TY - JOUR AU - J Williamson AU - Bert Coursey AU - Larry DeWerd AU - W Hanson AU - Ravinder Nath AU - Geoffrey Ibbott C2 - Medical Physics DA - 1999-01-01 00:01:00 LA - en M1 - 26 PB - Medical Physics PY - 1999 TI - Guidance to Users of Nycomed-Amersham and North American Scientific 125I Interstitial Sources: Dosimetry and Calibration Changes: Recommendations of the American Association of Physicists in Medicine Radiation Therapy Committee Ad Hoc Subcommit ER -