Readout models for BaFBr_0.85I_0.15:Eu image plates

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.