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Electron beam
Photon beam
4. D
w
(i) =
f
-1
(OD(i))
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
Dose [Gy]
net Optical Density [-]
small pieces of film irradiated with various doses in
the same conditions
f
f is determined experimentally
- f is ‘sensitometric curve’
- corrects for film non-linearity
Determine dose D
w
(i
) in water
: