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Optical-Radiation-Calorimeter Refinement by Virtual-Sensitivity Analysis.

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Digital holographic interferometry (DHI) radiation dosimetry shows promise for precise dose measurement. Optimizing path lengths and miniaturizing the detector significantly reduces environmental errors, enhancing spatial resolution for radiation dosimetry.

Keywords:
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Area of Science:

  • Medical Physics
  • Optical Metrology
  • Radiation Detection

Background:

  • Digital holographic interferometry (DHI) offers noninvasive optical calorimetry for radiation dosimetry.
  • Previous prototypes showed feasibility but were sensitive to environmental factors and setup.

Purpose of the Study:

  • To investigate and mitigate environmental influences on DHI radiation dosimetry.
  • To optimize a virtual DHI dosimeter using optical modeling software.

Main Methods:

  • A virtual DHI dosimeter was created and tested with virtual phantoms.
  • Simulated environmental perturbations (temperature, vibration, atmospheric changes) were applied.
  • The impact of path length equalization and miniaturization was evaluated.

Main Results:

  • Environmental factors like heat expansion and atmospheric drift caused dose variations.
  • Atmospheric fluctuations and vibrations introduced noise, reducing spatial resolution.
  • Equalizing path lengths reduced errors by over 96%; miniaturization decreased sensitivity to vibrations and turbulence by up to 54.5%.

Conclusions:

  • DHI radiation dosimetry is feasible but requires mitigation of environmental influences.
  • Path length equalization and miniaturization are effective strategies for improving accuracy and resolution.
  • Virtual modeling provides a robust method for optimizing optical detector systems.