CPB Budapest 2017

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Dose calculation – AAPM-TG43: The Anisotropy Function F(r, θ):
F(r, θ): The anisotropy function that considers the effect of absorption
and scatter of the photons within the source active core and
encapsulation material as well as part of the driving cable if any.
F(r, θ) is a dimensionless quantity.
It is always F(r, θ=900) = 1.00
F(r, θ) depends in general on source ! F(r, θ)
design and radionuclide.