Section 35.432 - Calibration measurements of brachytherapy sources(a) Before the first medical use of a brachytherapy source on or after October 24, 2002, a licensee shall have-(1) Determined the source output or activity using a dosimetry system that meets the requirements of § 35.630(a) ;(2) Determined source positioning accuracy within applicators; and(3) Used published protocols currently accepted by nationally recognized bodies to meet the requirements of paragraphs (a)(1) and (a)(2) of this section.(b) Instead of a licensee making its own measurements as required in paragraph (a) of this section, the licensee may use measurements provided by the source manufacturer or by a calibration laboratory accredited by the American Association of Physicists in Medicine that are made in accordance with paragraph (a) of this section.(c) A licensee shall mathematically correct the outputs or activities determined in paragraph (a) of this section for physical decay at intervals consistent with 1 percent physical decay.(d) A licensee shall retain a record of each calibration in accordance with § 35.2432 . 67 FR 20370 , Apr. 24, 2002, as amended at 68 FR 19325 , Apr. 21, 2003