Definition of alpha particle in English:

alpha particle

Syllabification: al·pha par·ti·cle


  • A helium nucleus emitted by some radioactive substances, originally regarded as a ray.
    More example sentences
    • Because the alpha particle (the helium nucleus) with two protons and two neutrons is especially cohesive, the release of nuclear material is often in this form.
    • The alpha particle is emitted by certain radioactive elements as they decay to a stable element.
    • A beta particle is an electron that could make it just a little way into the skin, while an alpha particle is a charged helium nucleus that will bounce right off of you.

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