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alpha particle |
Also found in: Encyclopedia, Wikipedia, Hutchinson | 0.06 sec. |
alpha particle, a particle emitted from an atom during one kind of radioactive decay. It consists of two protons and two neutrons, the equivalent of a helium nucleus. Ordinarily, alpha particles are a weak form of radiation with a short range and are not considered hazardous unless inhaled or ingested. particle, n a small amount of material. particle, alpha, n (alpha ray, alpha radiation) a positively charged particulate ionizing radiation consisting of helium nuclei (two protons and two neutrons) traveling at high speeds. These rays are emitted from the nucleus of an unstable element. particle, beta, n (beta ray, beta radiation) a particulate ionizing radiation consisting of either negative electrons (negatrons) or positive electrons (positrons) emitted from the nucleus of an unstable element. This phenomenon is called beta decay. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| ? Mentioned in | ? References in periodicals archive | |
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Although DU is a weak alpha emitter, the
bystander effect--in which untargeted cells surrounding an irradiated
cell show damage similar to that of the target cell--may also be part of
DU's effects. Fisher of PNNL finally
constructed a cage for the alpha emitter radium-223, a decay product of
actinium-227. |
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