ArticleJournal of applied clinical medical physics2026
Investigation of ion recombination and polarity effects in high dose rate electron beams.
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
backgroundAccurate dosimetry is essential for enhancing the effectiveness and safety of radiotherapy treatment. High dose rate electron (HDRE) beams, a dose rate up to ten times higher at the measurement point than standard electron beam at the same Monitor Unit (MU). The increased ionization density raises concern about ion recombination effects, which may affect the reliability of ionization chamber readings. PURPOSE: This study aims to evaluate the effects of ion recombination (
methodsMeasurements were carried out using Elekta VersaHD, linear accelerator at 6 MeV and 10 MeV both in standard and HDRE modes using three ionization chambers: IBA PPC40, FC65-P and CC13. Data were collected at a source-to-surface distance (SSD) of 100 cm, referring to the standard dosimetry protocols TRS-398 and AAPM TG-51, along with a modified method. Modified method using beam quality conversion factor (
resultsBased on three dosimetry protocols, all ionization chambers showed improved performance, with the
conclusionsBased on data variations, we recommend elevated operating voltage (400 V) than typical voltage (300 V) to reduce ion recombination in HDRE beams. Furthermore, modified method can be alternative to measure the accuracy of charge readings for absolute dosimetry.
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