Which statement is true about fixed contamination measurement?

• A. Direct survey/frisking is used
• B. Wiping the surface is used for fixed contamination
• C. Directing HEPA discharge is used to measure fixed contamination
• D. Contaminated items should be bagged and tagged is the measurement method

Answer: (A)

Fixed contamination is contamination that stays attached to a surface and isn’t removed by ordinary cleaning. To assess it, you use a direct survey with a contamination monitor (a frisker or handheld survey meter) and scan the surface. This directly measures the activity on the surface without removing material, which is exactly what fixed contamination requires. Wiping the surface, by contrast, is used to evaluate removable contamination because it collects material that can be wiped away. The other choices describe actions that aren’t measurement methods for fixed contamination: directing HEPA discharge relates to filtration, not measurement, and bagging and tagging items is about handling and accountability, not measuring surface contamination.