Calibration of 125I brachytherapy sources in terms of reference air kerma rate

  • H. -J. Selbach
Conference paper
Part of the IFMBE Proceedings book series (IFMBE, volume 25/1)


Since 2008 the Physikalisch-Technische Bundesanstalt (PTB) has, as the second National Primary Laboratory in the world and the first in Europe, been offering the calibration of 125I-brachytherapy sources (so-called prostate seeds) in terms of the quantity reference air kerma rate (RAKR). The primary standard used, a large air-filled parallel-plate extrapolation chamber with thin graphite front and back electrodes is presented, and the calibration process, including anisotropy and spectral photon distribution measurements are described. An uncertainty budget for the calibration, dependent on the properties of the source to be measured, is given.


brachytherapy 125I source reference air kerma rate primary standard calibration 


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Copyright information

© Springer-Verlag Berlin Heidelberg 2009

Authors and Affiliations

  • H. -J. Selbach
    • 1
  1. 1.Physikalisch-Technische BundesanstaltBraunschweigGermany

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