Radioactivity

Nuclear Energy

Spontaneous nuclear decay.

Radioactivity is the spontaneous transformation of unstable nuclei, emitting particles or photons.

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Radioactivity is a natural phenomenon. Unstable atom nuclei release particles: helium nuclei (alpha); electrons or positrons (beta); photons (gamma).

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Time for half of a radionuclide to decay.

Radiation that can ionize atoms.