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Distance scaling (range-scaling factor)
we,
eqs,
eqs,
ρ
= =
r
z
Field size (radius)
depth [cm]
electron density in terms of
electrons/g
Derivation of formalism to convert ionisation in plastic to dose to water
Derivation of depth scaling factor
se,
ref w,
ref w,
ρ
r
z
Valid when mass attenuation coefficient proportional to electron density. i.e mono-energetic beams and
low energy MV beams