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Optimum threshold setting for a positron-sensitive probe with background rejection capability.

Seiichi Yamamoto1, Kenichi Matsumoto, Michio Senda

  • 1Department of Electrical Engineering, Kobe City College of Technology, Japan. s-yama@kobe-kosen.ac.jp

Annals of Nuclear Medicine
|July 6, 2004
PubMed
Summary

Optimizing threshold levels in positron-sensitive probes reduces background noise. New settings for plastic scintillators and bismuth germanate (BGO) significantly decrease scattered photon counts, improving data accuracy.

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Area of Science:

  • Nuclear Instrumentation
  • Particle Physics Detectors

Background:

  • Scattered annihilation photons in plastic scintillators contribute to background counts in positron-sensitive probes.
  • Existing methods to reject these scattered photons by increasing threshold levels reduce overall system sensitivity.

Purpose of the Study:

  • To theoretically and experimentally optimize threshold levels for plastic scintillators and bismuth germanate (BGO) detectors.
  • To minimize background counts in positron-sensitive probes while maintaining system sensitivity.

Main Methods:

  • Calculated energy loss of scattered annihilation photons in plastic scintillator and BGO materials.
  • Measured background counts by systematically varying threshold levels for both detector components.
  • Determined optimal threshold settings for the positron-sensitive probe.

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Main Results:

  • Identified optimal threshold settings at 0.3 for the plastic scintillator's peak pulse level and 0.7 for the BGO's peak pulse level.
  • Achieved a reduction in background counts to less than 0.2% of true positron counts with the optimized settings.

Conclusions:

  • The optimized threshold levels effectively suppress background noise caused by scattered annihilation photons.
  • This optimization significantly enhances the signal-to-noise ratio in positron-sensitive probe measurements.