To pass gradually from a sound, prosperous, or perfect state, to one of imperfection, adversity, or dissolution; to waste away; to decline; to fail; to become weak, corrupt, or disintegrated; to rot; to perish; as, a tree decays; fortunes decay; hopes decay
the organic phenomenon of rotting a gradual decrease; as of stored charge or current the process of gradually becoming inferior the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation an inferior state resulting from the process of decaying; "the corpse was in an advanced state of decay"; "the house had fallen into a serious state of decay and disrepair"
Gradual failure of health, strength, soundness, prosperity, or of any species of excellence or perfection; tendency toward dissolution or extinction; corruption; rottenness; decline; deterioration; as, the decay of the body; the decay of virtue; the decay of the Roman empire; a castle in decay
The second of the four segments of a typical ADSR envelope The decay control determines the amount of time it takes for the envelope to fall from the peak reached at the end of the attack segment to the sustain level See ADSR
If something such as a society, system, or institution decays, it gradually becomes weaker or its condition gets worse. Popular cinema seems to have decayed Decay is also a noun. There are problems of urban decay and gang violence. tooth decay alpha decay beta decay gamma decay
When something such as a dead body, a dead plant, or a tooth decays, it is gradually destroyed by a natural process. The bodies buried in the fine ash slowly decayed The ground was scattered with decaying leaves. = rot Decay is also a noun. When not removed, plaque causes tooth decay and gum disease. + decayed de·cayed decayed teeth. = rotten
The decrease in activity of any radioactive material with the passage of time due to the spontaneous emission from the atomic nuclei of either alpha or beta particles, sometimes accompanied by gamma radiation See Half-life, Radioactivity
The decrease in activity of any radionuclide [see radionuclide definition] over time, due to spontaneous emission of radiation from its atomic nuclei of either alpha particles [see alpha particles definition], beta particles [see definition] or gamma rays [see definition] The rate of decay for a radionuclide is related to its half-life [see half-life definition] (FEMA- Rep-5, 1992 ) Back to Top
Decrease of a radioactive substance because of nuclear emission of alpha or beta particles, positrons, or gamma rays See radioactivity In beta decay, for example, the emission of a -particle, i e , an electron, causes radioactive change into a daughter element of the same atomic weight as the parent element but of atomic number higher by 1
The change of one radioactive nuclide into a different nuclide by the spontaneous emission of alpha, beta, or gamma radiation, or by electron capture The end product is a less energetic, more stable nucleus Each decay process has a definite half-life
The change of one radioactive nuclide into a different nuclide by the spontaneous emission of alpha, beta, or gamma rays, or by electron capture The end product is a less energetic, more stable nucleus Each decay process has a definite half-life
The decrease in the amount of any radioactive material with the passage of time due to spontaneous emission from the atomic nuclei of either alpha or beta particles, often accompanied by gamma radiation Every radionuclide has a definite half-life
Disintegration of atomic nuclei resulting in the emission of alpha or beta particles (usually with gamma radiation) Also the exponential decrease in radioactivity of a material as nuclear disintegrations take place and more stable nuclei are formed
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