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Microfluidic Platform with Multiplexed Electronic Detection for Spatial Tracking of Particles
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Accurate integral counting using multi-channel analyzers.

Ryan Fitzgerald1, Lynne King1

  • 1Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD, 20899-8642, USA.

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

Accurate radionuclide metrology requires precise integral counting. New live-timed systems with imposed dead times provide essential correction factors for multi-channel analyzers (MCAs), improving alpha- and beta-particle calibrations.

Keywords:
Dead timeIntegral countingMCAMulti-channel analyzerRadionuclide metrology

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Area of Science:

  • Nuclear physics
  • Metrology
  • Radiation detection

Background:

  • Accurate integral counting is crucial for radionuclide metrology.
  • Existing multi-channel analyzer (MCA) systems often rely on dead-time corrections that can introduce inaccuracies.

Purpose of the Study:

  • To design and evaluate live-timed integral counting systems.
  • To benchmark these systems against a NIST anti-coincidence counting system.
  • To determine correction factors for MCAs with Gedcke-Hale dead-time corrections.

Main Methods:

  • Utilized a live-timed multi-channel analyzer (MCA) with a list-mode digitizer and a live-timed scalar, incorporating imposed dead times.
  • Performed benchmarking against an existing NIST anti-coincidence counting system.
  • Conducted tests using a large-area gas-flow proportional counter and a NaI(Tl) detector for count rates up to 80,000 s-1.

Main Results:

  • Developed and validated live-timed integral counting systems.
  • Quantified correction factors applicable to MCAs employing Gedcke-Hale dead-time corrections.
  • Demonstrated the system's effectiveness at high count rates (up to 80,000 s-1).

Conclusions:

  • The developed live-timed systems provide accurate integral counting.
  • The derived correction factors enhance the precision of alpha- and beta-particle emission rate calibrations.
  • These advancements improve radionuclide metrology techniques.