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Alpha particle

Video footage: Radioactive alpha particle source in a cloud chamber, the chamber is tilted a bit so that the traces move upwards for easier Becquerel counting
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Definition of the noun alpha particle

What does alpha particle mean as a name of something?


  1. a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
    • lexical domain: Natural Objects - nouns denoting natural objects (not man-made)
    • more generic terms: particle / subatomic particle = a body having finite mass and internal structure but negligible dimensions


Alpha particle: Alpha particles consist of two protons and two neutrons bound together into a particle identical to a helium nucleus. They are generally produced in the process of alpha decay, but may also be produced in other ways. Alpha particles are named after the first letter in the Greek alphabet, α. The symbol for the alpha particle is α or α²⁺.

  • also known as Alfa dalelės, Α粒子

Printed dictionaries and other books with definitions for Alpha particle

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Google previewDictionary of Physics (2014)

by Michael Chapple

alpha particle scattering experiment careful reading. The value 8 Kis probably a temperature difference; 300 Kand 292 K are probably temperatures. But we could be wrong and would need to know the context. For some quantitites algebraic ...

Google previewThe Dictionary of Homeland Security and Defense (2006)

by Margaret R. O'Leary

alpha particle A positively- charged particle (e.g., a nucleus of a helium atom) ejected from a radioactive atom, which ...

Google previewEncyclopaedia of Occupational Health and Safety (1998)

by Jeanne Mager Stellman

Ionizing Radiation Types Alpha particles An alpha particle is a tightly bound collection of two protons and two neutrons. It is identical to a helium-4 (4He) nucleus. Indeed, its ultimate fate after it loses most of its kinetic ...

Google previewIllustrated Dictionary and Resource Directory of Environmental and Occupational Health, Second Edition (2016)

by Herman Koren

atom emits an alpha particle, creating a new atom with an atomic number lower by two and an atomic mass number reduced by four. alpha-destructive distillation — The distillation of organic soils or liquids where the substance decomposes ...

Google previewEnvironmental Engineering Dictionary (2005)

by C. C. Lee

Alpha particle: A positively charged particle, consisting of two protons and two neutrons, that is emitted during radioactive decay from the nucleus of certain nuclides. it is the least penetrating of the three common types of radiation (alpha, beta, ...

Google previewRadiological Sciences Dictionary: Keywords, names and definitions (2009)

by David Dowsett

Symbol used for absorption, alpha particle, angular acceleration. alpha-decay (nmed) A process of radionuclide decay, where the nucleus loses ...

Google previewDictionary of Environmental Science and Technology (2013)

by Andrew Porteous

Alpha particle.(a-particle) An alpha particle has a positive charge, consists of two protons and two neutrons (in effect the ...

Google previewEncyclopedia of Physics (2009)

by Joe Rosen

alpha decay This is a form of RADIOACTIVITY, whereby an atomic NUCLEUS spontaneously emits a helium nucleus, also called an ALPHA PARTICLE, and thus ...

Google previewPower Industry Dictionary (1996)

by Ann Chambers, Susan D. Kerr

Alpha particle The alpha particle is composed of two protons, two neutrons, and no electrons, and thus has a charge of plus 2. Alpha particles are typically emitted from the nucleus of heavier atoms, such as uranium, thorium, and plutonium.

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