X-rays and Radiation Quiz
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Questions and Answers

X-rays are described as:

  • A form of chemical energy
  • A type of visible radiation
  • A form of energy that transfers particles or energy from one place to another (correct)
  • A form of energy only detectable by the human body

    • X-rays interact with which of the following ?

  • Electrical currents
  • Photogenic emulsion (correct)
  • Sound waves
  • Infrared sensors

    • Which property of X-rays ensures they are unaffected by magnetic or electrical fields?

  • They lack electrical charge (correct)
  • They travel at the speed of light
  • They can’t be felt
  • They travel in a straight line

    • What is the definition of ionizing radiation?

    <p>Radiation with enough energy to remove electrons from atoms, ionizing them (C)</p> Signup and view all the answers

    Which statement best defines non-ionizing radiation?

    <p>Low-energy radiation that cannot remove electrons from atoms (B)</p> Signup and view all the answers

    Which of the following is an example of ionizing radiation?

    <p>Gamma rays (C)</p> Signup and view all the answers

    Which of the following is NOT a characteristic of non-ionizing radiation?

    <p>Can cause genetic and somatic abnormalities (D)</p> Signup and view all the answers

    What distinguishes the energy transfer of non-ionizing radiation?

    <p>Energy is transferred in waves without enough energy to cause ion creation (B)</p> Signup and view all the answers

    Non-ionizing radiation is characterized by ____ wavelengths and ____ frequency

    <p>Long ; low</p> Signup and view all the answers

    Which cells are the most sensitive to radiation exposure?

    <p>Cells itch a high division rate, such as gonads and embryonic tissue (D)</p> Signup and view all the answers

    What can happen if sperm or eggs are damaged by radiation?

    <p>They can carry defects to the next generation (B)</p> Signup and view all the answers

    What are possible effects of radiation exposure during the first trimester of pregnancy?

    <p>Embryonic death, congenital abnormalities or growth defects</p> Signup and view all the answers

    What does the inverse square law state regarding x-ray intensity?

    <p>X-ray intensity decreases as the distance from the focal spot increases (B)</p> Signup and view all the answers

    What happens to the blackness of the X-ray image as the Focal Film Distance (FFD) increases?

    <p>Blackness decreases (B)</p> Signup and view all the answers

    Why is radiation safety important?

    <p>It’s to comply with the law, protect health, and avoid legal liabilities</p> Signup and view all the answers

    What does the ALARA principle stand for in radiation safety?

    <p>As Low As Reasonably Achievable</p> Signup and view all the answers

    What is the importance of the ALARA principle?

    <p>To limit exposure by using time, distance and shielding</p> Signup and view all the answers

    What are the three time-based methods to limit radiation exposure?

    <p>Minimize retakes, sedation of the patient and have knowledgeable staff and staff rotation</p> Signup and view all the answers

    What are the two recommended distance-based methods to limit radiation exposure?

    <p>Cassete holders and patient positioning with objects like sandbags</p> Signup and view all the answers

    What are the recommended methods for shielding?

    <p>Screens and doors, lead or lead equivalent aprons, gloves, thyroid shields and glasses, collimation</p> Signup and view all the answers

    What is the purpose of shielding in relation to the ALARA principle?

    <p>Protection from scattered radiation</p> Signup and view all the answers

    How does scatter radiation affect x-ray quality?

    <p>It decreases image quality</p> Signup and view all the answers

    What is the purpose of personal monitoring in radiation safety?

    <p>To monitor employee radiation exposure using badges or rings (A)</p> Signup and view all the answers

    Where should radiation monitoring badges be worn?

    <p>Outside the lead apron at collar level (B)</p> Signup and view all the answers

    How often should radiation monitoring badges be analyzed?

    <p>At least quarterly so that increased exposures can be caught early</p> Signup and view all the answers

    How are x-rays produced in an X-ray machine?

    <p>By striking the anode with electrons attracted from the cathode (B)</p> Signup and view all the answers

    Describe how x-rays are produced.

    <p>An electric current is applied to a wire filament within the negatively charged cathode, causing the release of electrons. The electrons are attracted to the positively charged anode, so they strike the anode with great velocity. The striking produced two forms of energy: heat and X-ray</p> Signup and view all the answers

    What is the purpose of the rotating anode in an X-ray machine?

    <p>To dissipate the heat generated during X-ray production (C)</p> Signup and view all the answers

    What is the function of the grid in an X-ray machine?

    <p>To absorb scatter radiation and allow only the primary beam to pass (B)</p> Signup and view all the answers

    What is the correct order through which the X-ray beam passes during imaging?

    <p>Patient -&gt; table -&gt; grid -&gt; image receptor (A)</p> Signup and view all the answers

    Where is the grid located in an X-ray machine?

    <p>Between the patient and image receptor (B), Beneath the table but above the image receptor (D)</p> Signup and view all the answers

    What does mAs control in X-ray imaging?

    <p>The number of photons being produced (A)</p> Signup and view all the answers

    What does kVp control in X-ray imaging?

    <p>The energy and penetrating power of photons (C)</p> Signup and view all the answers

    What does “exposure” refer to in X-ray imaging?

    <p>The “blackness” of an image</p> Signup and view all the answers

    When photons reach the image receptor, the film changes from:

    <p>White to black (B)</p> Signup and view all the answers

    What happens if mAs is set too high?

    <p>The film becomes overexposed (B)</p> Signup and view all the answers

    How can you correct an overexposed radiograph caused by high mAs?

    <p>Decrease mAs by half (B)</p> Signup and view all the answers

    What happens if kVp is set too low?

    <p>The radiograph appears underexposed due to insufficient penetrating power (A)</p> Signup and view all the answers

    To correct underexposure caused by low kVp, you should:

    <p>Increase kVp by 15% (B)</p> Signup and view all the answers

    If the image is overexposed, it appears white.

    <p>False (B)</p> Signup and view all the answers

    When correcting under / over exposure, you only adjust the mAs or kVP, never both

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

    What is image contrast?

    <p>The difference in lightness and darkness of an image</p> Signup and view all the answers

    What type of contrast is achieved with high mAs and low kVp settings?

    <p>High contrast (A)</p> Signup and view all the answers

    Another term for high contrast is known as ______

    <p>Short scale contrast</p> Signup and view all the answers

    When using high contrast techniques, the resulting image will have:

    <p>Shades of black and white with few greys (C)</p> Signup and view all the answers

    Which area of the body is best imaged using high contrast techniques?

    <p>Abdomen (B)</p> Signup and view all the answers

    What type of contrast is associated with low mAs and high kVp?

    <p>Low contrast (D)</p> Signup and view all the answers

    Another term for low contrast is known as _____

    <p>Long scale contrast</p> Signup and view all the answers

    Low contrast imaging is characterized by:

    <p>Many shades of grey (B)</p> Signup and view all the answers

    Which body area has inherent contrast and is best imaged with low contrast techniques?

    <p>Thorax (B)</p> Signup and view all the answers

    What is the purpose of intensifying screens?

    <p>To convert x-rays into visible light</p> Signup and view all the answers

    List the benefits of intensifying screens

    <p>Less x-rays needed to expose radiographic film, less radiation exposure for the patient and medical personnel, less stress on the x-ray tube and less chance of motion artifact</p> Signup and view all the answers

    What is the disadvantage of intensifying screens?

    <p>intensifying screens decrease the image detail</p> Signup and view all the answers

    Flashcards

    X-rays

    A form of radiation that carries energy and travels in straight lines at the speed of light.

    Ionizing radiation

    Radiation that can knock electrons off an atom, creating ions.

    Gamma rays

    A type of ionizing radiation with the shortest wavelengths and highest energy.

    Non-ionizing radiation

    Radiation that transfers energy in waves without creating ions.

    Signup and view all the flashcards

    Microwaves and radio waves

    Examples of non-ionizing radiation with long wavelengths and low energy.

    Signup and view all the flashcards

    Study Notes

    X-rays

    • X-rays are a form of radiation that transfers energy or energetic particles.
    • X-rays travel at the speed of light.
    • X-rays have no electrical charge and aren't affected by magnetic or electric fields.
    • X-rays travel in straight lines.
    • X-rays can penetrate matter to some degree.
    • X-rays can cause fluorescence.
    • X-rays can interact with photogenic emulsion.
    • X-rays cause ionization.
    • X-rays cannot be felt and are invisible.
    • X-rays are part of the electromagnetic spectrum.

    Ionizing Radiation

    • Ionizing radiation releases energy that can remove electrons from an atom, ionizing the atom.
    • Ionizing radiation has short wavelengths and high frequencies.
    • Gamma rays are an example of ionizing radiation.

    Non-ionizing Radiation

    • Non-ionizing radiation involves energy transfer via waves.
    • Microwaves and radio waves do not have enough energy to create ions.

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    Description

    Test your knowledge on X-rays and different types of radiation, including ionizing and non-ionizing radiation. This quiz covers key characteristics, effects, and properties of these forms of energy. Perfect for students studying physics or related fields.

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