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KMID : 1164220100220020123
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Journal of Korean Society for Radiotherapeutic Technology
2010 Volume.22 No. 2 p.123 ~ p.129
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Characteristic Evaluation of Optically Stimulated Luminescent Dosimeter (OSLD) for Dosimetry
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Kim Jeong-Mi
Jeon Soo-Dong
Back Geum-Mun
Jo Young-Pil
Yoon Hwa-Ryong
Kwon Kyung-Tae
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Abstract
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Purpose: The purpose of this study was to evaluate dosimetric characteristics of Optically stimulated luminescent dosimeters (OSLD) for dosimetry
Materials and Methods: InLight/OSLNanoDot™ dosimeters was used including Inlight™MicroStarReader, Solid Water Phantom, and Linear accelerator (TRYLOGY®) OSLDs were placed at a Dmax in a solid water phantom and were irradiated with 100 cGy of 6 MV X-rays. Most irradiations were carried out using an SSD set up 100 cm, 10x10 cm2 field and 300 MU/min. The time dependence were measured at 10 minute intervals. The dose dependence were measured from 50 cGy to 600 cGy. The energy dependence was measured for nominal photon beam energies of 6, 15 MV and electron beam energies of 4-20 MeV. The dose rate dependence were also measured for dose rates of 100-1,000 MU/min. Finally, the PDD was measured by OSLDs and Ion-chamber.
Results: The reproducibility of OSLD according to the Time flow was evaluated within ±2.5%. The result of Linearity of OSLD, the dose was increased linearly up to about the 300 cGy and increased supralinearly above the 300 cGy. Energy and dose rate dependence of the response of OSL detectors were evaluated within ±2% and ±3%. PDD10 and PDD20 which were measured by OSLD was 66.7%, 38.4% and and which were measured by Ion-chamber was 66.6%, 38.3%
Conclusion: As a result of analyzing characteration of OSLD, OSLD was evaluated within ±3% according to the change of the time, enregy and dose rate. The PDD10 and PDD20 are measured by OSLD and ion-chamber were evaluated within 0.3%. The OSL response is linear with a dose in the range 50~300 cGy. It was possible to repeat measurement many times and progress of the measurement of reading is easy. So the stability of the system and linear dose response relationship make it a good for dosimetry.
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KEYWORD
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optically stimulated luminescent dosimeter, dosimetric characterization
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