Monte Carlo characterization of the M-19 high dose rate Iridium-192 brachytherapy source.

The MCNP5 Monte Carlo code was used to simulate the dosimetry of an M-19 iridium-192 high dose rate brachytherapy source in both air/vacuum and water environments with the in-air photon spectrum filtered to remove low-energy photons below δ=10 keV. Dosimetric data was organized into an away-along table and was used to derive the updated AAPM Task Group Report No. 43 (TG-43U1) parameters including SK, D(r,θ), Λ, gL(r), F(r,θ), [lowercase_phi_synonym]an(r), and <OVERLINE>[lowercase_phi_synonym]</OVERLINE>an and their respective statistical uncertainties. [ABSTRACT FROM AUTHOR]