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Readout models for BaFBr0.85I0.15:Eu image plates.

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Repeated scanning of photostimulated luminescence image plates enhances dynamic range. New models estimate readout fading by linking activated center depth to signal, improving hard x-ray diagnostics.

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Area of Science:

  • Medical Physics
  • Radiation Detection
  • Materials Science

Background:

  • Photostimulated luminescence (PSL) imaging plates offer a wide dynamic range for radiation detection.
  • Accurate signal quantification is crucial for advanced applications like hard x-ray diagnostics.
  • Readout fading in PSL plates can affect signal accuracy over time.

Purpose of the Study:

  • To develop and validate models for estimating readout fading in photostimulated luminescence image plates.
  • To enhance the dynamic range of PSL imaging through repeated scanning techniques.
  • To improve the accuracy of hard x-ray energy spectra measurements using PSL diagnostics.

Main Methods:

  • Developed two semi-empirical models to describe readout fading in PSL image plates.
  • Estimated model parameters using image plate scan series from BAS-MS plates.
  • Utilized the Typhoon FLA 7000 scanner for data acquisition.
  • Applied the models to experimental data from hard x-ray diagnostics with double exponential spectra.

Main Results:

  • Demonstrated that repeated scanning of PSL image plates significantly extends the extractable dynamic range.
  • The introduced models successfully relate the depth distribution of activated PSL centers to the recorded signal, accounting for readout fading.
  • Model parameter estimation provided reliable response estimates for the hard x-ray diagnostic system.

Conclusions:

  • The linearity of the photostimulated luminescence process supports repeated scanning for extended dynamic range.
  • The developed semi-empirical models offer a viable method for correcting readout fading in PSL image plates.
  • These advancements enhance the utility of PSL imaging for precise hard x-ray diagnostics.