Applicator 3 cm circle lead c/o 2 cm circle + s/o 0.5 cm

80 kV (HVL 2.0 mm Al) 15 cm FSD 4.5 Gy per fraction

Using data from tables, including backscatter factor (BSF) for size of the applicator/treatment area/surface dose rate, treatment times can be calculated:

  • Surface dose rate 2.81 Gy/min (SDR)
  • % dd: 100%
  • BSF 3 cm App: 1.14
  • BSF 2 cm c/o: 1.11
  • Stand off correction factor: 0.94

The values used above are taken from tabulated data; Dobbs, Barrett & Ash (2009).

Calculation:

Example Stand Off Calculation
Example Stand Off Calculation with values taken from tabulated data, Dobbs Barrett & Ash (2009)

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