Spectrometry of pulsed photon radiation

Area of Science:

• Medical Physics
• Radiation Detection and Measurement
• Computational Physics

Background:

• Active detectors face limitations in measuring pulsed photon radiation energy spectra.
• Accurate spectral information is crucial for radiation safety and dosimetry in various applications.

Purpose of the Study:

• To develop and validate a few-channel spectrometer using thermoluminescence detectors (TLDs) for pulsed photon radiation.
• To employ Bayesian data analysis for deducing absolute photon spectra and associated uncertainties.

Main Methods:

• A multi-layer spectrometer comprising 30 TLDs separated by absorbers of varying atomic numbers and thicknesses was designed.
• Radiation energy was inferred based on penetration depth, with higher energy photons reaching deeper layers.
• Bayesian inference was utilized to reconstruct the photon energy spectrum from TLD dose measurements and prior information.

Main Results:

• The TLD-based spectrometer successfully measured photon energy spectra in diverse radiation fields.
• Absolute spectra, doses, and their uncertainties were accurately determined using the Bayesian approach.
• The system demonstrated efficacy with industrial pulsed X-ray generators and a medical linear accelerator.

Conclusions:

• The TLD spectrometer coupled with Bayesian analysis provides a viable solution for measuring pulsed photon radiation energy distributions.
• This method offers accurate spectral and dose determination, including uncertainty quantification.
• The spectrometer's successful application in industrial and medical settings highlights its versatility and effectiveness.