The AAPM, through its Brachytherapy Subcommittee, has determined that the following brachytherapy source models comply with the AAPM’s dosimetric prerequisites as set forth in one of two publications: "Dosimetric prerequisites for routine clinical use of new low-energy photon interstitial brachytherapy sources: Recommendations of the American Association of Physicists in Medicine Radiation Therapy Committee". Med. Phys. 25, 2269-2270 (1998), or “Dosimetric prerequisites for routine clinical use of photon emitting brachytherapy sources with average energy higher than 50 keV," Med. Phys. 34, 37-40 (2007). The manufacturers must also satisfy criteria established by the AAPM Subcommittee on Calibration Laboratory Accreditation and described in a publication (hereafter referred to as “the 2004 CLA Report”): “Procedures for establishing and maintaining consistent air-kerma strength standards for low-energy, photon-emitting brachytherapy sources: Recommendations of the Calibration Laboratory Accreditation Subcommittee of the American Association of Physicists in Medicine”. Med. Phys., 35 671-685 (2004). The criteria are summarized here.