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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:
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