Instruments used by medical physicists in their annual survey to measure the air kerma or air kerma rate from a mammography unit shall be calibrated at least once every two (2) years and each time the instrument is repaired. The instrument calibration must be traceable to a national standard and calibrated with an accuracy of plus or minus six percent (6%) (ninety-five percent (95%) confidence level) in the mammography energy range.
S.C. Code Regs. § 61-64.V.RHB 5.16