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KMID : 0384620110220010052
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Korean Journal of Medical Physics
2011 Volume.22 No. 1 p.52 ~ p.58
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Feasibility Study of the Radiophotoluminescent Glass Dosimeter for High-energy Electron Beams
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Son Ki-Hong
Jung Hai-Jo
Shin Sang-Hun
Lee Hyun-Ho
Lee Sung-Hyun
Kim Mi-Sook
Ji Young-Hoon
Kim Kum-Bae
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Abstract
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Our goal is to assess the suitability of a glass dosimeter on detection of high-energy electron beams for clinical
use, especially for radiation therapy. We examined the dosimetric characteristics of glass dosimeters including
dose linearity, reproducibility, angular dependence, dose rate dependence, and energy dependence of 5 different
electron energy qualities. The GD was irradiated with high-energy electron beams from the medical linear
accelerator andgamma rays from a cobalt-60 teletherapy unit. All irradiations were performed in a water phantom.
The result of the dose linearity for high-energy electron beams showed well fitted regression line with the
coefficient of determination; R2 of 0.999 between 6 and 20 MeV. The reproducibility of GDs exposed to the
nominal electron energies 6, 9, 12, 16, and 20 MeV was ±1.2%. In terms of the angular dependence to electron
beams,GD response differences to the electron beam were within 1.5% for angles ranging from 0o to 90o and
GD’s maximum response differencewas 14% lower at 180o. In the dose rate dependence, measured dose values
were normalized to the value obtained from 500 MU/min. The uncertainties of dose rate were measured within
±1.5% except for the value from 100 MU/min. In the evaluation of the energy dependence of the GD at nominal
electron energies between 6 and 20 MeV, we obtained lower responses between 1.1% and 4.5% based on
cobalt-60 beam. Our results show that GDs have a considerable potentiality for measuring doses delivered by
high-energy electron beams.
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KEYWORD
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Glass dosimeter, Dosimetric characteristics, Electron beam
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