If an XRF classification result is inconclusive, what should be done next?

When an XRF (X-ray fluorescence) classification result is inconclusive, conducting a paint chip sample is a recommended next step. This approach allows for the collection of actual paint samples from the site in question, which can then be analyzed in a laboratory setting. A laboratory analysis can provide more definitive results regarding lead content, as it often utilizes more sensitive and precise testing methods compared to a handheld XRF device.

Selecting this option helps in ensuring that any potential lead hazards are addressed appropriately and that conclusions are based on reliable data. Paint chip sampling is particularly valuable in instances where XRF readings may be influenced by factors such as surface dirt, paint layering, or instrument calibration issues.

Other potential follow-up actions, like ignoring the result, would neglect the possibility of a lead hazard and could lead to health risks. Retesting with a different model might not resolve the issue if the initial reading was affected by other external factors. While performing a visual assessment can help in understanding the condition of the painted surfaces, it will not provide definitive information about lead content as can be gathered through laboratory analysis of paint samples. Thus, conducting a paint chip sample directly addresses the need for clarity on the lead presence or absence in the evaluated area.