540-541 / 2239
Depth scaling, from exponential attenuation law,
for a monoenergetic photon beam and when Compton interactions dominates
:
( )
s
ρ
µ
µ
∝ =
=
Derivation of formalism to convert ionisation in plastic to dose to water
Derivation of depth scaling factor
(
)
ww
z
o
w
e
ρµ
−
Φ=Φ
(
)
s s
z
o
s
e
ρµ
−
Φ=Φ
in water
in solid phantom
we s
s
w s
w
s
s
w
µ
z
z
z z
(
)
cm in z
(
)
(
)
( )
s
we s
s
w
s
w
s
s
w
z
z
z z
ρ
ρ
µ
ρµ
ρµ
∝
=
=
(
)
2
cmg in z
depth scaling
factor