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  • Section 11 Radiation Protection

  • Section 11 Radiation Protection Questions

    1. The dose-response relationship for solid tumors in the Japanese survivors used by the BEIR V and UNSCEAR committees has which of the following forms?
    A. Linear with no threshold
    B. Linear with threshold
    C. Quadratic with no threshold
    D. Exponential
    E. Quadratic with threshold
    2. A pregnant, occupationally exposed woman working in fluoroscopy shows a reading of 4 mSv over 90 days to a badge worn on her collar over a lead apron. Which of the following best characterizes her situation?
    A. The Nuclear Regulatory Commission (NRC) should be called.
    B. She should no longer work with fluoroscopy.
    C. The dose recorded does not exceed National Council on Radiation Protection and Measurements (NCRP) recommendations.
    D. A therapeutic abortion is recommended.

    3. Which of the four pie charts (A–D) best describes the distribution of effective doses to the average individual in the U.S. population as summarized by the NCRP?Section 11 Question 3 

    Reprinted with permission of the National Council on Radiation Protection and Measurements and include the following link, http://www.ncrppublications.org/Reports/160 

    4. The biggest contributor to the effective dose to the U.S. population from natural causes is __________.
    A. Cosmic radiation.
    B. Solar radiation.
    C. Radon.
    D. Potassium-40 in food.
    E. Gamma ray emitters in building materials.

    5. In the United States, the greatest source of exposure to ionizing radiation (collective effective dose) in the general population due to human activity is __________.
    A. Video display terminals.
    B. Fallout from nuclear weapons testing.
    C. Nuclear waste disposal sites.
    D. Medical and dental diagnostic radiation.
    E. Nuclear reactor accidents.

    6. Which of the following procedures is likely to result in the greatest radiation exposure of personnel?
    A. Chest radiograph obtained with a technologist in the room.
    B. One CT section obtained with a technologist in the room.
    C. Fluoroscopy of the abdomen for 3 minutes.
    D. Knee examination with MR imaging.

    7. A worker in a nuclear medicine laboratory declares that she is 3 months pregnant. What is the NCRP recommended limit for the remainder of the pregnancy?
    A. None
    B. 0.05 mSv/mo
    C. 0.5 mSv/mo
    D. 3 3 mSv total
    E. 3 30 mSv total

    8. For radiation protection purposes, which of the following statements is correct?
    A. the maximum permissible dose for hands reflects concern for cancer
    B. a whole-body low-dose-rate exposure has a cancer risk of 4%/Sv
    C. hands are nearly as radiosensitive as the eye
    D. low-dose-rate exposures are associated with a lower risk of cancer development than high-dose-rate exposures

    9. For each type of exposure (1–4), match the appropriate current NCRP-recommended maximum permissible dose (A–D).
    1. Annual occupational effective dose limit
    2. Annual public equivalent dose limit (frequent exposure)
    3. Monthly equivalent dose limit to a fetus after a pregnancy has been declared
    4. Annual occupational equivalent dose limit for the lens of the eye
    A. 0.5 mSv
    B. 1 1 mSv
    C. 5 50 mSv
    D. 15 15 0 mSv

    10. The NCRP maximum permissible dose for the hands of radiation workers is based on __________.
    A. estimates for cancer induction of the basal layer of the skin.
    B. effects anticipated after acute exposures.
    C. epidemiologic studies of nuclear power plant employees.
    D. concern for deterministic effects.

    11. Which of the following are NCRP recommendations concerning occupational exposure? (Select all that apply.)
    A. No occupational exposure is allowed before the age of 18 years.
    B. Medical radiation received by radiation workers is included in their maximum permissible dose.
    C. ALARA (as low as reasonably achievable) does not apply to occupational exposure.
    D. The purpose of the occupational maximum dose is to protect against both stochastic and deterministic effects.

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