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6. The SI base of absorbed radiation dose is the:

  • Sievert
  • Megagray
  • Gray
  • Milligray

7. In the photoelectric absorption process:

  • The vacancy from the photoelectron is filled by an electron from an orbital (shell) further out in the atom
  • No ionisation of the atom takes place
  • The vacancy from the photoelectron is filled from an inner shell electron
  • All of the energy of the photon is passed to the free electron

8. Scattered radiation can be describes as:

  • Noise which does not convey useful information for the patient
  • X-rays which improve iamge quality
  • X-rays produced by the x-ray tube
  • radiation absorbed by the patient

9. if the output of an x-ray tube is measured at 20 mGy at 100cm, what will the approximate output at 3m?

  • 2.2 mGy
  • 0.22 mGy
  • 8 mGy
  • 22 mGy

10. which of the following statements best describe the function of a grid?

  • The grid only removes the primary beam radiation
  • The grid removes scattered radiation more efficiently than the primary beam
  • The grid only removes scattered radiation
  • The grid removes both scattered and the primary beam as efficiently as each other.

11. The inner envelope of an x-ray tube is usually made from:

  • Ceramics
  • Lead
  • Copper
  • Aluminium

12. How would you define radioactivity?

  • not influenced by external factors such as heat or pressure and does NOT involve electrons
  • not influenced by external factors such as heat or pressure and the involve ejection of electrons
  • Directly influenced by heat and temperature
  • The breakdown in nuclear coherence causing the ejection of an electron

13. As the photon energy of an x-ray beam increases:

  • The incidence of compton scattering increases
  • The incidence of Compton scattering increases and photoelectric absorption decreases
  • The incidence of Compton scattering and photoelctric absorption both decrease
  • The incidence of photoelectric absoprtion increases

14. The following material is added to the anode disc of a rotating x-ray tube to prevent the crazing effect

  • Rhenium
  • Carbon
  • Copper
  • Molybdenum

15. The mass attenuation coefficient is:

  • Equal to the linear attenuation process divided by the density
  • Equal to the linear attenuation process multiplied by the density
  • Independent of atomic number
  • Different for ice and water

16. The filtration of an x-ray beam has the effect of

  • Improving the quality of the transmitted x-ray beam
  • Increasing the quantity of the transmitted x-ray beam
  • Reducing the quantity and decreasing quality of the transmitted x-ray beam
  • Improving the quality and increasing quantity of the transmitted X-ray beam.

17. The voltage of an X-ray beam is conventionally measured in:

  • kVp
  • Joules per second
  • Joules
  • mAs

18. Radioactive emissions have different abillity to penetrate materials. Alpha particles are?

  • Relatively small and light but able to penerate the skin
  • Relatively big and heavy in atomic terms and a highly ionising form of radiation but not able to penetrate skin
  • Relatively big and heavy in atomic terms and a highly ionising form of radiation able to penetrate skin
  • Relatively small and light but unable to penerate the skin

19. Ten to the power of 2 (10 2) is equivalent to:

  • 100
  • 10 000
  • 1000
  • 10

20. Waves have three main components; amplitude, frequency and speed. The amplitude is:

  • The number of waves per second
  • Is the height of the wave
  • Its velocity
  • How quick it switches between its lowest and highest points