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KMID : 1038720140250010031
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Progress in Medical Physics
2014 Volume.25 No. 1 p.31 ~ p.36
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Evaluation of Dosimetric Characteristics of Reproducibility, Linearity and Dose Dependence of Optically Stimulated Luminescence Dosimeters in Co-60 Gamma-rays
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Kim Chang-Bum
Choi Sang-Hyoun
Park Seung-Woo
Kim Chul-Hang
Jung Hai-Jo
Kim Mi-Sook
Yoo Hyung-Jun
Kim Chan-Hyeong
Ji Young-Hoon
Yi Chul-Young
Kim Kum-Bae
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Abstract
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We aimed to evaluate the dosimetric characteristics of reproducibility, linearity and dose dependence of optical stimulated luminance dosimeter (OSLD) in the Co-60 Gamma-rays and to analyze with a precedent study in field of the diagnostic radiography and radiotherapy. The reproducibility was 0.76% of the coefficient of variation, the homogeneity was within 1.5% of the coefficient of variation and OSLD had supra-linear response more than 3 Gy. So the correlation between dose and count was fitted by quadratic function. The count depletion by repeated reading was 0.04% per reading regardless of the irradiated dose. And the half time of decay curve according to the irradiated dose was 0.68 min. with 1 Gy, 1.04 min. with 5 Gy, and 1.10 min. with 10 Gy, respectively. In case of annealing for 30 min, the removal rate was 88% with 1 Gy, 90% with 5 Gy, and 92% with 10 Gy, respectively and 99% in case of annealing time for 4 hour. It is feasible to use OSLDs for dose evaluation in Co-60 Gamma-rays when considering the uncertainty on the procedure according to the irradiated dose.
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KEYWORD
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Optical stimulated luminance dosimeters, Dosimetric characteristics, Co-60
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