391 / 1840
Dose calculation – AAPM-TG43
G(r,θ): The geometry function at radial distance r and polar angle θ. It is
a dimensionless quantity.
•
From a physics point of view the geometry function simply provides an
effective inverse square-law correction based upon the spatial
distribution of radioactivity within the source core.
•
It depends only on the 3D volume shape of the active core of the source
and not on the radionuclide, nor on the encapsulation!
•
It neglects scattering and attenuation!