Characteristics of Detectors for Measurements of Photon Depth Doses in Build-Up Region / 의학물리
Korean Journal of Medical Physics
; : 77-81, 2005.
Article
en Ko
| WPRIM
| ID: wpr-187034
Biblioteca responsable:
WPRO
ABSTRACT
To determine the appropriate method out of various available methods to measure build-up doses, the measurements and comparisons of depth doses of build-up region including the surface dose were executed using the Attix parallel-plate ionization chamber, the Markus chamber, a cylindrical ionization chamber, and a diode detector. Based on the measurements using the Attix chamber, discrepancies of the Markus chamber were within 2% for the open field and increased up to 3.9% in the case of photon beam containing the contaminant electrons. The measurements of an cylindrical ionization chamber and a diode detector accord with those of the Attix chamber within 1.5% and 1.0% after those detectors were completely immersed in the water phantom. The results suggest that the parallel-plate chamber is the best choice to measure depth doses in the build-up region containing the surface, however, using cylindrical ionization chamber or diode detector would be a reasonable choice if no special care is necessary for the exact surface dose.
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1
Índice:
WPRIM
Asunto principal:
Agua
Idioma:
Ko
Revista:
Korean Journal of Medical Physics
Año:
2005
Tipo del documento:
Article