Which of the following is NOT a type of surface contamination?

Surface contamination refers specifically to the presence of radioactive materials on surfaces, which can pose risks of exposure and require distinct management and decontamination strategies. Loose contamination is characterized by materials that can easily be disturbed or removed from a surface, such as dust or particles. Fixed contamination, on the other hand, represents radioactive materials that have adhered strongly to a surface, making them more challenging to remove. Discrete (hot) particles refer to specific, localized areas of contamination where small pieces of radioactive material are present.

Liquid contamination, however, does not fit into the category of surface contamination in the same way. While radioactivity can certainly be found in liquid form, it typically pertains to substances that are spilled or contained in liquid form rather than adhering to solid surfaces. The management of liquid contamination involves different considerations and procedures compared to managing solid surface contamination. Therefore, liquid contamination stands apart as it is primarily associated with spilled substances or solutions, rather than contamination that is affixed to solid surfaces.