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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 worker handles an open vial of I-131 solution without gloves and later tests positive for thyroid uptake. Which route of intake is MOST likely responsible?

    Answer: Inhalation of volatile iodine vapor

    I-131 readily volatilizes from solution, making inhalation the predominant intake route in open handling situations without respiratory protection.

  2. Which label is required on a package containing radioactive material with a transport index of 3.2?

    Answer: Yellow-III label

    A transport index between 1.0 and 10 requires a Yellow-III label; Yellow-II is for TI > 0 but ≤ 1.0; Yellow-III covers TI > 1.0 up to 10.

  3. What is the purpose of a 'step-off pad' at the exit of a contaminated area?

    Answer: To provide a clean surface where workers change footwear and check for foot contamination

    Step-off pads define the transition zone where workers remove potentially contaminated shoe covers and survey their feet before entering uncontrolled areas.

  4. A decommissioning project wants to release a building for unrestricted use. The applicable NRC criterion for surface contamination release is based on:

    Answer: Dose to a hypothetical maximally exposed individual not exceeding 25 mrem/year

    NRC's license termination rule (10 CFR 20 Subpart E) sets a 25 mrem/year total effective dose equivalent (TEDE) criterion for unrestricted release of facilities.

  5. Tritium (H-3) presents a unique internal dose hazard primarily because:

    Answer: As water (HTO) it distributes uniformly throughout total body water

    Tritiated water is absorbed rapidly and distributes throughout all body water compartments, irradiating all soft tissues with a biological half-life of about 10 days.

  6. Under 10 CFR 20, which of the following correctly identifies when a Radiation Work Permit (RWP) or equivalent authorization is typically required?

    Answer: When entering a High Radiation Area or performing non-routine work with radioactive material

    RWPs are administrative controls used to authorize entry into elevated radiation or contamination areas and to define protective measures for non-routine or higher-hazard tasks.

  7. What is the recommended frequency for calibrating portable radiation survey instruments used in routine health physics programs?

    Answer: At intervals not to exceed 12 months, with source checks before each use

    NRC regulations (10 CFR 20.1501) and ANSI standards require calibration at least annually, with operability source checks performed before each use.