A substance added to reservoir fluid and/or injected fluid to permit the movements of the fluid to be followed or traced. (PGR)
Molecule or atom that has been labeled either chemically or radioactively so that it can be followed in a biochemical process or readily located in a cell or tissue.
Additive to facilitate location of deposit eg. radioactive or fluorescent material.
a radioactive nuclide used to follow the movement of material in a reaction or process. trans-2-pentene trans configuration: a term applied to geometric isomers; it denotes an arrangement in which the substituted groups are on opposite sides of the double bond. (see cis configuration)
when injected into the body, a radioactive tracer enables a nuclear scanner to study the metabolism, distribution, and passage of the agent as it passes through the body.
A distinguishable substance, usually radioactive, administered to determine the distribution and/or metabolism of materials in the body. In 1923, George Hevesy was the first investigator to use an isotope (radioactive thorium) in metabolic studies, exploring lead transport in the bean plant. Metabolic studies proliferated after World War II, when with the development of the cyclotron, radioisotopes of various atoms became more widely available. Isotopes commonly used as tracers today include carbon 14, iodine 131 and phosphorus 32.
(radiology) any radioactive isotope introduced into the body to study metabolism or other biological processes
a natural or artificial substance dissolved in the fluid so that it can be followed in space and time, providing information on the patterns of events
a substance that can be followed through a system, without affecting the performance of the system and its organs, in order to understand how that system works
a substance that can be readily identified, such as an isotope, used to trace the course of a chemical or biological process or determine the size of a space that cannot be directly measured
a substance that carries or emits electromagnetic radiation
A tracer is an element or compound which is administered in some way to organisms so that its path or location may be followed within the organism or in the products of metabolism.
Long-lived chemical compound that can be used to trace the atmospheric airflow.
A small amount of radioactive isotope introduced into a system in order to follow the behavior of some component of that system.
A tracer is a radioactive material that is introduced into a system to make possible the observation of chemical, physical or biological processes in that system.
An identifiable substance, as a dye or radioactive isotope, that can be traced through a mechanical or biological process that provides information on the process. Tracers are often used to detect the rate at which groundwater moves.
An added or injected substance that can be followed within a reaction or an organism, such as radioactive isotopes and certain dyes.
n: a substance added to reservoir fluids to permit the movements of the fluid to be followed or traced. Dyes and radioactive substances are used as tracers in underground water flows and sometimes helium is used in gas. When samples of the water or gas taken some distance from the point of injection reveal signs of the tracer, the route of the fluids can be mapped.
(Traceur) Substance, matter or product which, introduced into a water mass or moving organism, makes possible the study of movement or evolution.(Translated from Glossaire de l'Association européenne pour la promotion de la pêche.)
Means by which something may be followed; for example a radioactive isotope may replace a stable chemical element in a toxic compound enabling the toxicokinetics to be followed. Labelled member of a population used to measure certain properties of that population Gold, Loening, McNaught and Sehmi, 1987
A material that can be distinguished from its normal counterpart by physical means (for instance in the case of FDG this is radioactivity) and can therefore be used to follow (trace) the metabolism of the normal substance
a radioactive atom that can be "traced" or located throughout the body using a device that detects radioactivity.
A substance (such as a radioisotope) used in imaging procedures.
A substance containing a radioactive isotope that is used in nuclear medicine to evaluate chemical processes in the body.
1. A chemical or thermodynamic property of the flow that is conserved during advection. It can be used to track air-parcel movement and to identify the origins of air masses. Examples are absolute humidity, equivalent potential temperature, radioactivity, and CCN composition. 2. Any substance in the atmosphere that can be used to track the history of an air mass. It can be chemical or radioactive in nature. The main requirement for a tracer is that its lifetime be substantially longer than the transport process under study. An example of an inert chemical tracer is SF6, which is often released during a field experiment and measured at a later time to assess the extent of dilution of the air mass. Chemicals such as methane (CH4) and nitrous oxide (N2O), which are released at the earth's surface and destroyed slowly in the atmosphere, can be used to infer vertical rates of transport. CO released in the boundary layer can be used to trace transport in convection. Radioactive tracers such as 14C and 90Sr have been used to test models of stratospheric circulation. Certain atmospheric gases have also been used as tracers in ocean waters, for example, the chlorofluorocarbons.
An atom or group of atoms whose participation in a chemical, physical, or biological reaction can be easilyobserved. Radioisotopes are often used astracers.