고선량 Ir-192 선원 교정기의 제작 및 특성

• 영문명: High Dose Rate Ir-192 Source Calibration Method with Newly Designed Calibration Jig
• 발행기관: 대한방사선종양학회
• 저자명: 이병용(Byong Yong Yi) 최은경(Eun Kyung Choi) 장혜숙(Hyesook Chang)
• 간행물 정보: 『대한방사선종양학회지』제7권 제2호, 299~303쪽, 전체 5쪽
• 주제분류: 의약학 > 종양학
• 파일형태: PDF
• 발행일자: 1989.12.30

영문 초록

Authors have developed highly reproducible calibration method for the Micro-Selectron HDR Ir-192 system (Nucletron, Netherland). The new jig has a 10cm radius circular hole in the 30cm×30cm×0.2cm acrylic plate, and 5F fllexible bronchial tubes are attached around the hole. The source moves along the circle in the tubes and the ionization chamber is placed verticaly at the center of the circular hole (center of the jig). Dose distribution near the center was derived theoretically, and measured with the film dosimetry system. Theoretical calculation and measurement show the error margin below 0.1% for 1mm or 2mm position deviation. We have measured at 12 and 24 points of circle with 1, 6, 11 and 21 second dwell time of source in order to calculate the activity of the source. Measurements have been repeated daily for 50 days. The accuracy and the reproducibility are below 1% error margin. The half life of the source from our measurement is estimated 73.4±0.4 days.

키워드

High Dose Rate Ir-192 Calibration