CDPH Lead Inspector/Assessor California State Practice Exam

How are XRF results classified?

1. Positive, negative, or uncertain

2. Positive, negative, or inconclusive

3. Definite, probable, or unlikely

4. Confirmed, uncertain, or dismissed

The correct answer is: Positive, negative, or inconclusive

XRF results, which come from X-Ray Fluorescence testing, are classified as positive, negative, or inconclusive based on the presence and quantity of lead detected in a given sample. A positive result indicates that lead has been detected at levels above regulatory thresholds, suggesting a potential health risk and the need for further action. A negative result signifies that no significant lead has been found, typically indicating safety in that area regarding lead exposure. The term inconclusive is used when the results do not clearly indicate a strong positive or negative finding, possibly due to factors like interference or the sample's inconsistency. This classification system is important for analyzing potential lead hazards in various environments, as it guides decision-making for remediation and safety assessments. The presence of the word "inconclusive" in the selected answer reflects the reality of testing where results may lead to further investigation rather than clear-cut conclusions, thus providing a clearer understanding of potential risks associated with lead exposure.