How is compliance for XRF calibration verified?

Compliance for XRF (X-ray fluorescence) calibration is verified by comparing to the Performance Characteristic Sheet (PCS) for compliance. The PCS is a critical document that outlines the specific performance requirements and thresholds for XRF equipment under standard operating conditions. It typically includes details such as calibration standards, accuracy, precision, and detection limits.

By referencing the PCS, a risk assessor can ensure that the XRF equipment is functioning within the required parameters and meeting regulatory standards. This process is essential to confirm that the measurements produced by the XRF analyzer are reliable and valid for regulatory or analytical purposes.

In contrast, while periodic audits assess overall compliance of processes and procedures, they do not specifically focus on the calibration performance of the XRF equipment. Similarly, comparing qualifications of workers pertains more to the competence of personnel operating the equipment rather than the calibration itself. Historical data may provide insight into past performance but does not serve as a definitive compliance verification tool for current calibration standards. Therefore, the comparison to the PCS is the most direct and relevant method for ensuring compliance regarding XRF calibration.