CDPH Lead Inspector/Assessor California State Practice Exam

How often must calibration of an XRF be conducted according to HUD Guidelines?

1. Every hour

2. Once a day

3. Every 4 hours

4. Every 8 hours

The correct answer is: Every 4 hours

Calibration of an X-ray fluorescence (XRF) device according to HUD Guidelines must occur every 4 hours during operation. This frequency ensures that the device maintains its accuracy and reliability in detecting lead levels in various materials. Regular calibration is essential for obtaining valid measurements, as it helps correct any potential drift in the instrument's readings over time. If calibration were conducted too infrequently, it could lead to inaccurate data, potentially compromising the safety and effectiveness of lead assessments. Thus, maintaining a 4-hour calibration interval enables professionals to have confidence in the results obtained from the XRF equipment.