Kyoung Won JANG, Dong Hyun CHO, Sang Hun SHIN, Wook Jae YOO, Jeong Ki SEO, Bongsoo LEE^*, Sin KIM¹, Joo Hyun MOON², Young-Ho CHO³, and Byung Gi PARK⁴

School of Biomedical Engineering, Research Institute of Biomedical Engineering, Konkuk University, Chungju 380-701, Korea
¹Department of Nuclear and Energy Engineering, Applied Radiological Science Research Institute, Cheju National University, Cheju 690-756, Korea
²Department of Energy and Environmental System Engineering, Dongguk University, Gyeongju 780-714, Korea
³Department of Radiological Science, Catholic University, Daegu 712-702, Korea
⁴Department of Energy and Environmental Engineering, Soonchunhyang University, Asan 336-745, Korea

(Received July 14, 2008; Accepted March 13, 2009)

A scintillating fiber-optic dosimeter has many advantages such as real-time readout, high-resolution measurement, water-equivalence and no corrections for temperature, pressure and humidity. Organic scintillator which has water or tissue equivalent characteristics is very important to measure absorbed dose, dose rate and dose distributions exactly without any corrections and due to its small size, the sensitive volume enables accurate dose measurements in regions of high dose gradients with high spatial resolution. In this study, a scintillating fiber-optic dosimeter with an organic scintillator is fabricated to measure high-energy photon beam from a clinical linear accelerator. And we have measured linear responses of a fiber-optic dosimeter according to dose rates and monitor units of a clinical linear accelerator. Also, a percent depth dose curve for 6 MV photon beam with different field sizes are obtained.

Key words: organic scintillator, fiber-optic dosimeter, photon beam, radiotherapy

^*E-mail address: bslee@kku.ac.kr