| radioactivity |
the property of some elements to emit spontaneously rays of radiant energy by the decay of their atomic nuclei
출처: sln.fi.edu/franklin/glossary.html
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| radioactivity |
The property of certain nuclides of spontaneously emitting particles or gamma radiation or of emitting x radiation following orbital electron capture or of undergoing spontaneous fission.
출처: www.oehs.wayne.edu/health%20phsics/glossaryR.html
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| radioactivity |
The spontaneous change in the nuclear structure of an atomic nucleus usually accompanied by emission of subatomic particles and/or ionising radiation. The radiation can be alpha particles (helium nuclei), beta (positive or negative) particles (high speed positrons or electrons) and gamma (electromagnetic) radiation or a combination or any two or all three. Emission of beta and alpha particles changes the chemical nature of the atom concerned. ...
출처: www.curtin.edu.au/curtin/centre/waisrc/OKLO/Access...
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| radioactivity |
the natural disintegration of the nuclei of some elements, with the emission of alpha and beta particles and sometimes gamma rays. The result is a change in the chemical status of the element involved and often the change from one element to another, resulting in a more stable nucleus. Artificial radioactivity can be caused by the bombardment of nuclei of boron and aluminium with alpha-particles. ...
출처: www.ecotao.com/holism/glosoz.htm
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| radioactivity |
Instability of the nuclei of atoms, causing them to change spontaneously to a lower energy level or to modify the number of protons and neutrons they contain. The 3 "classical" types of radioactive emissions are (1) alpha particles, nuclei of helium (2) beta-rays, fast electrons and (3) gamma-rays, high-energy photons.
출처: www-spof.gsfc.nasa.gov/Education/wgloss.html
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