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Model equation to determine water absorbed dose:
M*
Reading of the dosimeter
M
0
Reading due to leakage current,
N
Calibration factor in terms of absorbed dose to water
k
air density correction factor
k
s
Factor to correct the response of an ionization chamber for the lack of
complete charge collection (due to ion recombination).
k
p
Factor to correct the response of an ionization chamber for the effect of a
change in polarity of the polarizing voltage applied to the chamber.
k
Q
beam quality correction factor
25
Example: Determine the uncertainty of a dose
determination under reference conditions
Q
p
s
w
k
k
k
k
N
M
M
D
−
=
)
*
(
0