Loose-fitting facepiece means a respiratory inlet covering that is designed to form a partial seal with the face.
Loose-fitting facepiece means a respiratory inlet covering that is designed to form a partial seal with the face. "Lost or missing source of radiation" means licensed [or registered] source of radiation whose location isunknown. This definition includes, but is not limited to, radioactive material that has been shipped but has notreached its planned destination and whose location cannot be readily traced in the transportation system. "Major processor" means a user processing, handling, or manufacturing radioactive material exceeding Type Aquantities as unsealed sources or material, or exceeding 4 times Type B quantities as sealed sources, butdoes not include nuclear medicine programs, universities, industrial radiographers, or small industrial programs. Type A and B quantities are defined in T.2 of these regulations.