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6~18MeV의 에너지를 갖는 전자선의 등흡수선량 분포
김수길 고신대학교 의학부 1986 高神大學校 醫學部 論文集 Vol.2 No.1
Isodose distributions from radiotherapy electron beams of energy 6 to 18MeV from Nelac 1018 medical linear accelerator have been measured in water phantom by ionization chamber and Fujitec FM0036 three dimensional isodose plotter. The isodose curve graphs and data are presented and compared for beams of various energies and field sizes. The effect of field size is discussed. Contamination of the electron beam by X-rays, checking the output, flatness, collimation, symmetry of the electron beams are described.
전자선의 흡수선량과 output factor에 대한 field size의 효과
김수길 고신대학교 의학부 1986 高神大學校 醫學部 論文集 Vol.2 No.1
Linac 18 medical linear accelerator produces electron beams of 6, 9, 12, 15, and 18 MeV. We measured electron beam depth dose and output factors for various fields using an ionization chamber. The electron fields were 5, 7, 10, 12, 15, and 20㎝ squares. Several features common to all beam energies can be observed as the area of the treatment field becomes smaller. They are (1) the depth of maximum dose(d_(max)) shift towards the surface, (2) the depth of the 80% isodose line becomes smaller, (3) the fall-off region of the curve becomes less steep, (4) the practical range of the beam(Rp) remains constant. Electron beam output factors as a function of field size are shown in the graphs and the tables generated from these measurements