Practice Test Geeks(CMD) Certified Medical Dosimetrist Practice Test
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Radiation Safety & Protection Flashcards

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

Read the first 7 Radiation Safety & Protection flashcards as text

  1. What is the annual occupational effective dose limit for radiation workers in the United States?

    Answer: 50 mSv

    The NRC sets the annual occupational effective dose limit at 50 mSv (5 rem) per year for radiation workers.

  2. Which radiation quantity accounts for both the absorbed dose and the biological effectiveness of different radiation types?

    Answer: Equivalent dose (Sievert)

    Equivalent dose in Sieverts equals absorbed dose multiplied by the radiation weighting factor, reflecting biological effectiveness.

  3. A dosimetrist is planning a high-dose-rate brachytherapy procedure. What is the minimum recommended shielding material thickness for a dedicated HDR vault with Ir-192?

    Answer: 24 inches of concrete or equivalent

    HDR Ir-192 vaults typically require approximately 24 inches (60 cm) of concrete or equivalent shielding to meet dose rate limits in adjacent areas.

  4. Which principle of radiation protection requires that doses be kept as low as reasonably achievable?

    Answer: ALARA

    ALARA (As Low As Reasonably Achievable) is the guiding principle requiring radiation doses to be minimized beyond regulatory limits when practical.

  5. When using a survey meter to check for contamination after a brachytherapy seed implant procedure, which meter type is most appropriate?

    Answer: Geiger-Müller detector

    A Geiger-Müller detector is the most appropriate survey instrument for contamination checks due to its high sensitivity for detecting small amounts of radioactivity.

  6. What is the lens of the eye annual dose equivalent limit for radiation workers per NRC regulations?

    Answer: 150 mSv

    The NRC annual dose equivalent limit for the lens of the eye is 150 mSv (15 rem) for occupational workers.

  7. A radiation worker's personal dosimeter reads significantly higher than expected after a month. What is the FIRST action to take?

    Answer: Investigate the cause before drawing conclusions

    The first step is always to investigate whether the reading reflects actual exposure, dosimeter malfunction, or inadvertent irradiation before taking further action.