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GCSE Physics · key term
Very high-frequency electromagnetic radiation emitted when a nucleus loses excess energy.
Used by Edexcel and OCR
Specification 6.10, 6.16, 6.21 · Paper 1
High-energy electromagnetic radiation emitted from an unstable nucleus.
High-frequency electromagnetic radiation emitted from unstable nuclei.
High-energy electromagnetic radiation emitted by a nucleus as it loses excess energy.
Do not say that gamma radiation is completely stopped by lead. Thick lead or concrete reduces its intensity; some gamma photons may still pass through.
Do not say that the nucleus loses protons or neutrons when it emits gamma radiation. Its atomic number and mass number are unchanged.
If asked where gamma radiation comes from, state that it is emitted by the nucleus as the nucleus loses excess energy—not by electrons changing orbit.
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Specification P6.1e, P6.1i · Paper 2 (Foundation), Paper 4 (Higher)
High-frequency electromagnetic radiation that can carry excess energy away from a nucleus.
Revise: Emission effectsSome unstable nuclei emit particles, while others release energy as gamma radiation. What leaves the nucleus determines what remains.
Electromagnetic radiation emitted during a change in an unstable or excited nucleus.
Paper 1, Paper 2
Revise: Isotopes and Radioactive EmissionsGamma radiation may also accompany alpha or beta emission.
High-frequency electromagnetic radiation that may carry energy away from a nuclear change.