All RAD Physics Questions and Answers
Graded A+
What is the charge of an electron?
✔✔ Negative.
What is the function of the anode in an X-ray tube?
✔✔ To serve as the target for electrons and produce X-rays.
What happens to the X-ray beam when kVp is increased?
✔✔ The energy and penetration of the X-rays increase.
What is the primary interaction responsible for scatter radiation?
✔✔ Compton scattering.
What is attenuation in radiology?
✔✔ The reduction in intensity of the X-ray beam as it passes through matter.
1
,What is the purpose of a collimator?
✔✔ To restrict the size and shape of the X-ray beam.
What material is commonly used as the target in an X-ray tube?
✔✔ Tungsten.
Why is tungsten used in X-ray tubes?
✔✔ Because of its high atomic number and high melting point.
What is thermionic emission?
✔✔ The release of electrons from a heated filament.
What is the purpose of filtration in an X-ray beam?
✔✔ To remove low-energy photons that do not contribute to the image.
What is the half-life of a radioactive isotope?
✔✔ The time it takes for half of the radioactive atoms to decay.
2
,What is the primary source of scatter radiation in radiography?
✔✔ The patient’s body.
What is the function of a grid in radiography?
✔✔ To reduce scatter radiation reaching the image receptor.
What does ALARA stand for?
✔✔ As Low As Reasonably Achievable.
What is the relationship between wavelength and energy of X-rays?
✔✔ They are inversely proportional.
What is bremsstrahlung radiation?
✔✔ Radiation produced when high-speed electrons are decelerated near the nucleus.
What is the purpose of a lead apron?
✔✔ To protect against scatter radiation.
3
, What does kVp control in an X-ray machine?
✔✔ The energy and quality of the X-ray beam.
What is the smallest unit of a digital image?
✔✔ Pixel.
What is the function of automatic exposure control (AEC)?
✔✔ To ensure consistent image exposure by controlling the duration of exposure.
What is the photoelectric effect in radiology?
✔✔ The absorption of an X-ray photon with ejection of an inner-shell electron.
What is the primary reason for using contrast agents?
✔✔ To enhance the visibility of specific structures or tissues.
What is beam hardening?
✔✔ The increase in average energy of an X-ray beam after passing through matter.
4
Graded A+
What is the charge of an electron?
✔✔ Negative.
What is the function of the anode in an X-ray tube?
✔✔ To serve as the target for electrons and produce X-rays.
What happens to the X-ray beam when kVp is increased?
✔✔ The energy and penetration of the X-rays increase.
What is the primary interaction responsible for scatter radiation?
✔✔ Compton scattering.
What is attenuation in radiology?
✔✔ The reduction in intensity of the X-ray beam as it passes through matter.
1
,What is the purpose of a collimator?
✔✔ To restrict the size and shape of the X-ray beam.
What material is commonly used as the target in an X-ray tube?
✔✔ Tungsten.
Why is tungsten used in X-ray tubes?
✔✔ Because of its high atomic number and high melting point.
What is thermionic emission?
✔✔ The release of electrons from a heated filament.
What is the purpose of filtration in an X-ray beam?
✔✔ To remove low-energy photons that do not contribute to the image.
What is the half-life of a radioactive isotope?
✔✔ The time it takes for half of the radioactive atoms to decay.
2
,What is the primary source of scatter radiation in radiography?
✔✔ The patient’s body.
What is the function of a grid in radiography?
✔✔ To reduce scatter radiation reaching the image receptor.
What does ALARA stand for?
✔✔ As Low As Reasonably Achievable.
What is the relationship between wavelength and energy of X-rays?
✔✔ They are inversely proportional.
What is bremsstrahlung radiation?
✔✔ Radiation produced when high-speed electrons are decelerated near the nucleus.
What is the purpose of a lead apron?
✔✔ To protect against scatter radiation.
3
, What does kVp control in an X-ray machine?
✔✔ The energy and quality of the X-ray beam.
What is the smallest unit of a digital image?
✔✔ Pixel.
What is the function of automatic exposure control (AEC)?
✔✔ To ensure consistent image exposure by controlling the duration of exposure.
What is the photoelectric effect in radiology?
✔✔ The absorption of an X-ray photon with ejection of an inner-shell electron.
What is the primary reason for using contrast agents?
✔✔ To enhance the visibility of specific structures or tissues.
What is beam hardening?
✔✔ The increase in average energy of an X-ray beam after passing through matter.
4
