[Beam quality conversion factor]

Area of Science:

• Medical Physics
• Radiation Dosimetry

Context:

• The standard dosimetry protocol in Japan relies on the beam quality conversion factor k(Q,Q0) to ensure accurate radiation measurements.
• Ionization chambers are calibrated at a reference beam quality (Q0) but used in various user beam qualities (Q).

Purpose:

• To report the updated beam quality conversion factor k(Q,Q0) for Japan's standard dosimetry protocol.
• To detail the recalculation of perturbation correction factors using Monte Carlo simulations.

Summary:

• The update to k(Q,Q0) was driven by revised perturbation correction factors, recalculated via Monte Carlo simulations.
• The study discusses the calculation process and highlights remaining challenges in the update.

Impact:

• Ensures more accurate radiation dosimetry in clinical and research settings in Japan.
• Provides a foundation for future refinements in dosimetry protocols and measurement accuracy.