Practice Test Geeks(CRI) Certified Radiographic Interpreter Practice Test
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Radiation Safety & Protection Flashcards

7 cards from real CRI 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. A radiographer is working with an Ir-192 source. What is the approximate half-life of Ir-192?

    Answer: 74 days

    Iridium-192 has a half-life of approximately 74 days, requiring periodic source replacement.

  2. What minimum survey meter reading at the surface of a radiography camera indicates the source is fully retracted?

    Answer: Background level only

    When the source is fully retracted, readings should return to background levels at the device surface.

  3. Which regulation governs the transportation of radioactive materials by road in the United States?

    Answer: 49 CFR Part 173

    49 CFR Part 173 (DOT regulations) governs the classification and packaging of hazardous materials including radioactive sources during transport.

  4. What does a transport index (TI) of 1.0 on a radioactive package indicate?

    Answer: The dose rate at 1 meter is 0.1 mSv/hr

    A TI of 1.0 means the maximum dose rate at 1 meter from the package surface is 0.1 mSv/hr (10 mrem/hr).

  5. In industrial radiography, what is the purpose of the source guide tube?

    Answer: To guide the source to the exposure position

    The source guide tube directs and positions the source at the desired exposure location away from the camera body.

  6. Which type of radiation interaction is responsible for most of the ionization caused by beta particles in tissue?

    Answer: Direct ionization

    Beta particles cause ionization primarily through direct Coulombic interactions with orbital electrons in tissue.

  7. A radiographer discovers a locked-jaw condition during a field operation. What is the FIRST action to take?

    Answer: Evacuate the area and establish a barrier

    The immediate priority is to evacuate all personnel and establish a safety barrier to prevent additional exposure.

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