alpha vs beta penetration

Question

Relative penetration power (highest)?

RankGuru · Accepted Answer

1. **Comparison Matrix**:
   - **Alpha ($\alpha$)**: Heavy, charged ($+2e$). Interacts strongly with matter, hence very **low** penetration (stopped by paper).
   - **Beta ($\beta$)**: Light, charged ($-e$ or $+e$). Moderate penetration (stopped by thin aluminum sheet).
   - **Gamma ($\gamma$)**: Electromagnetic radiation (photons), Neutral. Interacts weakly, hence **highest** penetration (requires thick lead or concrete to stop).
2. **Inverse Rule**: Penetrating power is generally inversely related to ionizing power. Since Gamma is least ionizing, it is most penetrating.

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alpha vs beta penetration

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