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Lessons for this topic haven’t been written yet. The objectives below show exactly what the syllabus expects, so you can plan with them in the meantime.
What Cambridge says you should be able to do, in our words. Codes are the topic number plus the objective’s position.
Understand that a tracer is a substance containing radioactive nuclei which can be introduced into the body and is then absorbed by the tissue under study.
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Recall that positron emission tomography (PET scanning) uses a tracer that decays by β⁺ decay.
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Understand that annihilation happens when a particle and its antiparticle interact, and that mass–energy and momentum are conserved in this process.
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Explain that, in PET scanning, positrons emitted by the decay of the tracer annihilate when they interact with electrons in the tissue, giving a pair of gamma-ray photons travelling in opposite directions.
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Calculate the energy of the gamma-ray photons produced when an electron–positron pair annihilates.
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Understand that the gamma-ray photons from an annihilation event leave the body and can be detected, and that processing their arrival times allows an image of the tracer concentration in the tissue to be created.
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