When should you calibrate your XRF?

Calibrating your X-Ray Fluorescence (XRF) instrument is crucial to ensure accurate readings when assessing lead levels in painted surfaces or dust samples. Calibration involves adjusting the device so that it can produce reliable measurements, reflecting true lead concentrations.

The correct choice emphasizes that calibration should occur at the start of the inspection, every four hours during the inspection, and at the end. This practice is important for maintaining the instrument's accuracy throughout its use. By conducting initial calibration, you establish a baseline measurement. Frequent recalibration every four hours ensures that any drift in the measurement accuracy due to environmental changes or the condition of the instrument is addressed. Finally, calibrating again at the end of the inspection helps confirm that the readings obtained were accurate and reliable throughout the testing process.

This systematic approach to recalibration aligns with industry standards and best practices, minimizing the risk of false readings that could lead to improper conclusions about lead exposure risk. Regularly calibrating the XRF throughout the inspection helps maintain integrity and reliability in lead assessments.