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Radiographic Testing Safety Flashcards

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

Read the first 7 Radiographic Testing Safety flashcards as text

  1. What is the primary biological target of ionizing radiation that leads to long-term cancer risk?

    Answer: DNA in the cell nucleus

    Ionizing radiation's primary long-term risk comes from DNA damage in the cell nucleus, which can cause mutations leading to cancer.

  2. A 'direct reading dosimeter' (DRD) is required during field radiography in addition to a passive dosimeter because it:

    Answer: Gives the radiographer real-time dose rate feedback

    DRDs provide immediate, real-time dose rate information so radiographers can take protective action during a shoot.

  3. The 'controlled area' boundary during a radiographic exposure is typically established where the dose rate does not exceed:

    Answer: 2 mSv/hr (200 mrem/hr)

    In practice, the controlled (restricted) area boundary is placed where dose rates reach or exceed 2 mSv/hr (200 mrem/hr), limiting access to radiation workers.

  4. A radiation survey meter reads 'off-scale high' when pointed at the source container. This most likely indicates:

    Answer: The source has failed to retract into its shielded position

    An off-scale high reading near the source container strongly suggests the source is exposed or partially retracted, requiring immediate evacuation.

  5. Scatter radiation during industrial radiography primarily originates from:

    Answer: Interaction of the primary beam with the work piece and surroundings

    Scatter radiation is produced when the primary beam interacts with the test object, nearby structures, and the ground, radiating in all directions.

  6. Which of the following correctly states the concept of 'stochastic' radiation effects?

    Answer: Effects whose probability increases with dose but severity does not

    Stochastic effects like cancer have a probability proportional to dose but the severity (e.g., tumor type) is independent of how much dose caused it.

  7. A 'lost or stolen' radioactive source must be reported to the NRC within:

    Answer: 4 hours of discovery

    A lost or stolen licensed radioactive material must be reported immediately (within 4 hours) to the NRC Operations Center and local authorities.