Section 35.2432 - Records of calibration measurements of brachytherapy sources(a) A licensee shall maintain a record of the calibrations of brachytherapy sources required by § 35.432 for 3 years after the last use of the source.(b) The record must include-(1) The date of the calibration;(2) The manufacturer's name, model number, and serial number for the source and the instruments used to calibrate the source;(3) The source output or activity;(4) The source positioning accuracy within the applicators; and(5) The name of the individual, the source manufacturer, or the calibration laboratory that performed the calibration. 67 FR 20370 , Apr. 24, 2002, as amended at 68 FR 19326 , Apr. 21, 2003