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Radioactive Material 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 Radioactive Material Control flashcards as text

  1. A respirator with an assigned protection factor (APF) of 10 means it reduces the worker's airborne radioactive material intake by:

    Answer: To one-tenth of the ambient airborne concentration

    An APF of 10 means the respirator allows no more than 1/10 of the ambient concentration to reach the wearer's breathing zone.

  2. Which regulatory standard governs the packaging and transport of radioactive material by all modes of transport in the United States?

    Answer: 49 CFR Parts 171–180 — DOT Hazardous Materials Regulations

    The Department of Transportation's hazardous materials regulations in 49 CFR govern all modes of transport for radioactive material within the US.

  3. Radioactive material with a half-life of 30 days is stored for 90 days. What fraction of the original activity remains?

    Answer: 1/8

    After 3 half-lives (90/30 = 3), the remaining fraction is (1/2)³ = 1/8 of the original activity.

  4. Which of the following is the MOST reliable method to confirm that an area is free of residual radioactive contamination after decontamination?

    Answer: Systematic smear surveys analyzed by liquid scintillation or proportional counting

    Smear surveys collected in a systematic grid pattern and counted in a laboratory provide quantitative removable contamination data well below field instrument detection limits.

  5. A facility generates aqueous radioactive waste with 0.001 µCi/mL of H-3. Before releasing it to the sanitary sewer under 10 CFR 20.2003, what must be verified?

    Answer: The concentration does not exceed the annual average limit and total annual discharge limits are met

    10 CFR 20.2003 requires that sanitary sewer releases not exceed the concentration limit (averaged over a month) and that total annual release quantities stay within prescribed limits.

  6. During a personnel contamination event, a worker has detectable skin contamination that cannot be removed after three gentle washing attempts. The next appropriate action is to:

    Answer: Notify the RSO and seek medical evaluation for possible skin dose assessment

    Persistent skin contamination requires RSO involvement and medical evaluation to assess skin dose and determine whether further decontamination is safe or medically warranted.

  7. The ALARA principle as applied to radioactive material control requires that exposures be reduced:

    Answer: To levels as low as reasonably achievable considering economic and social factors

    ALARA mandates optimization: dose reductions are pursued as long as the benefit of further reduction is proportionate to the effort and cost required.