Physical factors affecting absorbed dose to the skin from cobalt-60 gamma rays and 25-MV x rays.

@article{Gagnon1979PhysicalFA,
  title={Physical factors affecting absorbed dose to the skin from cobalt-60 gamma rays and 25-MV x rays.},
  author={William F. Gagnon and John L. Horton},
  journal={Medical physics},
  year={1979},
  volume={6 4},
  pages={
          285-90
        }
}
When there is an absence of scattering material adjacent to the skin on the exit side of a megavoltage beam the dose to the skin is less than would be calculated using depth dose tables or isodose distributions measured in "semi-infinite" phantoms. Ionization measurements using a thin-window parallel-plate chamber show that the dose at 4 mg/cm2 from the exit surface is 14% to 16% less for cobalt-60 gamma rays and about 8% less for 25-MV x rays compared to the dose with full backscatter. As the… CONTINUE READING

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