Electron beam detection in radiotherapy using a capacitor dosimeter equipped with a silicon photodiode.
Med Biol Eng Comput
; 61(8): 2197-2205, 2023 Aug.
Article
in En
| MEDLINE
| ID: mdl-37380785
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.
Key words
Full text:
1
Collection:
01-internacional
Database:
MEDLINE
Main subject:
Silicon
/
Electrons
Type of study:
Diagnostic_studies
Language:
En
Journal:
Med Biol Eng Comput
Year:
2023
Document type:
Article
Affiliation country:
Japón