Edexcel IGCSE Physics 7.12 Half-life

Practise defining half-life clearly and using it to compare how quickly different radioactive isotopes decay in context.

Exam points

state half-life as the time for activity, count rate or undecayed nuclei to halve
apply short half-life reasoning to explain why an isotope cannot be stored or transported for long

[Maximum number: 2]

This question is about radioactive isotopes used for medical imaging.

lodine-131 is represented by this symbol.

{ }_{53}^{131} \mathrm{I}

Iodine-131 is radioactive and decays with a half-life of 8 days.

State what is meant by the term half-life.

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