Dose 2016

Measurements under non-reference conditions: Output factors

Large fields:

Changes in photon fluence in the beam axis.

More low energy photons.

Air vented ion chamber:

f

(A

)= f

(A) = S

Q

ref

Q

w,air

Diode:

Burlin cavity theory:

f = d·S +(1-d) · [μ /ρ] , Q w,med

en w silicon

H

0

2

[μ

/ρ]

,

for A and A ref differ

en

w

silicon

output factors