https://doi.org/10.1140/epjp/s13360-024-05434-2
Regular Article
Chamber-type dependence of scaling factors during electron dosimetry inside plastic phantoms
1
Physics Department, Hakim Sabzevari University, Sabzevar, Iran
2
SC Fisica Sanitaria, ASST Papa Giovanni XXIII, Bergamo, Italy
3
Medical Physics and Radiological Sciences Department, Sabzevar University of Medical Sciences, Sabzevar, Iran
Received:
31
December
2023
Accepted:
7
July
2024
Published online:
20
July
2024
Although each specific plastic phantom has dedicated depth scaling and fluence scaling factor (cpl and hpl) values for electron dosimetry purposes, these scaling factors may change based on the ionization chamber dosimeter used for ionometric dosimetry inside the plastic phantom. The current study aims to evaluate the chamber-type dependence of the cpl and hpl values for a typical plastic phantom at different electron energies. RW3 plastic phantom was used, and the cpl and hpl values at different energies were measured by Roos, Markus, and Advanced Markus ionization chambers. The obtained cpl and hpl values by each considered chamber were compared to evaluate how chamber type variation can affect scaling factor values. The accuracy of determined scaling factors by each chamber was assessed through comparing the measured percentage depth dose (PDD) curves inside the water and plastic phantoms. The results demonstrated that the cpl value varies with changing the employed ionization chamber. For example, the cpl value changes approximately 4.38% when moving from Advanced Markus chamber to Roos chamber at 4 MeV. hpl values were also dependent on employed chamber type. Although the cpl–hpl values for all chambers accurately reproduced the measured PDD curves inside the water, the Roos chamber showed the best performance, with a minimum mean difference of about 0.75% between the dosimetric parameters of in-water and in-plastic PDD curves measured by this chamber. Both cpl and hpl depend on the chamber type, even for the same plastic phantom material. The determined cpl–hpl value for a typical ionization chamber cannot be used with other chamber types. Finally, the type of employed ionization chamber can affect the accuracy of the measured scaling factors.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2024. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
