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    • Section 5 Radiation Carcinogenesis

    • Section 5 Radiation Carcinogenesis Questions

      For each type of exposure (1–5), match its type of radiation-induced cancer (A–E).
      1. Patients who are treated with radiation for ankylosing spondylitis.
      2. Patients who undergo fluoroscopy repeatedly during management of tuberculosis.
      3. Uranium workers.
      4. Dial painters who work with radium.
      5. Marshall Island inhabitants.

      A. Leukemia
      B. Breast cancer
      C. Thyroid cancer
      D. Lung cancer
      E. Bone cancer

      2. For each organ (1–4), match the correct description of cancer incidence in the U.S. population (A–D).
      1. Prostate
      2. Thyroid
      3. Breast
      4. Kidney

      A. Low natural–low radiogenic
      B. Low natural–high radiogenic
      C. High natural–high radiogenic
      D. High natural–low radiogenic

      3. Risk estimates for radiation-induced cancer in humans are based on studies involving __________. (Select all that apply.)
      A. Patients treated with I-131 for hyperthyroidism.
      B. Survivors of Hiroshima and Nagasaki.
      C. Women developing breast cancer after multiple fluoroscopic examinations for tuberculosis.
      D. Populations living near nuclear power plants.

      4. Which of the following statements correctly describe radiation oncogenesis? (Select all that apply.)
      A. Generally, the mean latent period for radiation-induced leukemia is about 20 years.
      B. Children are less sensitive than adults to the induction of leukemia.
      C. Benign neoplasms can be induced after irradiation.
      D. Solid tumors induced by radiation may appear 25 years or more after exposure.
      E. A whole-body dose of 0.1 Gy would be expected to increase the incidence of cancer from approximately 20% (the natural incidence) to approximately 30%.

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