ArticleJournal of applied clinical medical physics2026
Experimentally derived beam quality correction factors for PPC05 and razor nano ionization chambers in proton scanned beams based on graphite calorimetry.
Article in Journal of applied clinical medical physics, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
backgroundIonization chamber based reference dosimetry of proton beam requires the use of beam quality correction factors which are obtained experimentally or by Monte Carlo simulation and are available to users in codes of practice and other publications. PURPOSE: The aim of this work is to determine experimental proton beam quality correction factors,
methodsMeasurements were performed in scanned clinical proton beams at two clinical centers. Absorbed dose to graphite was determined using a recently developed portable graphite calorimeter. The conversion factors for the absorbed dose to water determination were obtained by Monte Carlo simulations. Finally, the experimental
resultsFor the IBA PPC05 chamber, the experimental values agreed with recommended values tabulated in TRS-398 (rev. 1) within the combined experimental uncertainty for the three residual ranges of 3.4, 13.3 and 27.7 g·cm
conclusionsThis study demonstrates the feasibility and high precision of using a portable graphite calorimeter for beam quality correction factor determination in the user beam quality. The short room occupation time required (around 3 hours) makes the system useful as well for beam output dosimetry audits without disturbing clinical practice.
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