CDPH Lead Inspector/Assessor California State Practice Exam

What constitutes a positive XRF result concerning lead levels?

1. Less than 0.5 mg/cm²

2. Greater than or equal to 1.0 mg/cm²

3. Between 0.5 mg/cm² and 1.0 mg/cm²

4. Exactly 1.0 mg/cm²

The correct answer is: Greater than or equal to 1.0 mg/cm²

A positive XRF (X-ray fluorescence) result for lead levels is indicated by a measurement that is greater than or equal to 1.0 mg/cm². This threshold is significant because it reflects the concentration of lead that poses a potential risk to health, especially in environments where lead exposure can occur, such as homes built before 1978 or during renovations. When the measurement is at or above this level, it triggers required actions such as further assessment, remediation, or compliance with regulatory standards regarding lead hazard control. Consequences associated with elevated lead levels include the need for appropriate safety measures to be implemented to protect occupants and workers from lead exposure, which can have serious health implications. The other ranges provided do not constitute a positive result, as levels below 0.5 mg/cm² are generally considered safe and unlikely to pose a risk, while levels between 0.5 mg/cm² and 1.0 mg/cm² typically indicate caution but do not automatically necessitate the same level of action required for results at or above 1.0 mg/cm². Thus, having a clear understanding of these thresholds is essential for lead inspectors and assessors in making informed evaluations of lead exposure risks.