Dose calibrator response to brachytherapy sources: A Monte Carlo and analytic evaluation

Jeffrey F. Williamson, Richard L. Morin, Faiz M. Khan

Research output: Contribution to journalArticlepeer-review

17 Scopus citations


It is well known that the dose calibrator response/unit exposure rate depends significantly upon source energy. However, investigation of 137Cs, 192Ir, and 226Ra brachytherapy sources by empirical, analytical, and Monte Carlo techniques shows that source filtration significantly affects the calibrator reading to exposure rate conversion factor. The results demonstrate that for each clinically used filtration thickness an exposure calibrated standard source is required to establish the response of the well chamber. An interesting consequence of this analysis is that the Sievert point dose algorithm for clinical sources overestimates the dose on the order of 3% at distances of approximately 3.5 cm from the source.

Original languageEnglish
Pages (from-to)135-140
Number of pages6
JournalMedical physics
Issue number2
StatePublished - Mar 1983


  • attenuation
  • brachytherapy
  • calibration
  • cesium 137
  • design
  • dose response relationships
  • filtration
  • gamma radiation
  • gamma sources
  • iridium 169
  • irradiation devices
  • monte carlo method
  • photon transport
  • radiation doses
  • radium 226
  • stainless steels
  • thickness
  • transmission


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