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Example: distance scaling for Plastic Water DT (PWDT)
PWDT
refw,
,
PWDT
w
w
PWDT
PWDT
c
z
z
z
z
c
eqs
= ⇒ ≈
=
ρ
µ
ρ
µ
983 .0
PWDT
=
c
At the depth of 5cm:
Derivation of formalism to convert ionisation in plastic to dose to water
Distance scaling in a clinical beam
The water equivalent distance
of 5cm PWDT is 4.92cm
and
NOT
:
963 .0
PWDT e,
=
ρ