330 / 1359
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
3
air ion chamber (PTW)
80/20%
Beam Profiles: Penumbra measurements
using detectors of different sizes
The volume effect