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An alternative method for tracking a radioactive particle inside a fluid.

Wilson S Vieira1, Luís Eduardo B Brandão2, Delson Braz3

  • 1Nuclear Engineering Institute, Nuclear Engineering Service, Hélio de Almeida Street, 75 Cidade Universitária, Ilha do Fundão, P.O. Box 68550, Rio de Janeiro, 21941-972, RJ, Brazil.

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

This study introduces a novel method for tracking radioactive particles in fluids using cubic cells and EM reconstruction. The technique accurately reconstructs particle trajectories and velocities, offering a new approach for opaque environments.

Keywords:
CARPTDetection of gamma radiationEM algorithmImage reconstructionRadioactive tracer

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Area of Science:

  • Nuclear Physics
  • Fluid Dynamics
  • Image Reconstruction

Background:

  • Tracking radioactive particles in opaque fluids is challenging.
  • Existing methods may lack precision or applicability in complex environments.

Purpose of the Study:

  • To develop and validate a new method for tracking radioactive particle movement in fluids.
  • To utilize the expectation-maximization (EM) algorithm for particle localization and trajectory reconstruction.

Main Methods:

  • Representing particle trajectory as a sequence of occupied cubic cells.
  • Applying the EM reconstruction algorithm to determine the most probable cell containing the particle.
  • Calculating particle coordinates and velocities based on reconstructed cell positions.

Main Results:

  • Experimental validation using a gamma radiation detection system and radioisotope (198)Au.
  • Maximum deviation between theoretical and experimental average rotating period was less than 8%.
  • Reconstructed particle trajectories accurately represent real movement.

Conclusions:

  • The proposed method offers a paradigm shift in tracking radioactive particles.
  • This alternative method effectively addresses the complexity of tracking particles in opaque units.
  • The technique demonstrates high accuracy and representativeness for particle movement analysis.