ESTRO course Dose Modelling and Verification 2017

Krauss [20]

6 MV, 30 cm depth

Penumbra widening due to

overestimated beam tails

(scattered radiation outside beam

– energy dependence)

31002 is a 125 mm

air ion chamber (PTW)

80/20%

Beam Profiles: Penumbra measurements

using detectors of different sizes

The volume effect