Report of the ad hoc committee of the AAPM radiation therapy committee on 125I sealed source dosimetry

H. Dale Kubo, Bert M. Coursey, William F. Hanson, Robert W. Kline, Stephen M. Seltzer, Ralph E. Shuping, Jeffrey F. Williamson

Research output: Contribution to journalArticle

32 Scopus citations


Purpose: Two developments in 125I-sealed source dosimetry have necessitated swift and accurate implementation of TG43 dosimetry in clinic: (a) the dosimetry constants of 125I endorsed by the AAPM Task Group 43 Report result in calculated dose rate that deviates by as much as 15% from currently accepted dose-rate distributions, and (b) The National Institute of Standards and Technology (NIST) has proposed modifying the 125I air-kerma strength standard by approximately 10%. Methods and Materials: The ad hoc committee of AAPM Radiation Therapy Committee describes specific procedures to implement these two developments without causing confusion and mistakes. Conclusions: Confusion and mistakes may be avoided when the following two general steps are taken: 1) STEP I, TG-43 implementation, and 2) STEP II, new air-kerma strength standard implementation when available from NIST.

Original languageEnglish
Pages (from-to)697-702
Number of pages6
JournalInternational Journal of Radiation Oncology Biology Physics
Issue number3
StatePublished - Feb 1 1998


  • Brachytherapy
  • Dose-rate constant
  • I Dosimetry

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