| alpha particle |
A positively charged particle emitted from the nucleus of an atom, which has the same charge and mass as a helium nucleus (2 protons, 2 neutrons). Alpha particles are non-penetrating radiation and can be stopped by a piece of paper or the outer dead-cell layer of the skin. They are harmful only if the source of the particles (the radioactive material itself) is inside the body in direct contact with living tissue, eg the lungs.
출처: www.comrad.org/glossary/glos2.htm
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| alpha particle |
Two neutrons and two protons bound as a single particle that is emitted from the nucleus of certain radioactive isotopes in the process of decay.
출처: www.radon.com/pubs/homprot7.html
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| alpha particle |
Alpha particles are 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 skin. Because alpha particles cannot penetrate human skin they are not considered an "external exposure hazard" (this means that if the alpha particles stay outside the human body they cannot harm it). ...
출처: www.hps1.org/glossary/glossary.htm
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| alpha particle |
Least penetrating type of radiation. Alpha radiation can be stopped by a sheet of paper or the outer dead layer of skin, and can cause biological damage only if sufficient quantities are emitted inside the body.
출처: cleanup.inel.gov/monitoring/glossary.cfm
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| alpha particle |
a high speed, heavy particle (equivalent to a helium nucleus: 2 protons and 2 neutrons); the most energetic form of ionizing radiation, and, if present internally, the most biologically damaging form of ionizing radiation
출처: nuclear.bfn.org/glossary.htm
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