How often must XRF calibration checks be performed?

How often must XRF calibration checks be performed?

• A. Beginning and ending of inspection
• B. Every 4 hours
• C. Daily
• D. Weekly

Answer: (B)

Regular calibration verification is essential for XRF testing because the instrument’s accuracy can drift during a field session due to temperature changes, high‑voltage fluctuations, or other environmental factors. Checking the calibration every four hours provides a timely safeguard that catches drift before many readings are taken, keeping results reliable throughout the inspection. Checks only at the start and end can miss drift that happens mid-inspection, and daily or weekly checks are too infrequent for ongoing field measurements. If a calibration check indicates drift beyond acceptable limits, recalibrate and re-check, and re-test any readings affected.

Regular calibration verification is essential for XRF testing because the instrument’s accuracy can drift during a field session due to temperature changes, high‑voltage fluctuations, or other environmental factors. Checking the calibration every four hours provides a timely safeguard that catches drift before many readings are taken, keeping results reliable throughout the inspection. Checks only at the start and end can miss drift that happens mid-inspection, and daily or weekly checks are too infrequent for ongoing field measurements. If a calibration check indicates drift beyond acceptable limits, recalibrate and re-check, and re-test any readings affected.