What is the correct standard value that indicates lead is present in a positive XRF reading?

The standard value that indicates lead is present in a positive XRF (X-ray fluorescence) reading is 1.0 mg/cm². This threshold is significant because it helps to determine the presence of lead-based paint in various environments, particularly in homes and structures where the risk of lead exposure is a concern, especially for children.

A reading of 1.0 mg/cm² signifies that the surface emits enough lead signals to potentially pose a health risk, necessitating further assessment or remediation. It's essential for lead risk assessors to recognize this standard in order to properly evaluate lead hazards and ensure compliance with safety regulations. By understanding this value, assessors can make informed decisions regarding lead management and protect public health effectively.