THE CORRECTION OF ELECTRON OUTPUT AT EXTENDED SSD
Abstract
Correction of electron output at extended treatment distance in Mitsubishi ML- 15 MIII Linear Accelerator that available with the solid closed-sided applicator was performed. Comparison of electron outputs from inverse square law (ISL) correction with the outputs from direct measurement in electron field 4x4 to 14x14 cm’, 101-115 cm SSDs with energies at 8,10,12, and 15 MeV revealed that ,with a nominal SSD ,the ISL calculation will provide the corrected output that fitting within ±3 % of the measured output if the field size is equal to or larger than 10x10 cm2 in all gaps and all energies. While with the effective SSD, the calculated outputs were found to agree with all the measured doses in all field sizes, all SSDs, and all energies in the study.
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