Dose 2016

Collimator leakage - intraleaf and interleaf

1. Two effects: • Diffused dose from spiky interleaf fluence leakage • Intraleaf attenuation

Intraleaf leakage very small:

µ

t

ρ ρ − ⋅

0.0408 18.0 8.0 − × ×

e

e

0.28%

→

=

8 cm tungsten at 3 MeV

Measuements from Arnfield et al , 2000 Med. Phys. 27

8