EP-1500: Development of Tumor Response Observation System for Dose-Volume Delivery Guided Particle Therapy

________________________________________________________________________________scored optical photon correspond to each energy band and MPI paralled computing was used. Results:The measured a photoluminescence peak value of the Gd2O3:Eu was 611nm, which was identical with literature value.In case of the calculated value using GEANT4 montecarlo code, an intensity(counting) of the photoluminescence peak value was 2 times higher, but the peak value also was identical with measured the peak value and overall trend of the photoluminescence spectrum was correspond to the measured data.A result of the decay time showed that the measured value was 1.2 times higher than that of the calculated value despite the higher intensity, but the measured and calculated value was well matched in low intensity. Conclusion:In this study, we performed Gd2O3:Eu modeling using GEANT4 and compared measured and calculated the properties of the scintillator.Through the results, we demonstrate the effectiveness of the GEANT4 code for the scintillator modeling and it was used as valuable data for the inderect raidation detector modeling using GEANT4.However, the properties of the scintillator were various according to the ratio of the body material and activator.Therefore, GEANT4 can reflect the ratio of the body material and activator and it considered as future works.