Uncertainty in positioning ion chamber at reference depth for various water phantoms

Reports of Practical Oncology and Radiotherapy : Journal of Greatpoland Cancer Center in Poznań and Polish Society of Radiation Oncology
Naoki KinoshitaHirohiko Kimura

Abstract

Uncertainty in the calibration of high-energy radiation sources is dependent on user and equipment type. We evaluated the uncertainty in the positioning of a cylindrical chamber at a reference depth for reference dosimetry of high-energy photon beams and the resulting uncertainty in the chamber readings for 6- and 10-MV photon beams. The aim was to investigate major contributions to the positioning uncertainty to reduce the uncertainty in calibration for external photon beam radiotherapy. The following phantoms were used: DoseView 1D, WP1D, 1D SCANNER, and QWP-07 as one-dimensional (1D) phantoms for a vertical-beam geometry; GRI-7632 as a phantom for a fixed waterproofing sleeve; and PTW type 41023 and QWP-04 as 1D phantoms for a horizontal-beam geometry. The uncertainties were analyzed as per the Guide to the Expression of Uncertainty in Measurement. The positioning and resultant uncertainties in chamber readings ranged from 0.22 to 0.35 mm and 0.12-0.25%, respectively, among the phantoms (using a coverage factor k = 1 in both cases). The major contributions to positioning uncertainty are: definition of the origin for phantoms among users for the 1D phantoms for a vertical-beam geometry, water level adjustment among users for ...Continue Reading

References

Mar 1, 1990·Medical Physics·D E MellenbergC R Blackwell
May 30, 2007·Journal of Applied Clinical Medical Physics·Mehenna AribYoucef Boudouma
May 2, 2008·Journal of Applied Clinical Medical Physics·Pablo CastroJuan J Torres
Oct 10, 2008·Medical Physics·Indra J DasUNKNOWN TG-106 of the Therapy Physics Committee of the AAPM
Dec 17, 2010·Medical Physics·B R Muir, D W O Rogers

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Citations

Feb 22, 2021·Physica Medica : PM : an International Journal Devoted to the Applications of Physics to Medicine and Biology : Official Journal of the Italian Association of Biomedical Physics (AIFB)·M De Saint-HubertP Olko

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