SU-E-T-112: Dose Distribution Verification of Proton Beam Using Light Output On Scintillation Plate

Abstract

Purpose: To verify dose distribution of proton beam using CCD camera scintillation screen system. Methods: CCD camera scintillation screen system was developed to verify dose distribution at National Cancer Center in Korea. In this study, we used a high sensitivity scintillation plate to measure visible light acquired by CCD camera. The light output on scintillation plate was measured while changing the irradiation time and beam current in proton beam. Then, the results were analyzed to obtain the depth dose distribution and dose profile. The measured dose distributions in double scattering delivery mode were compared with those in ionization chamber. Results: The relationship between the light output and beam current showed good linearity. Also, the light output increased linearly with the increase of irradiation time. For the proton beam for double scattering mode, light output response on scintillation plate was compared with the dose distribution from ionization chamber and showed the good agreement. Conclusion: We evaluated the dosimetry characteristic of proton beam using CCD camera scintillation screen system. Also, we verified the dos — e distribution of proton beam for double scattering delivery mode. This work was supported by a research grant from the Ministry of Education, Science and Technology in Korea (No. 2010‐0026071) and a fund from research project of the Korea National Cancer Center (No. NCC‐0910110).