1) Emission 2) Radiation
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radiation; radioactive. Spontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms. 'Radiation' refers to the emissions, and 'radioactive source' refers to the source of the radiation.
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http://antoine.frostburg.edu/chem/senese/101/glossary/r.shtml
the quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83, and possible of induction in all other known elements.
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property exhibited by certain types of matter of emitting energy and subatomic particles spontaneously. It is, in essence, an attribute of individual ... [45 related articles]
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http://www.britannica.com/eb/a-z/r/4
The spontaneous breaking apart, or decay, of unstable atomic nuclei. The three types of radioactive emission are alpha particles (nuclei of helium, which corresponds to a decrease in mass of the nucleus by four units), beta particles (fast-moving electrons, which corresponds to an increase in atomic...
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http://www.daviddarling.info/encyclopedia/R/radioactivity.html
property of certain nuclides of spontaneously emitting particles, gamma radiation, or X radiation NOTE - An element which presents radioactivity is called radioactive.
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=393-12-43
the property of certain nuclides of spontaneously emitting corpuscles or gamma radiation, or of emitting X-radiation following orbital electron capture, or of undergoing spontaneous nuclear fission
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http://www.electropedia.org/iev/iev.nsf/display?openform&ievref=881-02-26
The property of radionuclides of spontaneously emitting ionising radiation.
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http://www.encyclo.co.uk/local/20474
Radioactivity refers to alpha and beta particles as well as gamma rays emitted from an unstable isotopes atomic nuclei. Exposure to high levels of radioactivity can lead to radiation sickness.
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http://www.encyclo.co.uk/local/20762
<radiobiology> The quality of emitting or the emission of corpuscular or electromagnetic radiations consequent to nuclear disintegration, a natural property of all chemical elements of atomic number above 83 and possible of induction in all other known elements. ... (18 Nov 1997) ...
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http://www.encyclo.co.uk/local/20973
(ra″de-o-ak-tiv´ĭ-te) the emission of particulate or electromagnetic radiation as a result of decay of the nuclei of unstable elements, a property of all chemical elements of atomic number above 83, and possibly inducible in all other known elements. the quality of having such emissions.
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http://www.encyclo.co.uk/local/21001
the process of spontaneous transformation of the nucleus, generally with the emission of alpha or beta particles often accompanied by gamma rays. This process is referred to as decay or disintegration of an atom.
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http://www.encyclo.co.uk/local/21808
The effect of radioactive material, emitting alpha, beta, and gamma rays. Also used to describe in present tense the nature of radioactive material.
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http://www.encyclo.co.uk/local/22291
The spontaneous release of energy from atomic nuclei.
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http://www.fisicx.com/quickreference/science/glossary.html
Radioactivity is the spontaneous disintegration of an atomic nucleus to produce more stable nucleus and accompanied by the emission of charged particles and possibly also gamma rays.
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http://www.probertencyclopaedia.com/browse/GR.HTM
See Activity
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http://www.users.zetnet.co.uk/computing/MainPage/SecDepts/Physics/Resources
It is the spontaneous alteration, or decay, of the nuclei of radioactive atoms, accompanied by the emission of radiation.
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http://www.vidyagyaan.com/general-knowledge/science/glossary-of-physics-ter
Some elements give off a Geiger counter reading of radioactivity. The most common mineral being pitchblende, a main ore of uranium.
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https://www.encyclo.co.uk/local/20501
Click images to enlargeSpontaneous change of the nuclei of atoms accompanied by the emission of radiation. Such atoms are called radioactive. It is the property exhibited by the radioactive isotopes of stable elements and all isotopes of radioactive elements, and can be either natural or induced. See radioactive decay. A ...
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https://www.encyclo.co.uk/local/21221
The property of spontaneously emitting alpha, beta, and/or gamma radiation as a result of nuclear disintegration.
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https://www.encyclo.co.uk/local/21257
See what is Radioactivity.
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https://www.encyclo.co.uk/local/22233
the emission of subatomic particles from a nucleus.
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https://www.encyclo.co.uk/local/22434
The property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms.
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https://www.encyclo.co.uk/local/22709
The property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms.
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https://www.encyclo.co.uk/local/22733
The property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms.
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https://www.encyclo.co.uk/local/22734
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