900.12(e)(12): Calibration of air kerma measuring instruments. 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 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 ±6 percent (95 percent confidence level) in the mammography energy range.
- What are the physicists' responsibilities with respect to the requirement for calibration of their air kerma measuring instruments?
- How should the physicist indicate to the mammography facility that the air kerma measuring instrument has met the requirement?
- A physicist utilizes a calibration laboratory after it has been notified by the National Institute of Standards and Technology (NIST) that it has failed its latest proficiency test. Can those calibrated instrument be used for MQSA evaluations?