A radiological survey of all personnel that had recently used the vehicles and the craft worker's shop locations was performed. No contamination beyond limits was found. The direct cause of the contamination remains unknown. Since no contamination spread was detected on the workers, their clothing, or their work areas, the most likely source is a single particle of contamination that was transferred from a worker's shoe to the vehicle floor mat. The possibility of transport of the contamination off-site was also evaluated.
Workers wear company issued work clothing including shoes.
They change out of the company issued clothing at the end of shift, and also wash up including shower before leaving the site. In addition, two surveys were performed of the workers, their clothing, their work areas, and their locker area with no contamination found. The vehicles are surveyed before they are allowed to go off-site to any location other than another DOE site that is also a radiological control area. In addition, the lunchroom is subject to a monthly radiation survey and the locker room is subject to a quarterly survey. No contamination spread has been found from these surveys.