Determination of Quality Factors for Cylindrical Ionization Chambers in kV X-rays: Review of IAEA Dosimetry Protocol and Monte Carlo Calculations and Measurements for N23333 and N30001 Chambers.
- Author:
Kang Kyoo LEE
1
;
Dong Hyeok JEONG
;
Chunil LIM
;
Sei Kyung CHANG
;
Sun Rock MOON
Author Information
1. Department of Radiation Oncology, Wonkwang University School of Medicine, Wonkwang Medical Science Research Center, Iksan, Korea.
- Publication Type:Original Article
- Keywords:
kV X-rays;
IAEA protocol;
Quality factor
- From:Korean Journal of Medical Physics
2005;16(2):53-61
- CountryRepublic of Korea
- Language:Korean
-
Abstract:
The quality factors for cylindrical ionization chambers for kV X-rays were determined by Monte Carlo calculation and measurement. In this study, the X-rays of 60~300 kV beam (ISO-4037) installed in KFDA and specified in energy spectra and beam qualities, and the chambers of PTW N23333 and N30001 were investigated. In calculations, the k(u) and k(Q,Q(0)) in IAEA dosimetry protocols were determined from the air kerma and the cavity dose obtained by theoretical and Monte Carlo calculations. It is shown that the N30001 chamber has a flat response of +/-1.7% in 110~300 kV region, while the response range of two chambers were shown to +/-3~4% in 80~250 kV region. From this work we have discussed dosimetry protocol for the kV X-rays and we have found that the estimation of energy dependency is more important to apply dosimetry protocol for kV X-rays.
