CDPH Lead Inspector/Assessor California State Practice Exam

In what order should XRF or dust wipe collection be performed?

1. Dust wipe collection first

2. XRF first

3. No specific order

4. It depends on the situation

The correct answer is: XRF first

The appropriate order to perform XRF (X-ray fluorescence) testing and dust wipe collection is to conduct XRF first. The rationale behind this sequence is rooted in the methodologies associated with lead assessment and analysis. When XRF testing is performed prior to dust wipe collection, it allows for immediate and non-destructive detection of lead in paint, substrate, or other surfaces. This immediate analysis provides valuable information that can guide the inspection process, including identification of lead sources and determination of which surfaces might warrant further testing through surface wipes. Additionally, completing XRF before dust wipes means that the lead sources identified can be quickly documented and correlated with dust levels if significant lead concentrations are found. This systematic approach ensures that the inspection is thorough and follows best practices recommended for lead hazard assessments. Collecting dust wipes after XRF testing can also help in establishing a clearer picture of how lead dust may be present in the environment and related to any lead-based materials identified through the XRF process. This is particularly useful in assessing the extent of lead contamination and effectively managing any hazards present. Overall, performing XRF first lays the groundwork for a more informed and comprehensive assessment, thereby optimizing the approach to lead safety and remediation efforts.