Measurement of Leakage and Design for the Protective Barrier of the High Energy Radiation Therapy Room

고 에너지 방사선 치료실의 차폐계산과 누출선량의 측정

  • Chu, Sung-Sil (Department of Radiology & Nuclear Medicine Yonsei University College of Medicine) ;
  • Park, Chang-Yun (Department of Radiology & Nuclear Medicine Yonsei University College of Medicine)
  • 추성실 (연세대학교 의과대학 방사선과학교실) ;
  • 박찬윤 (연세대학교 의과대학 방사선과학교실)
  • Published : 1981.10.31


The logical development of an optimum structural shielding design and the computation of protective barriers for high energy radiation therapy room, Toshiba 13 MeV. are presented. We obtained following results by comparison in between the precalculating values and actual survey after complete installation of radiogenerating units. 1. The calculating formula for the protective barrier written in NCRP report #34(1970) was the most ideal and economic calculating methods for the construction of barrier and to determine thickness for the meeting requirements of the number of patients of 80-100 in daily treatment. 2. The precalculating values of protective barrier are 5 times more protective than that of actual measurement. It is depending on radiation workload and utilization the datas most sequrely. 3. The dose rate during exposure are 2-10 mR/hr at out of the door and the controll room. 4. The foul smelling and ozone gas production from long exposure of cancer patients cannot be eliminated when the room is ill ventilated.