Dose Course Book

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6 MV, 30 cm depth

Beam Profiles: Penumbra measurements

using detectors of different sizes

The volume effect

31002 is a 125 mm

3

air ion chamber (PTW)

80/20%

Krauss [20]

Penumbra widening due to

overestimated beam tails

(scattered radiation outside

beam – energy dependence)