What is the most likely reason for raised levels of lead in the blood of those working with sheet lead?

The most likely reason for raised levels of lead in the blood of those working with sheet lead is related to the failure to wash hands before eating. Lead exposure can occur through ingestion, particularly when contaminated hands or surfaces are involved. If workers do not wash their hands adequately, lead particles can easily transfer from their fingers to their food, which is a common route for lead entering the body.

Hand hygiene is critical in any setting involving hazardous materials. Workers may come into contact with lead dust or particles throughout their tasks, and if they then eat or touch their mouth without washing, they can ingest lead, resulting in elevated blood lead levels.

While inadequate ventilation and failure to use protective equipment, such as face masks, can also contribute to overall lead exposure, they do not directly relate to the ingestion pathway as strongly as not washing hands. Protective gloves may help reduce skin exposure, but they do not replace the need for thorough handwashing before meals.