몬테칼로 계산을 이용한 평판형 전리함의 고에너지 전자선에 대한 선질보정인자 결정
Determination of Quality Correction Factors for a Plane-Parallel Chamber in High Energy Electron Beams using Monte Carlo Calculation
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초록
국제원자력기구의 TRS-398 측정 프로토콜을 임상에 적용하기 위해서는 사용하는 빔과 전리함에 대한 선질보정인자가 필요하다. 본 연구에서는 몬테칼로 계산코드(DOSRZnrc/EGSnrc)를 사용하여 상용의 평판형전리함에 대한 고에너지 전자선(4~20MeV)에서의 선질보정인자를 계산하였다. 계산결과를 프로토콜에서 제시하는 값과 비교한 결과 5~20MeV에서 약 1% 이내로 일치하였으며 4MeV의 경우에는 약 1.9% 차이를 보였다. 본 연구 방법은 선질보정인자를 독립적으로 결정하는 방법의 하나로서 프로토콜에서 주어진 값들의 확인이 필요하거나 또는 새로운 모델의 전리함을 사용하는 경우에 응용될 수 있다.
Abstract
The quality correction factor for used beam and qualities is strongly required for clinical dosimetry by TRS-398 protocol of IAEA. In this study the quality correction factors for a commercial plane-parallel ionization chamber in high energy electron beams were calculated by Monte Carlo code(DOSRZnrc/ EGSnrc). In comparison of quality correction factor, the difference between this study and TRS-398 were within 1% in 5-20MeV. In case of 4MeV the difference was 1.9%. As an independent method of determination of quality correction factor this study can be applied to evaluate values in the protocol or calculate the factor for a new chamber.
참고문헌 (8)
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