What statement about XRF instrument features is accurate?

What statement about XRF instrument features is accurate?

• A. XRF instruments do not require any calibration.
• B. They use a fixed range only; no calibration checks.
• C. A performance characteristics sheet determines calibration check tolerances.
• D. XRF instrument features vary by manufacturer.

Answer: (C)

Calibration and performance verification are about ensuring an XRF instrument gives trustworthy results by checking its response against defined limits. The document that guides this is the performance characteristics sheet from the manufacturer, which specifies the tolerances for calibration checks across the instrument's measurement ranges. These tolerances tell you how close your daily or routine calibration results must be to the reference values, and what to do if they drift. Because of that, the most accurate statement is that a performance characteristics sheet determines calibration check tolerances. This is why daily checks use standard references, and if results fall outside the tolerances, you recalibrate or service the instrument. It is not true that calibration is unnecessary, and it is not correct to claim there are no calibration checks. While instrument features do vary by manufacturer, the defining point for calibration checks is the tolerances laid out in the performance characteristics sheet.

Calibration and performance verification are about ensuring an XRF instrument gives trustworthy results by checking its response against defined limits. The document that guides this is the performance characteristics sheet from the manufacturer, which specifies the tolerances for calibration checks across the instrument's measurement ranges. These tolerances tell you how close your daily or routine calibration results must be to the reference values, and what to do if they drift. Because of that, the most accurate statement is that a performance characteristics sheet determines calibration check tolerances. This is why daily checks use standard references, and if results fall outside the tolerances, you recalibrate or service the instrument. It is not true that calibration is unnecessary, and it is not correct to claim there are no calibration checks. While instrument features do vary by manufacturer, the defining point for calibration checks is the tolerances laid out in the performance characteristics sheet.