Dosimetry calculations for concentric cylindrical source and target regions with application to blood vessels

Abstract

Geometry factors are derived for source and target regions consisting of concentric circular cylinders and cylin-drical shells. Line-source kernels are derived from point kernels for monoenergetic electrons and photons. The geometry factors and line-source kernels are then combined to yield electron and photon absorbed fractions that, in turn, are used to calculate conversion factors for dose rates in blood vessel walls from radionuclides in the blood. Example calculations are presented for selected radionuclides and for blood vessels of three representative sizes. © 1992 Health Physics Society Pergamon Press plc.