title: Validity of the interval method for the determination of the anisotropy factor of high dose rate 192Ir sources.
abstract: OBJECTIVE
  This study investigates the validity of the interval method to determine the anisotropy factors of high dose rate (HDR) 192Ir sources.
  
  
  METHODS
  A calculation method, which is one of the various numerical implementations of the Sievert integral and known as the interval method, is applied to determine the anisotropy factors of a HDR 192Ir source. Calculated results from r = 1 cm to 10 cm are compared to published data.
  
  
  RESULTS
  The comparison shows that the error resulting from the interval method increases from 1.3 to 28.1% as the radial distance increases from r = 1 cm to 10 cm and is significantly smaller than that previously reported.
  
  
  CONCLUSIONS
  The interval method might be considered as a method that provides a very rough estimate of the anisotropy of HDR 192Ir sources whenever no conclusive anisotropy data is available.
authors.affiliation: Department of Nuclear Engineering, Texas A&M University, College Station 77843-3133, USA.
authors.forename: S H
authors.initials: SH
authors.lastname: Cho
authors.forename: R
authors.initials: R
authors.lastname: Muller-Runkel
mesh_terms: D001918:Brachytherapy; D007496:Iridium Radioisotopes; D009010:Monte Carlo Method; D011874:Radiometry / Q000379:methods*; D015203:Reproducibility of Results; D014867:Water
chemical_list: D007496:Iridium Radioisotopes; D014867:Water