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2D Anisotropy Function
slide courtesy of Luc Beaulieu
•
F
(
r
,
θ
) is always unity for a perfect point source
•
F
(
r
,
θ
) = 1 at
θ
0
•
F
(
r
,
θ
) accounts for dose-rate variation over angles due to
differing attenuation by source capsule, internal components, …
• Must know source orientation use 2D formalism
– otherwise, use the 1D formalism