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- Title
Electron beam detection in radiotherapy using a capacitor dosimeter equipped with a silicon photodiode.
- Authors
Yamaguchi, Satoshi; Ieko, Yoshiro; Ariga, Hisanori; Yoshioka, Kunihiro
- Abstract
In this study, a newly developed capacitor dosimeter was evaluated using electron beams commonly utilized in radiotherapy. The capacitor dosimeter comprised a silicon photodiode, 0.47-μF capacitor, and dedicated terminal (dock). Before electron beam irradiation, the dosimeter was charged using the dock. The doses were measured without using a cable by reducing the charging voltages using the currents from the photodiode during irradiation. A commercially available parallel-plane-type ionization chamber and solid–water phantom were used for dose calibration with an electron energy of 6 MeV. In addition, the depth doses were measured using a solid–water phantom at electron energies of 6, 9, and 12 MeV. The doses were proportional to the discharging voltages, and the maximum dose difference in the calibrated doses measured using a two-point calibration was approximately 5% in the range of 0.25–1.98 Gy. The depth dependencies at energies of 6, 9, and 12 MeV corresponded to those measured using the ionization chamber.
- Subjects
ELECTRON detection; DOSIMETERS; CAPACITORS; IONIZATION chambers; ELECTRON beams; SILICON
- Publication
Medical & Biological Engineering & Computing, 2023, Vol 61, Issue 8, p2197
- ISSN
0140-0118
- Publication type
Article
- DOI
10.1007/s11517-023-02870-7