spontaneous disintegration

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• disintegration — [dis in΄tə grā′shən] n. 1. the act or process of disintegrating 2. Nuclear Physics any change in a nucleus of an atom, whether spontaneous or induced, in which one or more particles, photons, etc. are emitted …   English World dictionary

• Positive Disintegration — The Theory of Positive Disintegration (TPD) by Kazimierz Dąbrowski describes a theory of personality development. Unlike mainstream psychology, Dąbrowski s theoretical framework views psychological tension and anxiety as necessary for growth.… …   Wikipedia

• radioactive decay — noun the spontaneous disintegration of a radioactive substance along with the emission of ionizing radiation • Syn: ↑decay, ↑disintegration • Derivationally related forms: ↑disintegrate (for: ↑disintegration), ↑decay ( …   Useful english dictionary

• decay — [dē kā′, dikā′] vi. [ME decaien < Anglo Fr & OFr decäir < VL * decadere: see DECADENCE] 1. to lose strength, soundness, health, beauty, prosperity, etc. gradually; waste away; deteriorate 2. to rot or decompose 3. to undergo radioactive… …   English World dictionary

• decay — 1. Destruction of an organic substance by slow combustion or gradual oxidation. 2. SYN: putrefaction. 3. To deteriorate; to undergo slow combustion or putrefaction. 4. In dentistry, caries. 5. In psychology, loss of informat …   Medical dictionary

• Ernest Rutherford — Infobox Scientist name = Ernest Rutherford birth date = birth date|df=yes|1871|8|30 birth place = Brightwater, New Zealand death date = death date and age|df=yes|1937|10|19|1871|8|30 death place = Cambridge, England nationality = New Zealand… …   Wikipedia

• radioactivedecay — radioactive decay n. 1. Spontaneous disintegration of a radionuclide accompanied by the emission of ionizing radiation in the form of alpha or beta particles or gamma rays. 2. An instance of such disintegration. * * * …   Universalium

• geochronology — geochronologic /jee oh kron l oj ik/, geochronological, adj. geochronologist, n. /jee oh kreuh nol euh jee/, n. the chronology of the earth, as based on both absolute and relative methods of age determination. [1890 95; GEO + CHRONOLOGY] * * *… …   Universalium

• radioactivity — /ˌreɪdioʊækˈtɪvəti / (say .raydeeohak tivuhtee) noun the property of spontaneous disintegration possessed by certain elements due to changes in their atomic nuclei. The disintegration is accompanied by the emission of alpha, beta, or gamma… …  

• decay — I. verb Etymology: Middle English, from Anglo French decaïr, from Late Latin decadere to fall, sink, from Latin de + cadere to fall more at chance Date: 15th century intransitive verb 1. to decline from a sound or prosperous condition 2. to… …   New Collegiate Dictionary

• helium — /hee lee euhm/, n. an inert, gaseous element present in the sun s atmosphere and in natural gas, and also occurring as a radioactive decomposition product, used as a substitute for flammable gases in dirigible balloons. Symbol: He; at. wt.:… …   Universalium