alpha particle
positively charged particle made up of two protons and two neutrons, nucleus of a helium atom | ||||
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Alpha particle Definition from Computer & Internet Dictionaries & Glossaries
Alpha particle Definition from Language, Idioms & Slang Dictionaries & Glossaries
| WordNet 2.0 |
alpha particle
Noun
1. a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
(hypernym) particle
Noun
1. a positively charged particle that is the nucleus of the helium atom; emitted from natural or radioactive isotopes
(hypernym) particle
Alpha particle Definition from Science & Technology Dictionaries & Glossaries
| NRC Nuclear Energy Glossary |
Alpha particle
A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an electrostatic charge of +2. It has low penetrating power and a short range (a few centimeters in air). The most energetic alpha particle will generally fail to penetrate the dead layers of cells covering the skin and can be easily stopped by a sheet of paper. Alpha particles are hazardous when an alpha-emitting isotope is inside the body.
A positively charged particle ejected spontaneously from the nuclei of some radioactive elements. It is identical to a helium nucleus that has a mass number of 4 and an electrostatic charge of +2. It has low penetrating power and a short range (a few centimeters in air). The most energetic alpha particle will generally fail to penetrate the dead layers of cells covering the skin and can be easily stopped by a sheet of paper. Alpha particles are hazardous when an alpha-emitting isotope is inside the body.
| ASTRONOMY UNBOUND |
Alpha particle
The fast moving nucleus of a helium atom. It is emitted in one type of radioactivity known as alpha decay. The nucleus has too much energy and too many protons but finds it energetically most feasible to eject a preformed helium nucleus rather than emit a proton. The alpha particle is monoenergetic and its energy, and also the half life, uniquely identify the radionuclide. Naturally occurring alpha particle emitters are heavier than lead (Z=82). See also atomic nucleus.
The fast moving nucleus of a helium atom. It is emitted in one type of radioactivity known as alpha decay. The nucleus has too much energy and too many protons but finds it energetically most feasible to eject a preformed helium nucleus rather than emit a proton. The alpha particle is monoenergetic and its energy, and also the half life, uniquely identify the radionuclide. Naturally occurring alpha particle emitters are heavier than lead (Z=82). See also atomic nucleus.
| Technical English by wpv |
Alpha Particle
The nuclei of a helium (with two neutrons and two protons each) that are discharged by radioactive decay of many heavy elements, such as uranium-238 and plutonium-239.
The nuclei of a helium (with two neutrons and two protons each) that are discharged by radioactive decay of many heavy elements, such as uranium-238 and plutonium-239.
| Physical Geography Terms and Meanings |
Alpha Particle
Particle of matter that is positively charged. This particle consists of two neutrons and two protons and is emitted as a form of radioactivity from the nuclei of some radioisotopes. Also see beta particle and gamma rays.
Particle of matter that is positively charged. This particle consists of two neutrons and two protons and is emitted as a form of radioactivity from the nuclei of some radioisotopes. Also see beta particle and gamma rays.
| General Chemistry Glossary |
alpha particle
Say it
(42He) A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 655 98 × 10-27 kg or 4.001 506 1747 atomic mass units . [1998 CODATA values ]
(42He) A particle that is commonly ejected from radioactive nuclei, consisting of two protons and two neutrons. Alpha particles are helium nuclei. Alpha particles have a mass of 6.644 655 98 × 10-27 kg or 4.001 506 1747 atomic mass units . [1998 CODATA values ]
Alpha particle Definition from Business & Finance Dictionaries & Glossaries
| Glossary of petroleum Industry |
alpha particle
one of the extremely small particles of an atom that is ejected from a radioactive substance (as radium or uranium) as it 'disintegrates. Alpha particles have a positive charge.
one of the extremely small particles of an atom that is ejected from a radioactive substance (as radium or uranium) as it 'disintegrates. Alpha particles have a positive charge.
Alpha particle Definition from Entertainment & Music Dictionaries & Glossaries
| English to Federation-Standard Golic Vulcan |
Alpha particle
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Alpha particle Definition from Medicine Dictionaries & Glossaries
| CDC Radiological Terms |
Alpha particle
the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry more energy than gamma or beta particles, and deposit that energy very quickly while passing through tissue. Alpha particles can be stopped by a thin layer of light material, such as a sheet of paper, and cannot penetrate the outer, dead layer of skin. Therefore, they do not damage living tissue when outside the body. When alpha-emitting atoms are inhaled or swallowed, however, they are especially damaging because they transfer relatively large amounts of ionizing energy to living cells. See also beta particle, gamma ray, neutron, x-ray.
the nucleus of a helium atom, made up of two neutrons and two protons with a charge of +2. Certain radioactive nuclei emit alpha particles. Alpha particles generally carry more energy than gamma or beta particles, and deposit that energy very quickly while passing through tissue. Alpha particles can be stopped by a thin layer of light material, such as a sheet of paper, and cannot penetrate the outer, dead layer of skin. Therefore, they do not damage living tissue when outside the body. When alpha-emitting atoms are inhaled or swallowed, however, they are especially damaging because they transfer relatively large amounts of ionizing energy to living cells. See also beta particle, gamma ray, neutron, x-ray.
Alpha particle Definition from Encyclopedia Dictionaries & Glossaries
| Wikipedia English - The Free Encyclopedia |
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 42He. They are a highly ionizing form of particle radiation, and have low penetration. The alpha particle mass is 6.644656×10-27 kg, which is equivalent to the energy of 3.72738 GeV. The charge of an alpha particle is equal to +2e, where e is the magnitude of charge on an electron, e=1.602176462x10-19C.
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