546-547 / 2239
( )
s
w
s
we
vs
ρ
µ
ρ
Derivation of formalism to convert ionisation in plastic to dose to water
Derivation of depth (distance) scaling factor
Fujita etal 2010 Radiat. Res. 51 707-
Ratio of electron densities
good approximation
for 4MV.
For some materials energy
dependence up to 4%
For the clinical x-ray
beams scaling by the
electron density ratio is not
a good approximation.