution, and time accuracy for beta-gamma coincidence counting.

Keywords:
Digital coincidence counting (DCC)Digital filtersDigital pulse processing (DPP)β-γ coincidence counting

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Area of Science:

  • Nuclear Physics and Instrumentation
  • Digital Signal Processing
  • Metrology

Background:

  • Radioactivity measurement systems rely heavily on signal processing, impacting results significantly.
  • Modernization of analog electronics in primary measurement systems necessitates digital solutions.
  • The Institute of Radiation Physics (IRA) is digitalizing its beta-gamma coincidence counting system.

Purpose of the Study:

  • To optimize the digital pulse processing (DPP) stage for the IRA's beta-gamma coincidence counting system.
  • To evaluate different digital filters and timing algorithms for improved performance.
  • To provide a rational basis for selecting the most appropriate DPP method.

Main Methods:

  • Implemented six digital pulse shaping filters and amplitude calculation algorithms.
  • Set up four digital timing filters and time pick-off methods (dCFD, LE).
  • Tested combinations of filters and algorithms using real (241Am, 137Cs, 60Co, 166mHo) and simulated signals.

Main Results:

  • Quantified performance metrics including processing speed, SNR, energy resolution, and time resolution.
  • Compared traditional two-channel and single-channel configurations.
  • Identified optimal filter parameters and algorithm settings for the DPP system.

Conclusions:

  • The evaluation provides a rational framework for assessing DPP methods in radioactivity measurements.
  • Results guide the selection of the most suitable digital pulse processing approach for the IRA system.
  • This digitalization effort modernizes critical radioactivity measurement infrastructure.