In order to increase the therapeutic effect of radiation, there has been an increase in the use of conventional photon therapy. The intensive care unit should pay more attention to the radiation safety evaluation due to the higher energy and the larger facility compared to the existing Photon treatment. These radiation safety evaluations are mainly performed by using Monte Carlo simulation, and the first thing to be done is geometric modeling. The Heavy-ion treatment facility uses synchrotron as the accelerating device, which is difficult to precisely model geometrically and is mostly modeled briefly. This study investigated the effect of simplification and precise implementation of Dipole magnet among the components of synchrotron acceleration device on the radiation safety evaluation. The results show that the simplified geometric model is overestimated with the precisely implemented geometric model. Therefore, it is considered that the radiological safety evaluation results in more reliable results of the precise geometric modeling.

ABSTRACT
 Ⅰ. INTRODUCTION
 Ⅱ. MATERIAL AND METHODS
 Ⅲ. RESULT
  1. Neutron Flux
  2. Depth Dose
  3. Total Activity
  4. 냉각시간에 따른 Dose rate
 Ⅳ. DISCUSSION
 Ⅴ. CONCLUSION
 Reference
 요 약

• Seunguk Heo(Department of Biomedical Engineering, Inje University) | 허승욱
• Yongkeun Song(Gimhae Biomedical Center, Gimhae Industry Promotion and Biomedical Foundation) | 송용근
• Gyuseok Cho(Department of Radiation Instrument, Korea Institute of Radiological and Medical Sciences) | 조규석
• Moojae Han(Department of Biomedical Engineering, Inje University) | 한무재
• Jikoon Park(Department of Radiological Science, International University of Korea) | 박지군 교신저자