With regards to diagnostic radiography, define the photoelectric effect and describe its relationship with atomic number (Z) of the attenuating medium and energy of incident photon

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With regards to diagnostic radiography, define the photoelectric effect and describe its
relationship with atomic number (Z) of the attenuating medium and energy of incident
photon

8. Ionisation chambers and Geiger-Muller (GM) counters are both types of gas-filled
detectors.
Answer both parts of this question:
a) Briefly explain how a gas-filled detector works. (3 marks)
b) Give one (1) use each for ionisation chambers and GM counters. (2 marks)
9. With regards to diagnostic radiography, define the photoelectric effect and describe its
relationship with atomic number (Z) of the attenuating medium and energy of incident
photon (E). (5 marks)
10. List three (3) mechanisms of pathogenesis of non-cardiogenic oedema and give an
example of a cause associated with each of the mechanisms. (5 marks)
11. List five (5) methods that are incorporated into X-ray tube head design that reduce the
risks of heat damage to the tube. (5 marks)

 

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