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Radionuclide imaging and therapy (A-level only)

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Question 5

An ultrasound scan is often preferred over X-ray imaging for imaging soft tissues.

a.

Explain the biological risk associated with patient exposure to X-rays. Discuss three ways by which the design and use of X-ray equipment minimises this risk.

[4]
b.

A patient with suspected gallstones suspended in the gallbladder can be investigated using either ultrasound or X-ray imaging. Suggest, with reasons, which is the better procedure for this investigation.

[3]
c.

When ultrasound travels across a boundary from muscle to fat tissue, there is a decrease in acoustic impedance. This results in 1.00%1.00\%1.00% of the intensity of the incident ultrasound being reflected at the boundary.

Calculate the acoustic impedance of the fat tissue.

  • Acoustic impedance of muscle=1.65×106 kg m−2 s−1\text{Acoustic impedance of muscle} = 1.65 \times 10^6 \text{ kg m}^{-2} \text{ s}^{-1}Acoustic impedance of muscle=1.65×106 kg m−2 s−1
[4]
Markscheme

Radionuclide imaging and therapy (A-level only) Questions

  1. A Level
  2. /Physics
  3. /Radionuclide imaging and therapy (A-level only)

23 exam-style questions on AQA A Level Physics Radionuclide imaging and therapy (A-level only), covering Imaging techniques (A-level only), Half-life (A-level only), Gamma camera (A-level only), Use of high-energy X-rays (A-level only), Use of radioactive implants (A-level only), and Imaging comparisons (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.

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