Edexcel IGCSE Physics 7.5 Alpha Beta and Gamma Radiation Questions

Identify alpha particles, beta particles and gamma rays, then use absorber or cloud-chamber evidence to compare their properties.

Exam points

Identify α particles as helium nuclei, β⁻ particles as high-energy electrons and γ rays as electromagnetic waves.
Compare α, β⁻ and γ by their relative penetrating power and ionising ability.
Use absorber, detector or cloud-chamber evidence to identify radiation and infer its penetration or ionising effects.

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This question is about radioactive isotopes used for medical imaging.

When iodine-131 decays, it emits beta radiation and gamma radiation.

A patient swallows a tablet containing iodine-131. The radiation emitted can be detected outside the body.

Give a reason why gamma radiation is more likely to be detected outside the body than beta radiation.

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Edexcel IGCSE Physics 7.5 Alpha Beta and Gamma Radiation Questions question 1