Radiology Physics Review Questions
and Answers Graded A+
What is the speed of electromagnetic radiation in a vacuum?
✔✔ 3 x 10⁸ meters per second.
What type of radiation has the shortest wavelength in the electromagnetic spectrum?
✔✔ Gamma rays.
What is the main function of the anode in an X-ray tube?
✔✔ To serve as the target for electrons and produce X-rays.
What is the primary purpose of a vacuum inside the X-ray tube?
✔✔ To allow electrons to move freely without colliding with air molecules.
What material is commonly used for the X-ray tube target?
✔✔ Tungsten.
1
,What is the term for the reduction in X-ray beam intensity as it passes through matter?
✔✔ Attenuation.
What is the unit of electrical current in the X-ray tube?
✔✔ Milliampere (mA).
What happens to the wavelength of an X-ray photon as its energy increases?
✔✔ The wavelength decreases.
What is the function of the cathode in an X-ray tube?
✔✔ To emit electrons through thermionic emission.
What is the purpose of a collimator in radiology?
✔✔ To restrict the size and shape of the X-ray beam.
What interaction is responsible for producing characteristic X-rays?
✔✔ Electron transition between atomic energy levels.
2
, What is the role of filtration in an X-ray beam?
✔✔ To remove low-energy photons and reduce patient dose.
What does kVp stand for in radiology?
✔✔ Kilovolt peak.
What effect does increasing the kVp have on the X-ray beam?
✔✔ It increases the beam's penetration and energy.
What is the primary interaction of X-rays in soft tissue?
✔✔ Compton scattering.
What type of radiation interaction results in ionization?
✔✔ Photoelectric effect.
What is the unit used to measure radiation exposure in air?
✔✔ Roentgen (R) or Coulomb per kilogram (C/kg).
3
and Answers Graded A+
What is the speed of electromagnetic radiation in a vacuum?
✔✔ 3 x 10⁸ meters per second.
What type of radiation has the shortest wavelength in the electromagnetic spectrum?
✔✔ Gamma rays.
What is the main function of the anode in an X-ray tube?
✔✔ To serve as the target for electrons and produce X-rays.
What is the primary purpose of a vacuum inside the X-ray tube?
✔✔ To allow electrons to move freely without colliding with air molecules.
What material is commonly used for the X-ray tube target?
✔✔ Tungsten.
1
,What is the term for the reduction in X-ray beam intensity as it passes through matter?
✔✔ Attenuation.
What is the unit of electrical current in the X-ray tube?
✔✔ Milliampere (mA).
What happens to the wavelength of an X-ray photon as its energy increases?
✔✔ The wavelength decreases.
What is the function of the cathode in an X-ray tube?
✔✔ To emit electrons through thermionic emission.
What is the purpose of a collimator in radiology?
✔✔ To restrict the size and shape of the X-ray beam.
What interaction is responsible for producing characteristic X-rays?
✔✔ Electron transition between atomic energy levels.
2
, What is the role of filtration in an X-ray beam?
✔✔ To remove low-energy photons and reduce patient dose.
What does kVp stand for in radiology?
✔✔ Kilovolt peak.
What effect does increasing the kVp have on the X-ray beam?
✔✔ It increases the beam's penetration and energy.
What is the primary interaction of X-rays in soft tissue?
✔✔ Compton scattering.
What type of radiation interaction results in ionization?
✔✔ Photoelectric effect.
What is the unit used to measure radiation exposure in air?
✔✔ Roentgen (R) or Coulomb per kilogram (C/kg).
3
