Section 120.564 - Calibration Measurement of Brachytherapy Sealed Sources(A) Prior to the first medical use of a brachytherapy sealed source on or after October 6, 2006, a licensee shall perform the following:(1) Determine the source output or activity using a dosimetry system that meets the requirements of 105 CMR 120.575(A);(2) Determine source positioning accuracy within applicators; and(3) Use published protocols accepted by nationally recognized bodies to meet the requirements of 105 CMR 120.564(A)(1) and (2).(B) A 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 105 CMR 120.564(A).(C) A licensee shall mathematically correct the outputs or activities determined in 105 CMR 120.564(A) for physical decay at intervals consistent with 1.0% physical decay.(D) An authorized medical physicist shall perform or review the calculation measurements made pursuant to 105 CMR 120.564(A), (B), or (C).(E) A licensee shall retain a record of each calibration in accordance with 105 CMR 120.592(B).Amended by Mass Register Issue 1480, eff. 10/14/2022.