Directional dependence of radiation fluence from 192Ir and 198Au sources. Academic Article uri icon

Overview

abstract

  • Radiation fluence distribution around 192Ir and 198Au seeds of the type used for brachytherapy application was measured using a NaI crystal connected to a multi-channel analyzer. The radiation fluence, determined as a function of the angle between the seed axis and the direction of detection, is anisotropic with the fluence along the seed axis amounting to 78% of that perpendicular to the seed axis for seeds of both isotopes. The region of fluence reduction is broader for 198Au seeds, extending from 0-45 degrees; for 192Ir the decrease in fluence is evident for angles of 0-20 degrees. Integration of the angular distribution over 4 pi geometry indicated the effective activity of the implants to be 4% and 1% less than the nominal activity for the 198Au and 192Ir seeds, respectively, based on calibration measurements perpendicular to the seed axis.

publication date

  • March 1, 1983

Research

keywords

  • Brachytherapy
  • Gold Radioisotopes
  • Iridium
  • Radioisotopes

Identity

Scopus Document Identifier

  • 0020701223

PubMed ID

  • 6828694

Additional Document Info

volume

  • 146

issue

  • 3