Geometry function of a linear brachytherapy source

Abstract

An equation is derived for the TG43 geometry function, G(r,), of a linear brachytherapy source in terms of its active length. This equation is validated by comparison to published values. It is then used to calculate values of the geometry function for the Model 200 103Pd seed, which is a segmented linear source. 2001 American College of Medical Physics.