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This lesson covers the practical uses of nuclear radiation in medicine, industry and everyday life — as required by the Edexcel GCSE Physics specification (1PH0), Topic 6: Radioactivity. You need to understand why a particular type of radiation is chosen for each application, linking your answer to the radiation's penetrating power, ionising ability, and half-life.
The type of radiation chosen for any application depends on its properties:
| Property | Alpha (α) | Beta (β) | Gamma (γ) |
|---|---|---|---|
| Ionising ability | Strong | Moderate | Weak |
| Penetrating power | Low (paper/skin) | Moderate (aluminium) | High (lead/concrete) |
| Range in air | ~5 cm | ~1 m | Effectively unlimited |
The key principle: match the radiation to the task based on what the radiation needs to pass through and what it needs to interact with.
Exam Tip: For every application, you must be able to explain WHY that specific type of radiation is used. Simply naming the type is not enough — you must link your answer to penetrating power, ionising ability and/or half-life.
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