PROPERTIES OF THE 18 MV PHOTON BEAM FROM A VARIAN CLINAC 2100C LINEAR ACCELERATOR

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  • Varian 社製 Clinac 2100C 18 MV photon beam の特性

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Dosimetry data are presented for the 18 MV photon beam of a Varian Clinac 2100C dual energy linear accelerator. The clinical parameters of tissue-peak ratio (TPR), buildup region and surface dose, beam flatness and symmetry, isodose curves, dose rate dependence are discussed to 18 MV photon beam data. For the dose distribution of parallel opposed field with 18, 6, 10 MV related to this paper. We obtained 0.782 for the ionization ratio and 18.1 MV for the nominal energy with AAPM guidelines. Depth of the maximum dose for a 10×10cm^2 field at 100cm source-chamber distance (SCD) was 3.8cm. The relative surface dose increase with field size from 19.9% for a 5×5(cm)^2 field to 55.4% for a 40×40(cm)^2 field.

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