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  1. Radioactivity | Definition, Types, Applications, & Facts | Britannica

  2. Atom - Radioactivity, Particles, Discovery | Britannica

  3. Radioactivity - Natural, Artificial, Decay | Britannica

  4. Radiation | Definition, Types, Effects, & Facts | Britannica

  5. Radioactivity - Medical, Industrial, Research | Britannica

  6. radioactivity - Kids | Britannica Kids | Homework Help

  7. Radioactivity - Calculation, Measurement, Energy | Britannica

  8. French Physicist & Radioactivity Pioneer - Britannica

  9. Radioactivity - Beta Decay, Nuclear Reactions, Radiation | Britannica

  10. Half-life | Definition & Facts | Britannica