isotope dilution technique

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• isotope dilution — noun Any technique that involves the addition to a sample of an isotopically labelled compound. Syn: isotopic dilution …   Wiktionary

• Isotopic dilution — is a technique to increase the precision and accuracy of chemical analysis. First, a known amount of an isotope is added to the sample. For example, to determine the amount of lead in a sample, a known amount of Pb 204, one of the isotopes of… …   Wikipedia

• isotopic dilution — noun any technique that involves the addition to a sample of an isotopically labelled compound Syn: isotope dilution …   Wiktionary

• 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

• analysis — /euh nal euh sis/, n., pl. analyses / seez /. 1. the separating of any material or abstract entity into its constituent elements (opposed to synthesis). 2. this process as a method of studying the nature of something or of determining its… …   Universalium

• mass spectrometry — or mass spectroscopy Analytic technique by which chemical substances are identified by sorting gaseous ions by mass using electric and magnetic fields. A mass spectrometer uses electrical means to detect the sorted ions, while a mass spectrograph …   Universalium

• Inductively coupled plasma mass spectrometry — ICP MS Instrument Acronym ICP MS Classification Mass spectrometry Analytes atomic and polyatomic species in plasma, with exceptions; usually inte …   Wikipedia

• Doubly-labeled water — is water in which both the hydrogen and the oxygen has been partly or completely replaced for tracking purposes (i.e., labeled ) with an uncommon isotope of these elements.In theory, radioactive forms of hydrogen and oxygen could be used for such …   Wikipedia

• Uranium-lead dating — Uranium lead is one of the oldest and most refined radiometric dating schemes, with a routine age range of about 1 million years to over 4.5 billion years, and with routine precisions in the 0.1 1 percent range. [Parrish, Randall R.; Noble,… …   Wikipedia

• isotopic tracer — ▪ chemistry       any radioactive atom detectable in a material in a chemical, biological, or physical system and used to mark that material for study, to observe its progress through the system, or to determine its distribution. An isotopic… …   Universalium

• Thomas Edvard Krogh — Thomas Edvard Tom Krogh, FRSC (1936 ndash; April 29, 2008) was a geochronologist and a former curator for the Royal Ontario Museum. He revolutionized the technique of radiometric uranium lead dating with the development of new laboratory… …   Wikipedia