I.Q.I in Aircraft Radiography
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Questions and Answers

Which factor is responsible for the blurring at the edges of a radiographic image?

  • Radiation penetrating power
  • Source of primary radiation
  • Movement (correct)
  • Film grain size
  • What does MPI stand for in the context of non-destructive examinations?

  • Massive Particle Infiltration
  • Microwave Point Inspection
  • Magnetic Particle Inspection (correct)
  • Macroscopic Particle Inversion
  • What does f.f.d. stand for in relation to gamma source?

  • Ferrous Flux Detection
  • Film Fault Diagnosis
  • Final Film Development
  • Focal Film Distance (correct)
  • What is the smallest distance between recognizable images on a film or screen called?

    <p>Image Resolution (A)</p> Signup and view all the answers

    What contributes to image blurring in radiographic images?

    <p>Penumbra or movement (B)</p> Signup and view all the answers

    What type of radiation results from the loss of energy or charged particles?

    <p>Electromagnetic Radiation (A)</p> Signup and view all the answers

    What is an example of a standard I.Q.I. used for radiographic inspection of aircraft structures?

    <p>Step-wedge I.Q.I. (A)</p> Signup and view all the answers

    Which type of I.Q.I. is sensitive to both sharpness and contrast, especially in smaller sizes?

    <p>Wire I.Q.I. (C)</p> Signup and view all the answers

    What is the main purpose of using an I.Q.I. for radiographic inspection?

    <p>To check for image sharpness and contrast (C)</p> Signup and view all the answers

    Which factor influences the sharpness of a radiographic image, especially under the control of the radiographer?

    <p>Film characteristics (C)</p> Signup and view all the answers

    In what scenarios would variations of standard I.Q.I. be used?

    <p>When searching for fatigue cracks (B)</p> Signup and view all the answers

    What does the wire I.Q.I. contain that helps assess image sharpness and contrast?

    <p>Thin metal wires (A)</p> Signup and view all the answers

    What may assist in identifying an area under examination?

    <p>Isometric drawing (C)</p> Signup and view all the answers

    Why might it be necessary to expose two or three films simultaneously without wrapping in a common cassette?

    <p>To improve the quality of radiographs for different thicknesses (B)</p> Signup and view all the answers

    When are gamma sources occasionally used in aircraft radiology?

    <p>When X-ray equipment is not available (B)</p> Signup and view all the answers

    How can a lead screen be helpful in radiography?

    <p>Achieving satisfactory radiographs of different thicknesses (C)</p> Signup and view all the answers

    What is the primary reason for using X-ray sets over gamma sources in aircraft radiology?

    <p>Because of unsharpness and lack of contrast with gamma sources (A)</p> Signup and view all the answers

    Why might simultaneous exposure of two or three films be employed without intervening wrapping in a common cassette?

    <p>To clearly show different thicknesses on radiographs (A)</p> Signup and view all the answers

    Study Notes

    IQI in Radiographic Inspection

    • IQI (Image Quality Indicator) is essential for thick specimens, but aircraft structures can serve as a natural IQI for most radiographic needs.
    • There are different types of IQI, including step-wedge IQI and wire IQI.

    Step-Wedge IQI

    • Consists of a number of steps ranging in thickness from 0.005 in to 0.1 in or greater as required.
    • Each step contains holes of varying sizes, used for identification and image sharpness.

    Wire IQI

    • Consists of short lengths of wire in graduated diameters, embedded in thin rubber or plastic sheet.
    • Sensitive to sharpness and contrast, particularly in smaller sizes.

    Specialized IQI

    • Variations of standard IQI can be used for special purposes, such as searching for fatigue cracks.

    Geometric Considerations

    • Sharpness of radiographic image is influenced by film characteristics and geometric effects, which are under the control of the radiographer.

    Radiographic Techniques

    • Simultaneous exposure of two or three films can be used to capture a range of thicknesses.
    • Lead screen separating two films can be used to achieve satisfactory radiographs of different material thicknesses.

    Gamma Rays in Aircraft Radiology

    • Gamma sources are used when X-ray equipment cannot access the inspection area.
    • Gamma sources have limitations, including unsharpness, lack of contrast, and decreased radiated energy.

    Radiology Terms

    • Atom: an atom of a particular element with the same chemical properties and atomic number but a different mass number.
    • Blurring: edge distortion of a radiographic image due to the radiation source being of finite dimensions.
    • Penetrating power: the ability of a beam of radiation to pass through a material.
    • Radiographic image: the photographic image produced by a beam of radiation after passing through a material.
    • Resolution: the smallest distance between recognisable images on a film or screen.
    • Focus-to-film distance (FFD): the distance from the source of primary radiation to a film set up for exposure.
    • Tube current: the current passing between the cathode and anode during X-ray tube operation.
    • X-ray shield: a type of shield that, in addition to the X-ray tube, may contain part of the high voltage generator.
    • Image blurring causes: penumbra, movement, grain size, or light, electron or X-ray scatter.
    • Electromagnetic radiation: radiation resulting from the loss of energy or charged particles (e.g., electrons).

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    Description

    Learn about the use of Image Quality Indicators (I.Q.I) in aircraft radiography, including step-wedge I.Q.I. Explore how different components of aircraft structures serve as I.Q.I for radiographic needs.

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