plumiHalf-life: AQA A‑Level Physics questions
AQA A-Level Physics past-paper questions on 3.10.6.2 Half-life, 2008–2025, with mark schemes and examiner’s reports where available.
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Q04.1
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All 7 questions on Half-life, as a list
- June 2024, Paper 3 Medical physics, Q04.1 (2 marks): Explain what is meant by this statement. [2 marks]
- June 2024, Paper 3 Medical physics, Q04.2 (3 marks): The physical half-life of fluorine-18 is 110 minutes. Calculate the percentage of fluorine-18 that remains in the person 4.0 hours after it is injected. [3 mark
- November 2021, Paper 3 Medical physics, Q01.4 (4 marks): Iodine-131 is a medical tracer that can be detected using a gamma camera. Iodine-131 has a physical half-life of 8.0 days. A patient is injected with iodine-131
- June 2017, Paper 3 Medical physics, Q03.2 (1 mark): The radionuclide used in the PET scan has a physical half-life of 110 minutes. The radionuclide is excreted from the body with a biological half-life of 185 min
- June 2017, Paper 3 Medical physics, Q03.3 (3 marks): Discuss what might be a suitable length of time for the patient to relax between injecting the radionuclide and moving the patient into the PET scanner. [3 mark
- Specimen, Paper 3 Medical physics, Q04.1 (2 marks): Explain why the effective half-life of a radionuclide in a biological system is always less than the physical half-life. [2 marks] 0 4 . 1
- Specimen, Paper 3 Medical physics, Q04.2 (4 marks): The physical half-life of a radionuclide is 20 days. The nuclide was administered to a patient. Initially the corrected count rate at the patient’s body was 270
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