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Formalism to convert ionisation in plastic to dose to water
Dose at a point in water from an
MV photon beam
Photon energy fluence:
Ψ
Dose:
( )
( )
w
w
en
ref
ref
Qw,
β
ρ
µ
Ψ=
z
z D
collision kerma (K
c
)
CPE =1
TCPE scaling factor for high x-ray energies
w
β
Formalism in Dosimetry Code of Practice
for dose to water from a measurement in plastic
D
w
,
Q
z
ref
( )
=
M
s
,
Q
z
eq
( )
N
D,w,Q
o
k
Q,Q
o
k
w
,
s
Q
from dose to water formalism