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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. What is the primary purpose of a glove box in radiological work?

    Answer: Provide a ventilated enclosure to handle radioactive materials without direct contact

    A glove box provides an enclosed, controlled environment allowing workers to manipulate radioactive materials through attached gloves without direct contact or exposure.

  2. Which instrument is most appropriate for detecting low-level tritium (H-3) air contamination?

    Answer: Liquid scintillation counter after air sample collection

    Tritium's very low-energy beta (18.6 keV max) cannot be detected directly in air; air samples are collected and analyzed by liquid scintillation counting.

  3. A smear survey shows 450 dpm/100 cm² of beta activity on an uncontrolled surface. What action is required per NRC guidelines?

    Answer: Post a Caution - Radioactive Material sign and restrict access

    NRC surface contamination limits for unrestricted areas are 1,000 dpm/100 cm² (beta/gamma); 450 dpm/100 cm² exceeds this, requiring posting and restriction.

  4. What does 'fixed' contamination mean in radiation protection?

    Answer: Radioactive material that cannot be removed from a surface by normal contact

    Fixed contamination is radioactive material bound to a surface that is not readily removable by wiping, contact, or normal operations.

  5. An airborne radioactivity area is defined as a location where airborne activity exceeds what DAC fraction?

    Answer: 0.1 DAC

    Under 10 CFR 20.1003, an airborne radioactivity area exists where concentrations exceed 0.1 DAC or where a worker could receive an intake exceeding 12 DAC-hours in a week.

  6. Which ventilation design principle is most effective at preventing the spread of radioactive contamination from a hot cell to adjacent areas?

    Answer: Maintaining the hot cell at negative pressure relative to the corridor

    Negative pressure in the contaminated area ensures air flows inward from clean zones, preventing migration of contamination to adjacent areas.

  7. A worker's nasal smear after removing respiratory protection shows detectable activity. What does this indicate?

    Answer: Potential respiratory tract deposition and possible internal contamination intake

    Positive nasal smears indicate that radioactive material has been inhaled and deposited in the nasal passage, suggesting an internal contamination intake occurred.