Environmental Protection Agency (EPA) Lead Risk Assessor Practice Exam

What is a common method used to test for lead in paint?

1. Dust wipe sampling

2. XRF (X-ray fluorescence)

3. Soil testing

4. Water inspection

The correct answer is: XRF (X-ray fluorescence)

X-ray fluorescence (XRF) is a commonly used method to test for lead in paint due to its non-destructive nature and speed. XRF works by directing a small amount of x-ray radiation at the surface of the paint. When lead is present, it emits secondary x-rays that can be detected and quantified. This technique provides immediate results, allowing for quick assessments of lead levels in various types of paint, especially in homes built before the 1978 ban on the use of lead-based paints in residential properties. While methods such as dust wipe sampling, soil testing, and water inspection can be important in assessing overall lead exposure risk, they do not directly analyze the presence of lead in paint. Dust wipe sampling measures lead particles that may have settled on surfaces, which could come from various sources, not just paint. Soil testing assesses lead in the soil, which can indicate previous lead contamination from sources like paint, but again focuses on a different medium. Water inspection is aimed at lead that may leach from plumbing systems and does not pertain to paint. Therefore, XRF stands out as the optimal choice for testing lead specifically in paint.