If an XRF reading is 0.8 mg/cm2 on all tested locations, classification?

If an XRF reading is 0.8 mg/cm2 on all tested locations, classification?

• A. Positive.
• B. Inconclusive.
• C. Negative.
• D. Not testable.

Answer: (C)

In lead paint assessments, the XRF screening uses an action level of 1.0 mg/cm2. If a reading is at or above this level, the surface is considered to contain lead-based paint (positive). If a reading is below 1.0 mg/cm2, it is not considered lead-based paint above the threshold (negative). Since the measurement is 0.8 mg/cm2 at all tested locations, every reading is below the action level. Therefore, the surfaces are classified as negative for lead-based paint.

In lead paint assessments, the XRF screening uses an action level of 1.0 mg/cm2. If a reading is at or above this level, the surface is considered to contain lead-based paint (positive). If a reading is below 1.0 mg/cm2, it is not considered lead-based paint above the threshold (negative).

Since the measurement is 0.8 mg/cm2 at all tested locations, every reading is below the action level. Therefore, the surfaces are classified as negative for lead-based paint.