What explicitly is required for licensee calibration measurements of sources to be used for manual brachytherapy?
The requirements for licensees doing calibration measurements of brachytherapy sources are contained in 10 CFR § 35.432. The licensee doing such measurements must (1) determine the source output or activity using a dosimetry system that meets the requirements of § 35.630(a) and (2) use a published protocol that is currently accepted by a nationally recognized body. Refer to “Supplementary Information,” Section III, “Summary of Public Comments and Responses to Comments” for 10 CFR § 35.432, as published in the Federal Register on April 24, 2002. Do licensees have to independently verify the output or activity of their brachytherapy sources (Cs-137, Ir-192, I-125, Pd-103) to make sure the information supplied by the manufacturers of these sources is correct? If so, do licensees have to verify each individual brachytherapy source or is an assay of, say, 10% good enough? [10 CFR 35.432, 35.630(a)] (Q&A ID 0802001) For the first medical use of a brachytherapy source on or after October 24,
