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TEST: PET Radiation Safety
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1. Why is radiation used for PET so difficult to shield ?: Radiation used for PET has a lower energy and less penetrating ability compared to other isotopes used in nuclear medicine. Radiation
used for PET has a lower energy and greater penetrating ability compared to
other isotopes used in nuclear medicine. Radiation used for PET has a higher energy and less penetrating ability compared to other isotopes used in nuclear medicine. Radiation
used for PET has a higher energy and greater penetrating ability compared to
other isotopes used in nuclear medicine. |
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2. Which statement is correct ?: PET uses gamma radiation, produced when a nucleus goes through isomeric transition, for Nuclear Medicine imaging. PET uses annihilation radiation, produced when a positron collides with a negatron (electron), for Nuclear Medicine imaging. PET uses Bremsstrahlung radiation, produced when a beta particle suddenly changes direction, for Nuclear Medicine imaging. PET uses neutron radiation, produced when a
beryllium nucleus absorbs an alpha particle, for Nuclear Medicine imaging. |
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3. A good material to use for shielding radiation used for PET is... : Plastic Gypsum Drywall Tungsten Glass |
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4. A method to reduce the radiation dose to a technologist injecting a PET dose would be...: Wear a diagnostic lead apron Wear gloves Use an Automatic Dispensing System Drink
24 ounces of water prior to injection |
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5. The expected dose rate 2 inches from an unshielded syringe containing 15 mCi of F-18 is... ?:
0.33 rem/hour 3.3 rem/hour 33 rem/hour
333 rem/hour |
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6. The maximum annual occupational radiation dose a technologist may receive is...: 100 mrem whole body and 1,000 mrem extremity 1,000 mrem whole body and 10,000 mrem extremity 500 mrem whole body and 5,000 mrem extremity 5,000
mrem whole body and 50,000 mrem extremity |
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7. How much lead shielding is needed in the walls around a PET imaging room?: Shielding is never needed in the walls around a PET imaging room. Enough shielding is needed to insure the applicable dose limits for radiation workers and members of the public are not exceeded.
Two inches of lead is the minimum
shielding needed in the walls around a PET imaging room. Two inches of gypsum drywall is the minimum shielding needed in the walls around a PET imaging room. |
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8. What factor(s) affect radiation protection shielding issues in a PET imaging facility...?: Number of patients imaged Activity administered per patient Location of PET facility relative to controlled and uncontrolled areas All
of the Above |
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9. What area(s) of a PET facility do we need to be concerned about elevated radiation levels??: Adjacent offices Adjacent hallways Rooms with radiation sensitive equipment
All of the Above
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10. Which of the following statements is INCORRECT ?: PET uses high levels of low energy photons CT uses higher levels of low energy photons. If a room is properly shielded for PET, no additional shielding is needed for CT. If a room is properly shielded for CT, additional shielding will be needed for PET.
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