Practice Test Geeks(NRRPT) National Registry of Radiation Protection Technicians Practice Test
← All NRRPT Flashcard Decks

Contamination and Airborne Control Flashcards

7 cards from real NRRPT practice questions. Tap to flip, then mark Knew It or Still Learning — missed cards come back until you master them.

Read the first 7 Contamination and Airborne Control flashcards as text

  1. Which particle size range is considered most hazardous for lung deposition from inhaled radioactive aerosols?

    Answer: 1–5 micrometers (AMAD)

    Particles in the 1–5 µm AMAD range penetrate into the pulmonary (alveolar) region of the lung where clearance is slowest and dose is highest.

  2. A High Efficiency Particulate Air (HEPA) filter is rated to remove what minimum percentage of 0.3-micron particles?

    Answer: 99.97%

    HEPA filters must remove at least 99.97% of particles at the most penetrating particle size of 0.3 µm per standard definitions (DOE/NRC requirements).

  3. What is the purpose of conducting a 'low-volume grab sample' for airborne radioactivity?

    Answer: Obtain a short-duration air sample to characterize airborne concentrations quickly during a specific task

    Grab samples collect air over a short period to characterize concentrations during a specific work evolution, providing rapid task-specific data.

  4. When using HEPA vacuums to clean up dry radioactive contamination, which practice is critical to prevent re-suspension?

    Answer: Pre-wet the surface with a fixative or water mist before vacuuming

    Pre-wetting or applying a fixative binds loose particles to the surface, reducing re-suspension during the vacuuming process.

  5. What does a DAC-hour represent in radiation protection practice?

    Answer: The product of airborne concentration in DAC units and the time in hours of exposure

    A DAC-hour is the product of the airborne concentration (expressed as a fraction of DAC) and the time in hours, used to track cumulative internal dose potential.

  6. In a contamination control zone, what is the function of a 'step-off pad'?

    Answer: Collect foot contamination as personnel exit the contaminated zone before stepping into clean areas

    Step-off pads are placed at zone exits to capture and detect contamination on shoe covers before personnel move into clean areas.

  7. Which administrative control document formally authorizes work in a radiologically contaminated area and specifies required PPE and air sampling?

    Answer: Radiological work permit (RWP) or radiation work permit

    An RWP (Radiation Work Permit) is the formal authorization document that specifies radiological conditions, required PPE, monitoring requirements, and dose limits for a specific task.