protactinium-231–thorium-230 dating — ▪ geology method of age determination that makes use of the quantities of certain protactinium and thorium isotopes in a marine sediment. Protactinium and thorium have very similar chemical properties and appear to be precipitated at the… … Universalium
THORIUM — En 1828, Jöns Jacob Berzelius découvrit un nouveau métal qu’il baptisa thorium en l’honneur de Thor, dieu de la mythologie scandinave. Bien qu’il soit relativement rare, cet élément a été utilisé depuis longtemps dans l’industrie, principalement… … Encyclopédie Universelle
thorium processing — Introduction preparation of the ore for use in various products. Thorium (Th) is a dense (11.7 grams per cubic centimetre), silvery metal that is softer than steel. It has a high melting temperature of approximately 1,750° C (3,180°… … Universalium
Uranium-thorium dating — Uranium thorium dating, also called thorium 230 dating, uranium series disequilibrium dating or uranium series dating, is a radiometric dating technique commonly used to determine the age of carbonate materials such as speleothem or coral [ [http … Wikipedia
Isotopes du thorium — Le thorium (Th) comme tous les éléments de numéro atomique supérieur à celui du plomb, ne possède aucun isotope stable. Cependant, il possède six isotopes présent dans la nature et l un d eux, le thorium 232 (232Th), est relativement stable, avec … Wikipédia en Français
ionium-thorium dating — ▪ physics method of establishing the time of origin of marine sediments according to the amount of ionium and thorium they contain. Because uranium compounds are soluble in seawater, while thorium compounds are quite insoluble, the… … Universalium
Торий-230 — Таблица нуклидов Общие сведения Название, символ Торий 230, 230Th Альтернативные названия ионий, Io Нейтронов 140 Протонов 90 Свойства нуклида Атомная масса 230,03 … Википедия
Principal cosmogenic and uranium-thorium series radioisotopes — ▪ Table Principal cosmogenic and uranium thorium series radioisotopes radioisotope half life in years principal uses Cosmogenic isotope beryllium 10 1.5(106) dating marine sediment, manganese nodules, glacial ice, quartz in rock exposures,… … Universalium
dating — I In geology and archaeology, the process of determining an object s or event s place within a chronological scheme. Scientists may use either relative dating, in which items are sequenced on the basis of stratigraphic clues (see stratigraphy) or … Universalium
Isotopes du protactinium — Le protactinium (Pa), comme tous les éléments de numéro atomique supérieur à celui du plomb, ne possède aucun isotope stable. Cependant, il possède trois isotopes présent dans la nature, ce qui permet de lui attribuer une masse atomique standard … Wikipédia en Français
