Effects of changes in stopping-power ratios with field size on electron beam relative output factors.

@article{Zhang1998EffectsOC,
  title={Effects of changes in stopping-power ratios with field size on electron beam relative output factors.},
  author={Guanghua G. Zhang and D. W. O. Rogers and Joanna E Cygler and Thomas Rock Mackie},
  journal={Medical physics},
  year={1998},
  volume={25 9},
  pages={1711-6}
}
Stopping-power ratios are a function of field size and vary with accelerators. To investigate how these variations affect relative output factor measurements made using ion chambers for electron beams, especially for small fields, (L/rho)air(water) is calculated using the Monte Carlo technique for different field sizes, beam energies, and accelerators and is compared to the data in TG-21 or TG-25, which are for mono-energetic broad beams. For very small field sizes defined by cutouts, if the… CONTINUE READING

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