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KMID : 1151820190130030333
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Journal of the Korean Society of Radiology
2019 Volume.13 No. 3 p.333 ~ p.338
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Feasibility Study of Phosphor Particle Blended Hybrid Dosimeter for Quality Assurance in Radiation Therapy
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Shin Yo-Han
Han Moo-Jae
Jung Jae-Hoon
Cho Heung-Lae
Park Sung-Kwang
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Abstract
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In the field of radiotherapy, the Quality Assurance(QA) procedure to verify the safety of treatment is considered to be very important. However, due to various problems of the conventional dosimeters used for the QA, researches on these dosimeters have been actively carried out to replace them. In this study, to maximize the sensitivity by visible light(VL) emitted from phosphors, blended hybrid sensors were fabricated by blending various weight percent(wt%) of Gd 2 O 2 S:Tb which is a phosphor with excellent fluorescence efficiency into PbI 2 . Then, the electrical properties to high energy radiation from the blended sensors and the pure PbI 2 sensor were compared and evaluated. As a result of the sensitivity evaluation, the sensor of 3wt% showed the highest value with more than 40% difference from the other sensors, and gradual decreasing in sensitivity was observed with increasing wt% except for the sensor of 3wt%. Also, in the reproducibility evaluation, the pure PbI 2 sensor exhibited a large variation in coefficient of variation(CV)>0.015, while all the blended sensors showed CV<0.015.
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KEYWORD
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Radiation therapy, Quality Assurance, Photoconductor, phosphor, Lead(II) Iodide, Hybrid
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