Calibration checks for the XRF should be performed at what frequency during fieldwork?

Calibration checks for the XRF should be performed at what frequency during fieldwork?

• A. Every 4 Hours, Beginning and Ending of Inspection
• B. Daily
• C. Every 2 Hours
• D. Weekly

Answer: (A)

XRF readings can drift during fieldwork because environmental conditions, battery state, and instrument wear can affect accuracy. To keep measurements trustworthy, you verify the instrument with a calibration check at the start of the inspection, then perform a check at regular intervals during the day, and again at the end. Doing it every four hours plus at the beginning and end catches drift promptly without slowing work too much, which is why this frequency is the best choice. Daily, every two hours, or weekly checks either miss drift or impose unnecessary burden, making them less reliable for field conditions.

XRF readings can drift during fieldwork because environmental conditions, battery state, and instrument wear can affect accuracy. To keep measurements trustworthy, you verify the instrument with a calibration check at the start of the inspection, then perform a check at regular intervals during the day, and again at the end. Doing it every four hours plus at the beginning and end catches drift promptly without slowing work too much, which is why this frequency is the best choice. Daily, every two hours, or weekly checks either miss drift or impose unnecessary burden, making them less reliable for field conditions.