Radiation Physics Overview
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Questions and Answers

What is the purpose of the filament in an X-ray tube?

  • To direct the electrons from the cathode to the anode
  • To focus the X-ray beam
  • To produce electrons through thermionic emission (correct)
  • To dissipate heat from the target

    • What is the advantage of using Tungsten (W) as the filament material?

  • High atomic number and melting point (correct)
  • Low atomic number
  • Low melting point
  • Easily absorbs and dissipates heat

    • What effect does the cup around the filament have in an X-ray tube?

  • Reduces the number of electrons boiled off
  • Converges the electrons towards the anode (correct)
  • Helps in thermionic emission
  • Expands the electron beam

    • Why is a rotating anode preferred over a stationary anode in X-ray machines?

    <p>Shortens cooling time for the anode</p> Signup and view all the answers

    What impact does a focusing cup have on electron beams in an X-ray tube?

    <p>Converges the electrons towards the anode</p> Signup and view all the answers

    How does the line focus principle help in X-ray generation?

    <p>Directs a larger surface area of electrons to the target</p> Signup and view all the answers

    What type of radiation changes the number of electrons of an atom?

    <p>Ionizing radiation</p> Signup and view all the answers

    Which type of radiation consists of small, fast-moving particles that have both energy and mass?

    <p>Alpha particles</p> Signup and view all the answers

    What are the units of measurement for current and voltage in x-ray production, respectively?

    <p>Current: milliAmperes, Voltage: kiloVoltage</p> Signup and view all the answers

    Which type of radiation is characterized by electromagnetic waves that do not carry enough energy?

    <p>Radio waves</p> Signup and view all the answers

    What type of radiation is primarily produced by the disintegration of an unstable atom?

    <p>Alpha and Beta particles</p> Signup and view all the answers

    In x-ray terminology, what is the unit for measuring voltage?

    <p>kiloVoltage</p> Signup and view all the answers

    What is the primary function of the filament transformer in an X-ray tube?

    <p>To generate the low voltage current for heating the filament</p> Signup and view all the answers

    Which mechanism is primarily responsible for heat dissipation in an X-ray tube?

    <p>All of the above mechanisms contribute equally</p> Signup and view all the answers

    What is the purpose of increasing the tube voltage (kVp) in X-ray imaging?

    <p>To increase the energy of the electrons accelerated towards the anode</p> Signup and view all the answers

    What type of X-ray interaction with the target atom is responsible for the production of Bremsstrahlung radiation?

    <p>All of the above interactions contribute to Bremsstrahlung radiation</p> Signup and view all the answers

    Which type of X-ray imaging typically requires higher tube voltages (kVp) compared to intraoral or cephalometric imaging?

    <p>Cone Beam CT imaging</p> Signup and view all the answers

    What is the primary purpose of filtration in an X-ray machine?

    <p>To remove low energy photons that contribute to patient exposure</p> Signup and view all the answers

    What is the relationship between tube current (mA) and X-ray production?

    <p>Higher mA increases the number of X-rays produced</p> Signup and view all the answers

    How does increasing the tube voltage (kVp) affect X-ray production?

    <p>It increases both the energy and number of photons generated</p> Signup and view all the answers

    What is the primary advantage of collimation in X-ray imaging?

    <p>It protects the patient from non-diagnostic radiation exposure</p> Signup and view all the answers

    According to the inverse square law, how does doubling the distance from an X-ray source affect the intensity of the beam?

    <p>The intensity is reduced to one-fourth of its original value</p> Signup and view all the answers

    Which type of interaction between X-rays and matter results in a change in the direction of the photon without any energy loss?

    <p>Coherent (Rayleigh) scattering</p> Signup and view all the answers

    What is the primary interaction responsible for decreasing image contrast in X-ray imaging?

    <p>Compton scattering</p> Signup and view all the answers

    What is the approximate percentage of X-ray interactions that involve coherent (Rayleigh) scattering?

    <p>8%</p> Signup and view all the answers

    How does increasing the exposure time affect X-ray production?

    <p>It increases the number of X-rays produced</p> Signup and view all the answers

    Which factor primarily determines the probability of Compton scattering occurring?

    <p>The electron density of the material</p> Signup and view all the answers

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