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Optical imaging of muons.

Seiichi Yamamoto1, Kazuhiko Ninomiya2, Naritoshi Kawamura3

  • 1Department of Integrated Health Science, Nagoya University Graduate School of Medicine, Nagoya, Japan. s-yama@met.nagoya-u.ac.jp.

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Optical imaging successfully visualized muons, enabling range and width estimations. This technique shows promise for muon research and future radiotherapy applications.

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Area of Science:

  • Medical Physics
  • Particle Physics
  • Optical Imaging

Background:

  • Optical imaging is a promising technique for particle beam range and width estimation.
  • The feasibility of optical imaging for muons was previously unclear.

Purpose of the Study:

  • To investigate the possibility of optical imaging for high-intensity muons.
  • To assess optical imaging as a method for muon quality assessment and potential radiotherapy applications.

Main Methods:

  • Positive muons with varying momenta were irradiated into water and plastic scintillator blocks.
  • Images were captured using a charge-coupled device (CCD) camera during irradiation.
  • Analysis focused on light distribution, range estimation, and positron emission asymmetry.

Main Results:

  • Water produced elliptical light distributions at the muon range end due to Cherenkov radiation from decay positrons.
  • Plastic scintillators yielded images correlating with dose distributions.
  • Muon ranges were estimated from optical images, with water measurements showing a 4-5 mm discrepancy compared to calculations.

Conclusions:

  • Optical imaging of muons is feasible and effective.
  • The technique allows for range and width estimation, and analysis of positron emission asymmetry.
  • Optical imaging presents a promising avenue for muon quality assessment, research, and future muon radiotherapy.