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Dosimetry and Exposure 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 Dosimetry and Exposure Control flashcards as text

  1. A radiation worker receives 150 mrem from external exposure and 50 mrem from internal deposition in a calendar quarter. What is the total effective dose equivalent for that quarter?

    Answer: 200 mrem

    Total effective dose equivalent combines both external and internal contributions: 150 + 50 = 200 mrem.

  2. Which dosimeter type uses lithium fluoride (LiF) crystals to measure accumulated radiation dose?

    Answer: Thermoluminescent dosimeter (TLD)

    TLDs use lithium fluoride crystals that store energy from radiation and release it as light when heated, proportional to dose received.

  3. Under NRC regulations, the annual occupational dose limit for the lens of the eye is:

    Answer: 15 rem

    10 CFR 20.1201 sets the annual occupational dose limit for the lens of the eye at 15 rem (150 mSv).

  4. What principle requires radiation protection programs to keep doses as low as reasonably achievable, considering economic and social factors?

    Answer: ALARA

    ALARA (As Low As Reasonably Achievable) is the radiation protection principle requiring dose minimization beyond just meeting regulatory limits.

  5. A direct-reading pocket dosimeter reads 0 mR at the start of a shift and 340 mR at the end. If the worker's legal dose limit is 1250 mR/quarter, what percentage of the quarterly limit was used?

    Answer: 27.2%

    340 mR ÷ 1250 mR × 100 = 27.2% of the quarterly limit was used.

  6. Which of the following best describes the committed effective dose equivalent (CEDE)?

    Answer: Dose from internal radionuclides integrated over 50 years following intake

    CEDE is the effective dose equivalent resulting from radionuclides deposited in the body, integrated over the 50-year period following intake.

  7. When bioassay results indicate a worker may have exceeded 10% of the Annual Limit on Intake (ALI), what action is required under 10 CFR 20?

    Answer: Investigate and assess the intake

    10 CFR 20.2104 requires licensees to assess intakes and resulting committed effective dose equivalent when intake is suspected to exceed 10% of the ALI.