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논문 기본 정보
- 자료유형
- 학위논문
- 저자정보
- 지도교수
- 이승욱
- 발행연도
- 2016
- 저작권
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When a cyclotron produces 18F-, an accelerated protons cause the nuclear reaction with a target and the components around it. They become objects that emit the residual radiation by the nuclear reaction with protons, so it is necessary to pay attention to the radiation exposure after the operation of cyclotron.
In this study, we measure and analyse the target to confirm the kind of residual activated nuclides and the radioactivity after production of 18F-. The cyclotron(IBA cyclone 18/9 model) is operated at 13MeV proton energy and 35μA accelerating current for 2 hours. The target sample is analyzed by the high-putity germanium(HPGe) gamma-ray spectrometry. The area radiation monitor and the dose calibarator confirm the dose rate of the target and the radioactivity of residual 18F- of the target.
The major radioactive nuclides of the target are 51Cr, 52Mn, 54Mn, 56Co, 57Co, 58Co, etc, and the radioactivity of 58Co is the highest among the detected nuclides. The dose rate of the residual 18F- exponentially decreases over time, and there is an indication of 95% reduction of the dose rate of the target after 10 hours from the stop of an operation.
We expect that the target maintenance of the cyclotron can be optimized by access time and work time that are analyzed in this study, and it satisfies ICRP 103 recommendation for the worker protection.
In this study, we measure and analyse the target to confirm the kind of residual activated nuclides and the radioactivity after production of 18F-. The cyclotron(IBA cyclone 18/9 model) is operated at 13MeV proton energy and 35μA accelerating current for 2 hours. The target sample is analyzed by the high-putity germanium(HPGe) gamma-ray spectrometry. The area radiation monitor and the dose calibarator confirm the dose rate of the target and the radioactivity of residual 18F- of the target.
The major radioactive nuclides of the target are 51Cr, 52Mn, 54Mn, 56Co, 57Co, 58Co, etc, and the radioactivity of 58Co is the highest among the detected nuclides. The dose rate of the residual 18F- exponentially decreases over time, and there is an indication of 95% reduction of the dose rate of the target after 10 hours from the stop of an operation.
We expect that the target maintenance of the cyclotron can be optimized by access time and work time that are analyzed in this study, and it satisfies ICRP 103 recommendation for the worker protection.
목차
국문요지 ⅰ그림목차 ⅲ표목차 ⅴ제1장 서론 11-1 연구 필요성 12-2 연구 목적 2제2장 이론적 배경 32-1 사이클로트론 현황 및 PET-CT 원리 32-2 사이클로트론의 작동원리 62-3 사이클로트론의 주요구성 82-4 사이클로트론센터 시설의 구성 142-5 표적방사화 192-6 방사선방호 25제3장 재료 및 방법 273-1 연구 재료 273-2 연구 방법 39제4장 결과 및 고찰 434-1 표적 방사화 핵종 분석 434-2 표적 공간선량률 변화 분석 47제5장 결론 51참고문헌Abstract감사의 글
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