Lesson 12.2: Alpha, Beta, & Gamma Decay Summary

Key Concepts: Alpha Beta & Gamma Decay

Core Definitions

  • Alpha Decay (α): Emission of a helium-4 nucleus (²₄He). Atomic number decreases by 2, mass number by 4.
  • Beta Decay (β): A neutron converts to a proton and emits an electron (⁰₋₁e). Atomic number increases by 1.
  • Gamma Decay (γ): Emission of high-energy electromagnetic radiation. No change in atomic or mass number.
  • Penetrating Power: α < β < γ. Alpha stopped by paper; beta by aluminum; gamma by lead/concrete.
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