alpha particles

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• Alpha particle — Alpha particles (named after and denoted by the first letter in the Greek alphabet, α) consist of two protons and two neutrons bound together into a particle identical to a helium nucleus; hence, it can be written as He2+ or 42He2+. They are a… …   Wikipedia

• alpha rays — alpha radiation or alpha rays noun (physics) A stream of alpha particles • • • Main Entry: ↑alpha * * * alpha rays or alpha radiation, Physics. a stream of alpha particles: »Alpha radiation consists of…high energy particles [that] have low… …   Useful english dictionary

• Alpha rays — (Physics & Chem.) Rays of relatively low penetrating power emitted by radium and other radioactive substances, and shown to consist of positively charged {alpha particles} (helium nuclei) having enormous velocities but small masses. They are… …   The Collaborative International Dictionary of English

• alpha radiation — n a stream of alpha particles * * * see under ray …   Medical dictionary

• alpha ray — n. a stream of alpha particles, less penetrating than a beta ray …   English World dictionary

• Alpha decay — 2 less. For example:(The second form is preferred because the first form appears electrically unbalanced. Fundamentally, the recoiling nucleus is very quickly stripped of two electrons to neutralize the ionized helium cation.)An alpha particle is …   Wikipedia

• Alpha particle X-ray spectrometer — APXS is also an abbreviation for APache eXtenSion tool, an extension for Apache web servers. [ Mars Pathfinder Sojourner rover] An Alpha Particle X Ray Spectrometer (APXS) (or Alpha Proton X Ray Spectrometer for the Pathfinder mission) is a… …   Wikipedia

• Alpha particle — A tiny mass of material composed of two protons and two neutrons. Alpha particles do not travel very far from their radioactive source. They cannot pass through a piece of paper, clothes or even the layer of dead cells which normally protects the …   Medical dictionary

• alpha decay — Physics. a radioactive process in which an alpha particle is emitted from the nucleus of an atom, decreasing its atomic number by two. [1935 40] * * * Type of radioactive disintegration (see radioactivity) in which some unstable atomic nuclei… …   Universalium

• alpha ray — noun the radiation of alpha particles during radioactive decay • Syn: ↑alpha radiation • Hypernyms: ↑corpuscular radiation, ↑particulate radiation, ↑ionizing radiation * * * noun 1. : an alpha particle moving a …   Useful english dictionary

• alpha particle — Physics. a positively charged particle consisting of two protons and two neutrons, emitted in radioactive decay or nuclear fission; the nucleus of a helium atom. [1900 05] * * * ▪ physics       positively charged particle, identical to the… …   Universalium