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Dosimetry and Personal Exposure Assessment Flashcards

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

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  1. A whole-body counter is used to measure:

    Answer: Internally deposited gamma-emitting radionuclides

    A whole-body counter uses large-volume gamma detectors positioned around the body to detect and quantify internally deposited gamma-emitting radionuclides in organs and tissues.

  2. An RSO receives a dosimeter report showing a worker accumulated 4,200 mrem DDE in one quarter. The RSO's first action should be to:

    Answer: Investigate the cause, verify the dose was correctly assigned, and evaluate whether any corrective actions are needed

    Upon receiving an elevated dosimeter report, the RSO should investigate its cause (actual exposure vs. dosimeter error), verify the dose assignment, and determine if administrative controls or corrective actions are needed.

  3. For uranium workers, urine bioassay results are typically expressed in units of:

    Answer: Bq/L or µg/L (mass concentration)

    Uranium urine bioassay is reported as activity per liter (Bq/L) or as mass concentration (µg/L), since natural uranium's chemical toxicity is also a concern alongside radiological dose.

  4. The Annual Limit on Intake (ALI) for a radionuclide is defined as the intake that would result in a committed effective dose of:

    Answer: 50 mSv (5 rem)

    The ALI is the amount of a radionuclide that, if inhaled or ingested, would deliver a committed effective dose equal to the annual occupational limit of 50 mSv (5 rem).

  5. A nasal swipe collected shortly after a potential inhalation event is used to:

    Answer: Provide a rapid qualitative screening indicator of potential internal contamination

    A nasal swipe quickly screens for the presence of radioactive material in the nasal passages, indicating potential inhalation, though it does not quantify the committed dose.

  6. Personnel dosimetry records must be maintained by NRC licensees for how long?

    Answer: For the duration of employment plus 3 years post-termination, or until age 75 (whichever is later)

    NRC regulations require that personnel dosimetry records be maintained until the worker reaches age 75, or for at least 3 years after the record is made, ensuring long-term access for chronic disease tracking.