Calculation of the average energy absorbed in photon interactions

Area of Science:

• Physics
• Medical Physics
• Computational Physics

Background:

• High-energy electrons lose energy via bremsstrahlung radiation when interacting with matter.
• Accurate calculation of this energy loss is crucial for determining energy absorption coefficients.
• Previous data tables may contain inaccuracies affecting downstream calculations.

Purpose of the Study:

• To identify and quantify errors in bremsstrahlung energy loss calculations.
• To assess the impact of these errors on radiation dosimetry.
• To highlight the need for revised data for high-energy photon interactions.

Main Methods:

• Analysis of simplifying assumptions in existing bremsstrahlung models.
• Comparison of theoretical calculations with experimental data (implied).
• Evaluation of energy absorption coefficients based on corrected bremsstrahlung losses.

Main Results:

• Identified significant errors in published bremsstrahlung data by Plechaty et al.
• Errors stem from two specific simplifying assumptions.
• Discrepancies can reach a factor of two for high-energy photons and high atomic number materials.

Conclusions:

• The identified errors in bremsstrahlung calculations have substantial implications for radiation dosimetry.
• Revised and accurate data are necessary for reliable dosimetry calculations.
• This work underscores the importance of rigorous validation of computational models in physics.