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effective mass
attenuation
coefficients
depth scaling,
polyenergetic photon beam:
(
)
(
)
s
w
ref w,
eqs,
ρµ
ρµ
=
z
z
( )
(
)
ref
,
zz
e Az TPR
−
−
≈
ρ
µ
Depths in (g/cm
2
)
Derivation of formalism to convert ionisation in plastic to dose to water
Distance scaling in a clinical beam
depth
z
ref
where TPR is
normalised
field size
depth
s
refw,
eqs,
s
w
w
s
s
c
z
z
z
z
c
= ⇒ ≈
=
ρ
µ
ρ
µ
Depth scaling factor for the clinical beam: