Which testing method uses a handheld device to measure lead content in coatings?

• A. X-ray fluorescence (XRF) spectroscopy.
• B. Laboratory chemical analysis.
• C. Visual assessment.
• D. Thermography.

Answer: (A)

X-ray fluorescence (XRF) spectroscopy uses a handheld analyzer to measure lead content in coatings on-site. The device emits X-rays that excite atoms in the paint; the atoms emit characteristic X-rays as they return to lower energy states, and the instrument detects these signals to quantify how much lead is present, usually in parts per million or percent by weight. This approach is non-destructive and gives immediate results, so inspectors can screen surfaces without sampling or lab work and determine if the coating exceeds regulatory thresholds (such as 0.5% lead by weight). Other methods require sending samples to a lab or don’t measure lead content at all, like visual assessment or thermography which assess appearance or temperature rather than lead levels.