Radioactive decay, also known as nuclear decay or radioactivity, is the process by which a nucleus of an unstable atom loses energy by emitting ionizing radiation. A material that spontaneously emits this kind of radiation—which includes the emission of alpha particles, beta particles, and gamma rays—is considered radioactive. Radioactive deca...
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http://en.wikipedia.org/wiki/Radioactive_decay
decrease with time, by spontaneous nuclear transformation, of the activity of a radioactive substance or a mixture of such substances
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a) a spontaneous nuclear transformation in which corpuscles or gamma radiation are emitted, or X-radiation is emitted following orbital electron capture, or the nucleus undergoes spontaneous nuclear fission b) the decrease with time, by spontaneous nuclear transformation, of the activity of a radioactive substance or a mixture of such substances
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Radioactive decay is the decrease in the intensity of radiation from a radioactive material over a period of time. Radioactive decay is important in determining when it is safe to approach an area contaminated by radioactive material without risk of radiation sickness.
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http://www.encyclo.co.uk/local/20762
<physics> The process by which a spontaneous change in nuclear state takes place. This process is accompanied by the emission of energy in various specific combinations of electromagnetic and corpuscular radiation and neutrinos. ... (16 Dec 1997) ...
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the spontaneous disintegration of the nucleus of an atom.
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Radioactive decay describes the process where by Radioactive substances decay spontaneously with the release of energy in the form of Electromagnetic Radiation or particulate radiation. The rate of radioactive decay will depend on the Half-Life .
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http://www.ionactive.co.uk/glossary_atoz.html?s=az&t=r
Natural decay of the nucleus of an atom where alpha or beta particle and/or gamma rays are released at a fixed rate.
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http://www.physicalgeography.net/physgeoglos/r.html
This refers to the disintegration of an unstable nucleus. The number of disintegrations per second taking place in the sample is called the activity of the sample. Radiation is given out when a disintegration takes place
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http://www.users.zetnet.co.uk/computing/MainPage/SecDepts/Physics/Resources
Spontaneous change in an atom by emission of of charged particles and/or gamma rays; also known as radioactive disintegration and radioactivity.
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The spontaneous change of an atomic nucleus accompanied by the emission of alpha, beta particles or gamma radiation.Alpha DecayNuclear decay by emission of an alpha particle (
4He nucleus).Beta DecayNuclear decay by emission of an electron or a positron. Positron decay is always accompanied by electron capture decay.Gamma RaysGamma ray em...
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https://www.encyclo.co.uk/local/20687
noun the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation
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Process of disintegration undergone by the nuclei of radioactive elements, such as radium and various isotopes of uranium and the transuranic elements, in order to produce a more stable nucleus. The three most common forms of radioactive decay are alpha, beta, and gamma decay. In alpha decay (the loss of a helium nucleus – two protons and two ......
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https://www.encyclo.co.uk/local/21221
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