Physics Bucharest 2017

Photon beam

Electron beam

The more ‘black’, the higher the dose deposited in film

Determine dose D w 1. measure I(i) and I 0

(i ) in water :

(i) with densitometer

2. Transmission T(i)=I(i)/I 0 (i) 3. calculate OD net

: OD(i)= 10 logT(i) – OD fog