Definition of alpha particle in English:

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alpha particle

Pronunciation:

noun

Physics
A helium nucleus emitted by some radioactive substances, originally regarded as a ray.
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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