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TG-43 Formalism
Rivard et al. Update of AAPM Task Group No. 43 Report: A revised AAPM protocol for
brachytherapy dose calculations. Med Phys 2004
Sk: Air-Kerma-Strength
: Dose-Rate constant
GL: Geometry function
gL : Radial Dose function
F: Anisotropy function