Physics Bucharest 2017

Photon beam

Electron beam

small pieces of film irradiated with various doses in the same conditions

1.8

1.6

1.4

1.2

1

0.8

f

0.6

0.4

0.2

net Optical Density [-]

0

0

0.1

0.2

0.3

0.4

0.5

0.6

0.7

Dose [Gy]

Determine dose D w

(i ) in water :

- f is ‘sensitometric curve’ - corrects for film non-linearity

4. D w

(i) = f -1 (OD(i))

f is determined experimentally