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radioactivity1) The effect of radioactive material, emitting alpha rays, beta rays, and gamma rays. 2) Also used to describe in present tense the nature of radioactive material.
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radioactivity The spontaneous emission of radiation from the nucleus of an atom. Radionuclides lose particles and energy through this process.
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radioactivitySpontaneous emission of particles or high-energy electromagnetic radiation from the nuclei of unstable atoms. "Radiation" refers to the emissions, and "radioactive source" refers t [..]
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radioactivityNaturally occurring nuclides which are radioactive. A distinction is drawn between natural radionuclides which are continuously regenerated by nuclear reactions of cosmic radiation, cosmogenic radionu [..]
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radioactivityProperty of certain substances to convert without external effect, emitting a characteristic radiation. Radioactivity was discovered for uranium by Becquerel in 1896. If the substances, or to be more [..]
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radioactivityThe spontaneous decay of the nucleus of an element. It involves the change in the number of protons in the nucleus and therefore creates an atom of a new element.
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radioactivity1899, from French radioactivité, coined 1898 by the Curies; see radioactive.
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radioactivityThe disintegration of unstable heavy atomic nuclei into lighter, more stable, atomic nuclei, accompanied in the process by the emission of ionizing radiation (alpha particles, beta particles or gamma [..]
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radioactivityemission of energetic particles by some elements or isotopes.
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radioactivityThe spontaneous transition of an atomic nucleus to a lower energy state (radioactive decay) accompanied by the emission of an alpha particle, a beta particle, or gamma radiation. Alpha emission result [..]
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radioactivityThe spontaneous decay of certain rare, unstable, atomic nuclei into more stable atomic nuclei. A natural by-product of this process is the release of energy.
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radioactivityradiation: the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay (radioactive) exhibiting or caused by radioactivity; "radioactive isotope&quo [..]
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radioactivityThe spontaneous emission of radiation, generally alpha or beta particles, often accompanied by gamma rays, from the nuclei of an unstable isotope. As a result of this emission the radioactive isotope [..]
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radioactivityThe spontaneous emission of radiation, generally alpha or beta particles, often accompanied by gamma rays, from the nucleus of an unstable isotope.
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radioactivitySpontaneous decay of atomic nuclei. An unstable nucleus may decay to one or more lighter nuclei. During the process radiation is emitted. There are three types of radioactive emissions: alpha particles (nuclei of helium), beta-rays (fast electrons) and gamma rays (high-energy photons). In the Universe radioactive atoms are formed in supernova explo [..]
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radioactivityThe emission of radiation by unstable atoms in the form of particles and rays. radioisotope
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radioactivityradioactivity (pop)
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radioactivityThe 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 po [..]
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radioactivity The spontaneous release of energy from atomic nuclei.
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radioactivityThe spontaneous decay of an unstable atomic nucleus, giving rise to the emission of radiation.
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radioactivityspontaneous emission of radiation, either directly from unstable atomic nuclei or as a consequence of a nuclear reaction.
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radioactivityThe spontaneous process of a sample of a radionuclide undergoing a change by the emission of particles or rays.
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radioactivityThe ability of certain nuclides to emit particles, gamma rays or x-rays during their spontaneous decay into other nuclei. The final outcome of radioactive decay is a stable nuclide.
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radioactivityprocess by which an unstable nucleus gives off nuclear radiation. radiometric dating -
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radioactivityThe random release of matter or energy from the nucleus of an unstable atom.
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radioactivityThe spontaneous breakdown of an atomic nucleus with the emission of particles and rays.
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radioactivitySpontaneous emission of particles or energy from an atomic nucleus as it disintegrates
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radioactivityThe decay (disintegration) of atomic nuclei, giving rise to alpha, beta and/or gamma radiation. See Activity.
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radioactivityThe spontaneous decay of disintegration of an unstable atomic nucleus accompanied by the emission of radiation.
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radioactivityHP See Activity.
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radioactivitySpontaneous emission of radiation as a consequence of a nuclear reaction, or directly from the breakdown of an unstable nucleus. The radiation so emitted; including gamma rays, alpha particles, neutro [..]
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radioactivityThe process of undergoing the transformation of an unstable nucleus by the spontaneous emission of radiation, generally alpha or beta particles, often accompanied by gamma rays, from the nucleus of an [..]
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radioactivity(n) the spontaneous emission of a stream of particles or electromagnetic rays in nuclear decay
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radioactivityIs the emission of radiation from an unstable atomic nucleus. This emission of energy is called radioactive decay. The radiation can be emitted in the form of a positively charged alpha particle (a), a negatively charged beta particle(ß), or gamma rays . [more]
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radioactivityTerm describing the spontaneous decay of some nuclei (Martin).
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radioactivityThe property of a radionuclide to spontaneously emit ionising radiation. It arises from the breakdown of an unstable nucleus
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radioactivityDiscovered by French physicist Henri Becquerel in 1896, a natural phenomenon whereby unstable atomic nuclei split into two (sometimes three) lighter nuclei, releasing high-energy electromagnetic waves [..]
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radioactivityThe decay of an unstable atomic nucleus or isotope.
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radioactivitythe spontaneous decomposition of an unstable element, with the simultaneous emission of rays of particles.
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radioactivityRadioactivity occurs when the nucleus of an atom breaks up into two or more pieces. A neutron is often released during radioactive decay. More Information: Radioactivity
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radioactivityInstability of some atomic nuclei, 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 [..]
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radioactivityThe spontaneous transformation of a nuclide into one or more different nuclides, accompanied by either the emission of particles from the nucleus, nuclear capture or ejection of orbital Electrons, or [..]
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radioactivityThe property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms. Reconnaissance
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radioactivityThe 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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radioactivityEnergy in the form of alpha, beta, and gamma radiation that is emitted by certain minerals with unstable nuclei, such as those containing the elements radium, thorium, and uranium.
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radioactivityThe property of spontaneously emitting alpha, beta or gamma rays by the decay of the nuclei of atoms. Radon survey
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radioactivityThe spontaneous decay of certain rare, unstable, atomic nuclei into more stable atomic nuclei. A natural by-product of this process is the release of energy.
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radioactivityRadioactivity is the property of a nucleus in unstable atoms that causes them to spontaneously release energy in the form of photons (e.g., gamma rays) or subatomic particles (e.g., alpha or beta part [..]
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radioactivityA property exhibited by unstable isotopes of elements that decay, emitting radiation, principally as α─particles, ί─particles, and Γ─rays.
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radioactivity|Radioactivity
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radioactivityThe emission of ionising radiation or particles caused by the natural disintegration of atomic nuclei.
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radioactivityThe property possessed by some elements (such as uranium) of spontaneously emitting energy in the form of radiation as a result of the decay (or disintegration) of an unstable atom. Radioactivity is also the term used to describe the rate at which radioactive material emits radiation. Radioactivity is measured in curies (Ci), becquerels (Bq), or di [..]
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radioactivitySee what is Radioactivity.
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radioactivityThe spontaneous decay of certain rare, unstable, atomic nuclei into more stable atomic nuclei. A natural by-product of this process is the release of energy.
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