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Definition of Beta particle

Babylon English

electron in a beta ray, high-speed electron or positron, electron or positron ejected from the nucleus of an atom during radioactive decay
electrons or positrons ejected from an atom's nucleus during radioactive decay
Beta particle Definition from Business & Finance Dictionaries & Glossaries
Glossary of petroleum Industry
one of the extremely small particles, sometimes called rays, emitted from the nucleus of a radioactive substance such as radium or uranium as it disintegrates. Beta particles have a negative charge.
Beta particle Definition from Science & Technology Dictionaries & Glossaries
General Chemistry Glossary
 Say it 
(ß-) An electron emitted by an unstable nucleus , when a neutron decays into a proton and an electron. In some cases, beta radiation consists of positrons ("antielectrons" which are identical to electrons but carry a +1 charge.") Note that beta particles are created in nuclear decay; they do not exist as independent particles within the nucleus.
NRC Nuclear Energy Glossary
A charged particle emitted from a nucleus during radioactive decay, with a mass equal to 1/1837 that of a proton. A negatively charged beta particle is identical to an electron. A positively charged beta particle is called a positron. Large amounts of beta radiation may cause skin burns, and beta emitters are harmful if they enter the body. Beta particles may be stopped by thin sheets of metal or plastic.
A service to the public by The U.S. Nuclear Regulatory Commission (NRC).
ASTRONOMY UNBOUND
A high speed electron emitted in a form of radioactive disintegration from an atomic nucleus which has a surfeit of electric charge and energy. The mechanism involves the conversion of one type of nucleon  into another and the creation of an electron ( no  electrons can exist in the nucleus (the so-called Klein paradox  )). The beta particle is emitted at high speed at any one energy up to a maximum which is unique to the radio-nuclide. Likewise the half life is characteristic. Energy is conserved by the simultaneous emission of a neutrino with very little (or no mass) that travels close to (or at the speed of light). An example of the equation of 'nuclear chemistry' that illustrates negative beta decay is the deacy of tritium with a 13 year half-life 1H3 -> 2He3 + -e + antineutrino
If the electron emitted is the antimatter counterpart or positron then there must first be an excess of internal energy in the nucleus greater than the rest mass energy of two electrons (i.e. 2 m c2). An 'ordinary' matter neutrino shares energy with the positive electron. For example: 8O15 + (2 m c2) -> 7N15 + +e + neutrino
Beta particle Definition from Encyclopedia Dictionaries & Glossaries
Wikipedia English - The Free Encyclopedia
Beta particles are high-energy, high-speed electrons or positrons emitted by certain types of radioactive nuclei such as potassium-40. The beta particles emitted are a form of ionizing radiation also known as beta rays. The production of beta particles is termed beta decay. They are designated by the Greek letter beta (ß). There are two forms of beta decay, ß- and ß+, which respectively give rise to the electron and the positron.

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Beta particle Definition from Entertainment & Music Dictionaries & Glossaries
English to Federation-Standard Golic Vulcan
tih-pi'gal
Beta particle Definition from Language, Idioms & Slang Dictionaries & Glossaries
WordNet 2.0

Noun
1. a high-speed electron or positron emitted in the decay of a radioactive isotope
(hypernym) particle