Which statement best describes why calibration verification is important before using a gauge?

• A. It ensures readings are accurate and within calibration limits.
• B. It is optional if the gauge looks clean.
• C. Calibration only matters for non-sealed sources.
• D. Calibration is done after each measurement.

Answer: (A)

Calibration verification before using a gauge checks that its current readings match a known reference within an allowed tolerance. This ensures the instrument will provide accurate, trustworthy results for safety decisions, regulatory reporting, and proper handling of radioactive materials. Gauges can drift over time due to aging, temperature changes, power or setup differences, so verifying against a standard keeps measurements reliable.

Even if the device looks clean, verification is still necessary to confirm accuracy. Calibration applies to sealed sources and non-sealed sources alike, and verification is typically done before use rather than after every measurement, since the goal is to confirm the instrument is ready to perform measurements correctly. If the verification falls outside the calibration limits, the gauge should be serviced or recalibrated before its readings are trusted.